CN115161586A

CN115161586A - Method and cooker for arc spraying metal coating

Info

Publication number: CN115161586A
Application number: CN202210749981.4A
Authority: CN
Inventors: 朱泽春; 潘少卿; 徐嘉悦; 李红亮
Original assignee: Joyoung Co Ltd
Current assignee: Joyoung Co Ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-10-11
Anticipated expiration: 2042-06-29
Also published as: CN115161586B

Abstract

The application provides a method for arc spraying a metal coating, which comprises the steps of respectively feeding a titanium metal wire and a stainless steel wire into two conductive channels through a wire feeding roller, respectively carrying charges with opposite positive and negative charges, enabling the titanium metal wire and the stainless steel wire to approach each other to generate an arc heat source to melt the titanium metal wire and the stainless steel wire, and then atomizing and spraying the atomized compressed air onto the surface of a pot blank to form a spraying layer. The fusion-jetting layer on the inner surface of the pot blank is formed by adopting the titanium metal wires and the stainless steel wires through arc fusion-jetting, so that the advantages of two materials are combined, and the corrosion resistance and the wear resistance are both considered; the surface hardness of the formed spray layer is HRC 45-HRC 65, the spray layer can be worn by a turner or a shell food material, the porosity of the spray layer is less than 5%, the corrosion medium is effectively reduced and is transmitted to the interface between the spray layer and a pan blank base material through pores, the phenomenon that the spray layer is peeled off due to oxidation is reduced, and the spray layer has better corrosion resistance.

Description

Method for arc spraying metal coating and cooker

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a method for arc spraying a metal coating and a cooker.

Background

With the rapid development of space science and technology, astronauts can use some kitchen electricity and cooking utensils in space, and the space life quality is improved. Due to the particularity of the space environment, the safety and the qualified use quality of the kitchen appliance and the cooking utensil are particularly important, and the requirements on the kitchen appliance and the cooking utensil are stricter than those under the normal common environment.

The applicant develops a cooking container coating technology for space bin cooking based on space kitchen projects participating in research and development, the cooking requirement of astronauts in space bins is met, the applicant further researches and applies the coating technology to household cooking products, in particular to deep research on household high-temperature cooking appliances, the method for arc spraying the metal coating and the cooker are generated, and the use sanitation of users is improved.

In the cooking utensil of the prior conventional technology, a metal layer, such as a stainless steel spray layer or a titanium metal spray layer, is commonly sprayed on a pot blank substrate to improve the wear resistance of a pot and the bonding force with a non-stick layer, and the spray technology of the prior art is difficult to uniformly spray the spray layer on the inner surface of the pot, so that the quality of the pot is influenced and the coating is easy to fall off; and the wearing resistance of pan has been promoted among the meltallizing technique of prior art, when the pan in long-term culinary art use, still receives the corruption easily, and the corrosion resistance of pan meltallizing layer of prior art remains to promote, and each pan is difficult to compromise pan wear-resisting corrosion resistance and acid resistance.

As is known, the content of heavy metal in stainless steel is too high, and especially the cooking container needs to have stronger acid resistance and friction resistance, and the content of heavy metal in the selected stainless steel is higher, so that the user may ingest more heavy metal components for long-term cooking use, which is not favorable for the food safety of the user. The titanium metal is stable in property and corrosion resistant, and the surface of the metal titanium is covered with a layer of extremely thin naturally generated oxide film titanium and oxide (TiO 2). The film can also be called titanium rust, but different from iron rust, the compact oxide film does not react with nitric acid, dilute sulfuric acid, dilute hydrochloric acid and aqua regia, which is king in acid, at normal temperature, has stable property under most natural conditions and has good corrosion resistance. However, titanium metal has a low heat-resistant temperature, and when it is heated at 650 ℃ or higher, titanium reacts strongly with oxygen, and when it is heated at 700 ℃ or higher, it also reacts with nitrogen, and when it is used in household cooking, for example, the flame temperature of natural gas can be as high as 600-800 ℃, so that in a cooking container, although it has a good corrosion-resistant effect, its high-temperature creep resistance is poor, so that its peeling resistance as a coating is poor.

Disclosure of Invention

The present invention is directed to a method and pot for arc spraying a metal coating, which solves at least one of the problems noted in the background art.

To achieve the above object, the present invention provides a method of arc spraying a metal coating, comprising the steps of:

s1, respectively feeding two different metal wire materials into two conductive channels through a wire feeding roller, and respectively endowing the two different metal wire materials with opposite positive and negative electric properties, wherein one metal wire material is a titanium metal wire or a titanium alloy wire material, and the other metal wire material is a stainless steel wire;

s2, the two metal wires approach to each other under the guidance of the conductive channel until the two metal wires extend out of an outlet of the conductive channel and an electric arc heat source is generated at a preset position to fuse the two metal wires to obtain a molten mixture;

and S3, atomizing the molten mixture of the titanium metal wire and the stainless steel wire by compressed air to form metal fine droplets, and spraying the metal fine droplets to the inner surface of the pot blank by virtue of air flow to form a molten injection layer.

Among the above technical scheme, titanium is as an active metal, can reduce the surface tension who melts the drop, improve the mobility that melts the particle, the coefficient of thermal expansion on meltallizing layer has been reduced, meltallizing in situ stress has been reduced, thereby play and reduce the effect that porosity improves the density, lower porosity can effectively reduce the corrosive medium and transmit pot base substrate interface through the hole, thereby arouse the oxidation to lead to the meltallizing layer to take place to peel off the phenomenon, better corrosion resistance has, adopt titanium metal to combine mixed metal of stainless steel and meltallizing to the meltallizing layer of pot base internal surface formation, have corrosion resistance and wearability concurrently, greatly promoted the life and the quality of use of pan, promote user experience.

Optionally, one of the two metal wires is a titanium metal wire, the other is a stainless steel wire, and the weight ratio of the titanium metal wire to the other metal wire in unit length is 1: (1.5 to 2).

Optionally, the wire feed rate of the titanium wire and the stainless steel wire is equal.

Among the above technical scheme, the send quick-witted rate of two metal silk materials equals to two metal content homoenergetic in the metal melting mixture that makes each time point are equal, thereby make the content of each metal of metal dribble in the injection process equal, and then make everywhere corrosion resistance and the wearability of the meltalling layer on the pot embryo internal surface all can guarantee and balance, promote user's use and experience.

Optionally, the preset position is a vertical distance D between an initial position of the metal fine drop and the inner surface of the pot blank, and the D is 70 to 180mm.

Optionally, the air pressure of the compressed air is 0.5 to 0.8MPa.

Optionally, the meltallizing temperature of the meltallizing is 2800-4350 ℃, and further, the meltallizing temperature of the meltallizing is 4000 ℃ and 4000 ℃, so that the wire is instantly melted, the meltallizing working efficiency is accelerated, and the defect that the wire is not firmly combined with a pot blank base material due to premature solidification is avoided; on the other hand, the hard alloy compound of the titanium, the chromium and the nickel is generated at the spray temperature of 4000 ℃, and the hardness of the spray layer is improved.

In the technical scheme, atomized metal fine drops are conveniently and uniformly sprayed on the inner surface of the pot blank, the metal fine drops are sprayed in a conical shape by compressed air, the spraying distance of 70-180mm ensures that the atomized metal fine drops are diffused in a larger range on one hand, and the metal fine drops are prevented from being accumulated at one position, if the spraying distance is less than 70mm, the metal fine drops are not diffused in time and are easily and quickly accumulated in a small range on the inner surface of the pot blank under the drive of air flow; on the other hand, the phenomenon that the metal fine drops are sprayed out of the inner surface of the pot blank to cause waste due to too far distance is prevented, or the phenomenon that the metal fine drops cannot be sprayed to a required position due to the fact that the metal fine drops are slow down due to too far distance is prevented, if the spraying distance is larger than 180mm, the diffusion area range of the metal fine drops is large, although the molten layer is easy to be uniformly sprayed on the inner surface of the pot blank, the metal fine drops are thin at the moment, long-time spraying is needed, the spraying efficiency is low, the spraying coverage area of the inner surface of the pot blank is not easy to control, and material waste is easy to cause. The spray distance in this application may specifically be 70mm, 80mm, 90 mm, 100mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180mm. The two conductive channels are respectively connected with the anode and the cathode of the power supply, the titanium metal and the stainless steel carry opposite charges when entering the different conductive channels, the conductive channels are divided into front sections and rear sections, the front sections of the two conductive channels are parallel to each other and are respectively connected with the anode and the cathode of the power supply, the distances between the rear sections of the two conductive channels tend to be close to each other, so that the titanium metal wire and the stainless steel wire are guided to be close to each other, the titanium metal wire and the stainless steel wire extend out of the conductive channels and then continue to move forwards along the guiding directions of the rear sections of the two conductive channels until the distance between the titanium metal wire and the stainless steel wire is close enough, an electric arc heat source can be generated and melted.

Optionally, the diameters of the titanium metal wire and the stainless steel wire are equal and are both 2.0mm, the titanium metal wire and the stainless steel wire with the equal diameters enter the conducting channel at a constant speed and are subjected to arc spraying, the volume content balance of the titanium metal wire and the stainless steel wire is ensured, and meanwhile, the spraying time of the metal fine drops is 5-10 seconds, so that a spraying layer with the thickness of 0.2-0.8mm is formed. The meltallizing layer is too thin, which can affect the corrosion resistance and wear resistance of the meltallizing layer, and too thick, which can cause the overall weight of the cookware to be larger, which can affect the user experience, and specifically, the thickness of the meltallizing layer can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm.

Optionally, the outlet of the conductive channel swings along the inner surface of the pot blank, so that the vertical distance between the initial position of the metal fine drop and the inner surface of the pot blank is kept constant, and the metal fine drop is sprayed to cover the whole inner surface of the pot blank.

Among the above technical scheme, because the pot embryo generally includes the pot bottom and the pot lateral wall of arc form, and the pot bottom of current many pans also is the round bottom in order to realize gathering oily effect, consequently when spouting the pan meltallizing layer, if only change the injection direction of metal dribble, can lead to the metal dribble to spout the vertical distance of pot embryo internal surface and change, and then can lead to the apparent uneven of meltallizing layer thickness everywhere of pot embryo internal surface, influence the quality of meltallizing layer.

Optionally, the surface roughness of the meltallizing layer is Ra 5-20 μm. In the technical scheme, the meltallizing layer has certain surface roughness, so that the non-stick layer and the meltallizing layer arranged on the meltallizing layer have good adhesion performance, the meltallizing layer and the non-stick layer can be meshed together in a staggered mode, on the other hand, the surface roughness of the meltallizing layer affects the surface roughness of the inner surface of the pot, and in order to prevent the phenomenon that the cooking or the bacterium breeding remained due to the overlarge surface roughness of the inner surface of the pot, the surface roughness of the meltallizing layer is not suitable to be overlarge. The fusion-jetting layer formed by the special components has good bonding property with the non-stick layer, and the surface roughness is Ra 5-20 mu m. Specifically, in the present application, the surface roughness value of the thermal spray layer may be Ra5 μm, ra6 μm, ra7 μm, ra8 μm, ra9 μm, ra10 μm, ra11 μm, ra12 μm, ra13 μm, ra14 μm, ra15 μm, ra16 μm, ra17 μm, ra18 μm, ra19 μm, ra20 μm. .

Optionally, the surface hardness of the spray layer is HRC 45-HRC 65. The surface hardness can withstand the abrasion of a turner or a shell food material, the porosity of the meltallizing layer is less than 5%, the corrosive medium is effectively reduced and transmitted to the interface of the meltallizing layer and a pot blank base material through pores, and the phenomenon of spalling of the meltallizing layer caused by oxidation is reduced, so that the corrosion resistance is better.

Optionally, the method for arc spraying a metal coating further includes performing surface pretreatment on the inner surface of the pot blank, where the surface pretreatment includes the following steps:

a. surface oil removal treatment: polishing the inner surface of the pot blank to remove the oiliness of the inner surface of the pot blank, or spraying a solvent to remove oil;

b. surface roughening treatment: and roughening the inner surface of the pot blank by adopting a polygonal grinding material to form a rough inner surface of the pot blank, wherein the surface roughness of the rough inner surface is Ra 5-20 mu m.

The inner surface of the pot blank is subjected to surface pretreatment, and then the fusion-jetting layer is sprayed, so that the binding force between the fusion-jetting layer and the inner surface of the pot blank is improved.

The invention also discloses a cooker, the method for spraying the metal coating by the electric arc is adopted to spray the inner surface of the cooker blank to form a spraying layer, and the spraying layer is also provided with a non-stick layer mixed with zinc oxide.

Optionally, the non-stick layer comprises a bottom coating and a top coating arranged on the bottom coating, the zinc oxide is distributed on the top coating, and the mass percentage of the zinc oxide in the top coating is 0.5-2%.

In the technical scheme, the zinc oxide is mixed in the surface coating, and the zinc oxide releases zinc ions to destroy and kill bacterial cells, so that the effects of sterilization and antibiosis are achieved. The mass percent of zinc oxide in the surface coating is 0.5 to 2 percent, and the antibacterial and non-stick effects are both considered.

The invention also provides a coating test method of a cooking container, wherein the cooking container is provided with a container substrate, at least the inner surface of the container substrate is adhered with a meltallizing layer, and the meltallizing layer is an alloy composition; adhering a non-stick layer to the inner surface of the meltallizing layer, wherein the non-stick layer is an organic polymer, and can be specifically fluororesin; the coating test method of the cooking container comprises the following steps: performing material bonding test on the container substrate attached with the meltallizing layer; carrying out an acid resistance test on the container matrix attached with the meltallizing layer; carrying out a wear resistance test on the container substrate attached with the meltallizing layer; and carrying out corrosion resistance test on the container substrate attached with the non-stick layer.

Optionally, the performing a material bonding test on the container substrate attached with the meltallizing layer includes: the meltallizing layer is formed by covering the meltallizing raw material of the alloy composition on the inner surface of the container matrix in a multi-layer thermal spraying manner, and the thickness of the meltallizing layer is 0.2 to 0.8mm; and cutting the cooking container into a sample with a set area, observing the section structure and the structure of the sample by using a metallographic microscope, and judging whether the structure combination between the meltallizing layer and the container substrate is positive or not.

Optionally, after the cooking container is cut into a sample with a set area, the sample is mechanically ground, polished and corroded, and then the cross-section structure and the structure of the sample are observed by using a metallographic microscope.

The samples with the above set areas were: a15 mm by 25mm sample was cut out in the transverse direction from the pot blank to which the sprayed layer was sprayed.

Optionally, the determining whether the tissue bonding between the meltallizing layer and the container substrate is normal includes observing whether the tissue of the meltallizing layer is uniform and the structural compactness; observing whether the pores of the meltallizing layer are uniform and whether the pore distribution is coherent; and observing whether the fusion-jetting layer and the container base body are compact and have no crack.

Optionally, the vessel base to which the meltblowing layer is attached is subjected to an acid resistance test comprising: and (3) filling acetic acid solution into the cooking container, wherein the filling amount is 1/3 to 2/3 of the volume of the cooking container, closing a heating source after boiling, standing, and observing whether the inner surface of the cooking container is discolored or not.

Further, an acetic acid solution with the volume content of 4.5% -5.5% is filled into the cooking container, the filling amount is 1/3-2/3 of the volume of the cooking container, after the heating source is boiled, the heating source is closed, the cooking container is kept still for 12 hours or more, and whether the inner surface of the cooking container is discolored or not is observed.

The amount of acetic acid in the acetic acid solution may be 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5.0%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5% by volume, and the cooking vessel may have an unacceptable corrosion resistance if a visually observable color change occurs on the interior surface of the cooking vessel.

Optionally, the container substrate to which the meltallized layer is attached is subjected to a wear test comprising: applying 1.3 kg to 1.7 kg of acting force to the steel wire balls by using a manipulator, circularly rubbing the inner surfaces of the cooking containers by using the steel wire balls under the acting force, putting eggs into the positions where the steel wire balls rub the cooking containers for cooking, and observing whether pan sticking occurs or not.

Further, the steel wire balls rub the inner surface of the cooking container in a back-and-forth circulating manner, and the steel wire balls are replaced once every 1 ten thousand cycles, and are circulated for 5 ten thousand cycles; the frequency of the steel wire ball to rub the inner surface of the cooking container back and forth in a circulating manner is 55 to 65 times/min, and the movement distance of the back and forth in the circulating manner is 95 to 105mm.

In the application, the frequency of the steel wire ball to rub the inner surface of the cooking container back and forth in a circulating manner is 60 times/min, and the movement distance of the back and forth circulation is 100mm. And (3) putting eggs into the place where the steel wire balls rub the cooking container for cooking, and if the phenomenon of pot sticking occurs, indicating that the wear resistance of the cooking container is not qualified.

Optionally, the vessel base body to which the non-stick layer is attached is subjected to a corrosion resistance test comprising: and (3) filling the saline water into the cooking container, boiling the saline water firstly, keeping a slightly boiling state, then closing the heating source, standing the container, and observing whether the inner surface of the cooking container bulges or not.

Further, the corrosion resistance test comprises: and (3) filling the saline water with the mass content of 4.5-5.5% into the cooking container, boiling, keeping the slightly boiling state for 6.5-7.5 hours, then closing the heating source, standing for 16 hours or more, and observing whether the inner surface of the cooking container bulges or not.

The invention also provides a cookware, wherein the surface of the cookware substrate is attached with a spray layer, the spray layer is an alloy composition, the alloy composition is formed by spraying metal wires made of different materials, the spray layer is provided with a main spray surface positioned in the center of the cookware, and the thickness of the spray layer on the main spray surface is 0.2mm to 0.8mm; the alloy composition comprises, by mass, 5.43% -9.87% of chromium, 4.35% -13.4% of nickel, 0.54% -2.9% of molybdenum, 54.2% -63.71% of titanium, and the balance of iron and unavoidable impurities.

In the present invention, the numerical value of the titanium content in percentage by mass may be 54.20%, 54.60%, 55.00%, 55.50%, 55.83%, 55.90%, 56.00%, 56.15%, 56.25%, 56.70%, 57.00%, 57.50%, 57.68%, 58.00%, 59.00%, 60.00%, 61.00%, 62.00%, 63.13%, 63.54%, 63.71%; the numerical value of the mass ratio content of chromium may be 5.43%, 5.70%, 5.93%, 6%, 6.43%, 6.52%, 6.75%, 6.88%, 6.93%, 7%, 7.43%, 7.70%, 7.93%, 8%, 8.43%, 8.7%, 8.75%, 8.93%, 9%, 9.06%, 9.43%, 9.65%, 9.87%; the mass ratio content of nickel may be 4.35%, 4.5%, 5%, 5.5%, 5.8%, 6%, 6.5%, 6.52%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.14%, 10.5%, 10.87%, 11%, 11.5%, 12%, 12.5%, 13%, 13.4%; the numerical value of the mass ratio content of molybdenum may be 0.54%, 0.75%, 1%, 1.09%, 1.25%, 1.45%/1.5%, 1.75%, 2%, 2.25%, 2.5%, 2.54%, 2.75%, 2.9%.

The alloy composition is used as a spray layer of a cooking container, and the alloy composition contains titanium metal in a selected mass ratio, so that the spray layer formed by the alloy composition has the stability of the metal titanium, an oxide film titanium and oxide (TiO 2) are naturally generated on the surface of the metal titanium, and the alloy composition does not react with nitric acid, dilute sulfuric acid, dilute hydrochloric acid and aqua regia at normal temperature, has excellent acid resistance and has good corrosion resistance.

Meanwhile, compared with pure titanium metal, the alloy composition also contains other elements, and hard phases Cr7C3 and Cr23C7 with high hardness are generated by chromium and carbon in the alloy composition and are dispersed and distributed in a solid solution strengthened spray layer to play a role in precipitation hardening and improve the wear resistance of the surface of the cookware substrate. However, grain boundary precipitation of chromium carbide causes a decrease in corrosion resistance, and the alloy composition obtained by blending the carbon content, chromium content and other elements according to the present invention has high strength and good corrosion resistance, and can effectively improve the abrasion resistance and scratch resistance of the sprayed layer. Further, chromium is a ferrite forming agent, and an increase in the chromium content is not favorable for the stability of the austenitic structure although it can improve the corrosion resistance of the sprayed layer, and the sprayed layer having strong corrosion resistance and a stable austenitic structure can be obtained by blending the chromium content of the present invention with other metal elements and their contents.

The nickel content of the alloy composition can maintain high strength, high wear resistance and low corrosion rate of a molten layer in an active state.

In the present application, molybdenum can improve the corrosion resistance of stainless steel, which can strengthen the matrix of stainless steel and improve the high temperature strength and creep properties of stainless steel.

In addition, the alloy composition forms a spray layer through spraying, and metal is inevitably oxidized to form metal oxide during spraying, so that the sprayed spray layer contains trace metal oxide, such as chromium and chromium oxide, nickel and nickel oxide, molybdenum and molybdenum oxide, iron and iron oxide in the alloy. And the grain of part of the metal oxide is coarse and high in strength, the existence of trace metal oxide improves the strength of the spray layer, and the spray layer is not easy to scratch and wear due to the improvement of the strength. As for the content control of the metal oxide, the content of the metal oxide obtained by controlling without intentionally doping oxygen can be satisfied by the amount of the oxide inevitably generated by the meltallizing process.

This application is on titanium metal's basis, other elements of the aforesaid have been added, the material hardness on meltallizing layer has effectively been promoted, and in the culinary art in-process, the meltallizing layer need endure the high temperature of flame, and stand the lasting stir-fry of time, boil, stew, cook technology such as evaporate, in the culinary art in-process, the metal material on meltallizing layer of this application is at constant temperature, the long-term effect of constant load is down, effective resistance produces plastic deformation, avoid the technological effect of material high temperature creep, the high temperature compression creep of material, and high temperature tensile creep all effectively promote, instant long-time use, the meltallizing layer is also difficult for the fracture, the bubble, or peel off.

Optionally, the alloy composition includes 6.52% -9.06% chromium, 5.8% -10.87% nickel, 1.09% -2.54% molybdenum, and 54.2% -63.54% titanium, with the balance being iron and unavoidable impurities.

Optionally, the alloy composition includes 6.88% -8.7% of chromium, 6.52% -10.14% of nickel, 1.45% -2.54% of molybdenum, and 56.25% -63.54% of titanium, with the balance being iron and unavoidable impurities.

Optionally, the alloy composition further comprises 0.02% to 1.09% by mass of copper.

In the present invention, the content of copper may be 0.02%, 0.15%, 0.2%, 0.22%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.55%, 0.6%, 0.65%, 0.7%, 0.72%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.09% by mass.

Optionally, the alloy composition includes 0.22% to 0.72% copper by mass%. The chromium, nickel and molybdenum content of the alloy composition can be passivated even in a reducing environment such as sulfuric acid and formic acid by being matched with copper element, so that the corrosion resistance of the alloy composition in acetic acid is improved. The chromium content and the nickel content in the alloy composition are matched with copper, so that the alloy composition has strong acid resistance, particularly has high resistance to chloride interstitial corrosion and stress corrosion cracking, is not easy to generate corrosion spots and cracks, and has strong pitting corrosion resistance.

Optionally, the alloy composition further includes, in mass%, 0.64% to 5.74% aluminum and 1.28% to 3.83% vanadium. The aluminum is added on the basis of titanium, so that the alpha phase of titanium metal can be stabilized, and the aluminum-containing composite material has obvious effects of improving the normal-temperature and high-temperature strength of a spray layer, reducing the specific gravity and increasing the elastic modulus; meanwhile, a certain amount of vanadium is added, so that the performances of wear resistance, strength, hardness, ductility and the like of the meltallizing layer can be further improved.

In the present invention, the amount of aluminum may be 0.64%, 1.28%, 1.91%, 2.23%, 2.55%, 2.87%, 3.19%, 3.51%, 3.83%, 4.30%, 4.46%, 5%, 5.5% by mass; the vanadium content may be 0%, 2.00%, 2.23%, 2.55%, 2.87%, 3.00%, 3.19% by mass.

Optionally, the alloy composition further includes, in mass%, 3.51% to 4.3% aluminum and 2.23% to 2.87% vanadium.

Optionally, the container base is selected from at least one of iron, iron alloy, aluminum alloy, copper and copper alloy materials; the melting and jetting raw material is selected from at least two of iron alloy, stainless steel, titanium alloy and titanium metal.

Preferably, the container substrate is made of an aluminum-silicon-magnesium alloy material, and the meltallizing raw materials are stainless steel and titanium metal.

Optionally, the pot base has a bottom wall and a side wall, and the thickness of the bottom wall is 2.5mm-6mm; the main spraying surface completely covers the surface of the bottom wall, and the ratio of the thickness of the bottom wall to the thickness of the spray layer of the main spraying surface is 3.2-30.

The excessively small thickness of the meltallizing layer can cause the wear resistance and corrosion resistance of the meltallizing layer to be reduced, the excessively large thickness of the meltallizing layer can cause the overweight of the pan body, and the thickness values of the meltallizing layer in the application can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm and 0.8mm; the thickness of the bottom wall may be 2.5mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4.0 mm, 4.1 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5.0 mm, 5.2 mm, 5.4 mm, 5.5 mm, 6mm; the ratio of the bottom wall thickness to the primary spray face melt-injection layer thickness may be 3.2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30.

Further, the thickness of the bottom wall is preferably 5mm, the thickness of the injection layer on the main injection surface is preferably 0.5mm, and the ratio of the thickness of the bottom wall to the thickness of the injection layer on the main injection surface is 10.

Main flour of spouting is located the pan center in this application, and the pan center is more than the culinary art containers such as pans if the pot wall or other internal surfaces, with slice or eat material, oil, vinegar etc. contact, therefore mainly spout the setting of face and further strengthen the wear-resisting acid-resisting and corrosion resisting property at pan center.

Optionally, the meltallizing layer at least adheres to the internal surface of pan base member, the internal surface of container base member form with the attached face that the meltallizing layer combined together, the surface of meltallizing layer is the culinary art face.

Optionally, the meltallizing layer is at least attached to the inner surface of the cookware base, at least one non-stick layer is attached to the surface of the meltallizing layer, and the surface of the non-stick layer is a cooking surface.

Optionally, zinc oxide is mixed in the non-stick layer forming the cooking surface, and the mass percentage of the zinc oxide is 0.5 to 2%. The zinc oxide may be, specifically, 0.5%, 0.7%, 0.9%, 1.0%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2.0% by mass.

Optionally, the non-stick coating comprises a primer coating and a top coating disposed on the primer coating, and the zinc oxide is distributed on the top coating.

In the technical scheme, the zinc oxide is mixed in the surface coating, and the zinc oxide releases zinc ions to destroy and kill bacterial cells, so that the effects of sterilization and antibiosis are achieved. The mass percent of the zinc oxide in the top coating is 0.5 to 2 percent, and the antibacterial and non-stick effects are both considered.

Optionally, the surface roughness of the meltallizing layer formed by meltallizing the metal wires made of different materials is less than the surface roughness of the meltallizing layer formed by meltallizing the metal wires made of single stainless steel, and the surface roughness of the meltallizing layer formed by meltallizing the metal wires made of different materials is Ra 5-20 μm.

In the technical scheme, the meltallizing layer has certain surface roughness, so that the non-stick layer and the meltallizing layer arranged on the meltallizing layer have good adhesion performance, the meltallizing layer and the non-stick layer can be meshed together in a staggered way, on the other hand, the surface roughness of the meltallizing layer influences the surface roughness of the inner surface of the pot, and the surface roughness of the meltallizing layer is not suitable to be overlarge in order to prevent the overlarge surface roughness of the inner surface of the pot from influencing cooking or residual breeding bacteria. The meltallizing layer formed by the special components has better bonding property with the non-stick layer, and the surface roughness is Ra 5-20 mu m. Specifically, in the present application, the surface roughness value of the thermal spray layer may be Ra5 μm, ra6 μm, ra7 μm, ra8 μm, ra9 μm, ra10 μm, ra11 μm, ra12 μm, ra13 μm, ra14 μm, ra15 μm, ra16 μm, ra17 μm, ra18 μm, ra19 μm, ra20 μm.

Optionally, the surface hardness of the spray layer is HRC 45-HRC 65. The surface hardness can withstand the abrasion of turner or shell food materials, the porosity of the spray layer is less than 5%, the corrosion medium is effectively reduced and is transmitted to the interface between the spray layer and a pan blank base material through pores, the phenomenon that the spray layer is peeled off due to oxidation is reduced, and the corrosion resistance is better.

Compared with the prior art, the invention has the beneficial effects that:

1. the method adopts titanium metal wires and stainless steel wires to form a spray layer on the inner surface of a pot blank through electric arc spraying, integrates the advantages of two materials, and has both corrosion resistance and wear resistance; the surface hardness of the formed spray layer is HRC 45-HRC 65, the spray layer can be worn by a turner or a shell food material, the porosity of the spray layer is less than 5%, the corrosion medium is effectively reduced and is transmitted to the interface between the spray layer and a pan blank base material through pores, the phenomenon that the spray layer is peeled off due to oxidation is reduced, and the spray layer has better corrosion resistance.

2. The titanium metal wire and the stainless steel wire are melted and sprayed in real time at a preset distance from the inner surface of the pot blank, so that a certain amount of heat is kept when the fusion injection layer is sprayed on the inner surface of the pot blank, the pot blank is heated through the heat, the bonding force between the inner surface of the pot blank and the fusion injection layer is stronger, and the fusion injection layer is uniformly distributed on the inner surface of the pot blank due to the constant spraying distance.

3. The wire feeding roller is adopted to feed the titanium metal wire and the rotten steel wire at a constant speed, and the content of the titanium metal wire and the content of the rotten steel wire are controlled to be consistent all the time, so that the uniformity of the content of each material of the spray layer is ensured, and the quality of the spray layer is improved.

4. The application contains zinc oxide in the top coating, can play antibacterial effect of disinfecting to the pan surface, guarantee user safety in utilization.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram showing an arc spraying process of the present invention;

FIG. 2 is a schematic view of a process for forming a thermal spraying layer on a pot blank according to the present invention;

FIG. 3 is a schematic cross-sectional view of the pot of the present invention;

FIG. 4 is a comparison of the cooking container of the invention of example four and the non-stick pan of the comparative example after acid resistance testing, respectively;

fig. 5 is a schematic view of a cooking container of the present invention after being subjected to a wear resistance test in the fifth embodiment;

FIG. 6 is a schematic representation of comparative example 1 of example five after being subjected to the abrasion resistance test;

FIG. 7 is a schematic representation of comparative example 2 of example five after abrasion resistance testing;

fig. 8 is a schematic view of a cooking vessel of the present invention in a sixth example after being subjected to a corrosion resistance test;

FIG. 9 is a schematic representation of comparative example 1 of example six after corrosion resistance testing;

fig. 10 is a schematic diagram of comparative example 2 in example six after corrosion resistance testing.

Description of reference numerals:

1. a pot blank; 2. A meltallizing layer; 3. a wire feeding roller; 4. a conductive path; 5. and (4) no adhesion layer.

Detailed Description

In order to more clearly explain the overall concept of the present invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

The first embodiment is as follows:

as shown in fig. 1 and 2, the present embodiment provides a method for arc spraying a metal coating, comprising the steps of:

s1, two different metal wire materials are respectively fed into two conductive channels 4 through a wire feeding roller 3 and are respectively endowed with opposite positive and negative electric properties, wherein one metal wire material is a titanium metal wire, and the other metal wire material is a stainless steel wire;

s2, the titanium wire and the stainless steel wire approach to each other under the guidance of the conductive channel 4 until the titanium wire and the stainless steel wire extend out of an outlet of the conductive channel 4 and generate an electric arc heat source at a preset position to fuse the titanium wire and the stainless steel wire to obtain a fused mixture;

and S3, atomizing the molten mixture of the titanium metal wire and the stainless steel wire by compressed air to form metal fine droplets, and spraying the metal fine droplets to the inner surface of the pot blank 1 by virtue of air flow to form a molten injection layer 2.

The titanium metal wire and the stainless steel wire enter the two conductive channels 4 in parallel under the drive of the wire feeding roller 3 and are endowed with opposite positive and negative electric properties, then extend out from the outlet of the conductive channel 4 under the guide of the conductive channel 4 and move continuously towards the approaching direction of the two metals, when the two metals with opposite electric properties continuously approach to a preset distance, an electric arc heat source is generated between the two metals and melts the two metals, and then the molten metal mixture is atomized and sprayed to the inner surface of the pot blank 1 under the action of compressed air.

The two conductive channels 4 are respectively connected with the positive electrode and the negative electrode of the power supply, when titanium metal and stainless steel enter the different conductive channels 4, the titanium metal and the stainless steel carry opposite charges, the conductive channels 4 are divided into front sections and rear sections, the front sections of the two conductive channels 4 are parallel to each other and are respectively connected with the positive electrode and the negative electrode of the power supply, the distances between the rear sections of the two conductive channels 4 tend to approach each other, so that the titanium metal wire and the stainless steel wire are guided to approach each other, the titanium metal wire and the stainless steel wire extend out of the conductive channels 4 and then continue to move forwards along the guiding directions of the rear sections of the two conductive channels 4 until the distance between the titanium metal wire and the stainless steel wire is close enough, an arc heat source can be generated and the two metals can be melted.

Further, the weight ratio of the titanium metal wire to the stainless steel wire in unit length is 1: (1.5-2) to ensure the volume balance of the titanium metal and the stainless steel material in the spray process, so that the titanium metal and the stainless steel in the spray layer 2 are balanced, and the corrosion resistance and the wear resistance of the spray layer 2 of the cookware are considered at the same time. Specifically, the weight ratio of the titanium metal wire to the stainless steel wire in the unit length is selected from the following components of 1.5, 1, 1.76 and 1.

In this example, the weight ratio of the titanium wire to the stainless steel wire per unit length was 1:1.76, because the density of the titanium metal is lower than that of the stainless steel, when the weight ratio of the titanium metal wire to the stainless steel wire in unit length is 1:1.76 the time, the volume of titanium metal silk and stainless steel wire raw materials is the same for titanium metal is close as far as possible with the volume content of stainless steel in the metal dribble, and then makes titanium be the same with the volume content of stainless steel in the meltallizing layer 2, thereby the corrosion resistance and the wearability of balanced meltallizing layer 2, and because the less characteristic of the density of titanium metal, make meltallizing layer 2 weight less, alleviateed the whole weight of pan simultaneously.

Further, the speed that send of titanium wire and stainless steel wire equals to can stable control titanium wire and the electric charge amount that stainless steel wire was given in electrically conductive channel 4, make electric charge amount stable and the size of both equal, thereby further stable control electric arc meltallizing, let titanium metal and stainless steel wire evenly melt.

Furthermore, the diameters of the titanium metal wire and the stainless steel wire are equal and are both 2.0mm, the titanium metal wire and the unbroken steel wire with the equal diameters enter the conductive channel 4 at a constant speed and are subjected to arc meltallizing, the balance of the volume contents of the titanium metal wire and the unbroken steel wire is ensured, and meanwhile, the spraying time of the metal fine drops ranges from 5 to 10 seconds, so that the meltallizing layer 2 with the thickness ranging from 0.2 to 0.8mm is formed. The excessively thin meltallizing layer 2 can lead to its corrosion-resistant and wear-resistant performance being influenced, and too thick can lead to the whole weight of pan great, influences user experience, and specifically, the thickness of meltallizing layer 2 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm.

Furthermore, the vertical distance D between the initial position of the metal fine drop and the inner surface of the pot blank 1 is 70 to 180mm, the initial position is the position where the titanium wire and the stainless steel wire extend out of the outlet of the conductive channel 4 and are fused by the generated arc heat source, and then the metal fine drop is formed by atomization under the action of compressed air and is sprayed to the inner surface of the pot blank 1 under the drive of air flow.

The spraying distance of 70 to 180mm ensures that the atomized metal droplets can be diffused in a larger range on one hand, and one part of the atomized metal droplets is prevented from being accumulated, if the spraying distance is less than 70mm, the metal droplets are not diffused in time under the drive of air flow and are easy to be accumulated on the inner surface of the pot blank 1 in a smaller range and faster; on the other hand, the phenomenon that the metal fine drops are sprayed out of the inner surface of the pot blank 1 to cause waste due to too far distance is prevented, or the phenomenon that the metal fine drops are sprayed out of the inner surface of the pot blank 1 to cause the speed of the metal fine drops to slow down and cannot be sprayed to a required position due to too far distance and limited opening area of the pot itself is prevented, if the spraying distance is larger than 180mm, the diffusion area range of the metal fine drops is large, although the melting layer 2 is easy to be uniformly sprayed on the inner surface of the pot blank 1, the metal fine drops are thin at the moment, long-time spraying is needed, the spraying efficiency is low, the spraying coverage area of the inner surface of the pot blank 1 is not easy to control, and material waste is easy to cause. The ejection distance in this embodiment may be specifically 70mm, 80mm, 90 mm, 100mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180mm.

Further, the outlet of the conductive channel 4 swings along the inner surface of the pot blank 1, so that the vertical distance between the initial position of the metal fine drop and the inner surface of the pot blank 1 is kept constant, and the metal fine drop is sprayed to cover the whole inner surface of the pot blank 1. That is, the spraying distance of the metal droplets is kept constant, because the pot blank 1 generally comprises a pot bottom and an arc-shaped pot side wall, and the pot bottoms of many existing pots are also round bottoms to achieve the oil gathering effect, so that when the pot melt-ejecting layer 2 is sprayed, if only the spraying direction of the metal droplets is changed, the vertical distance of the metal droplets sprayed to the inner surface of the pot blank 1 is changed, and further the thickness of the melt-ejecting layer 2 at each position of the inner surface of the pot blank 1 is obviously uneven, which affects the quality of the melt-ejecting layer 2.

The spraying distance is kept constant so that the molten sprayed layer 2 is sprayed on the inner surface of the pot blank 1 as uniformly as possible. It should be explained that, because the air flow drives the metal droplets to be sprayed to the inner surface of the pot blank 1 in a conical manner, the spraying distances of the metal droplets are different, but the vertical distance between the initial position of the metal droplets and the inner surface of the pot blank 1 is still constant, the tiny difference of the microscopic unevenness of the spray layer 2 caused by conical spraying can be ignored, and the spraying unevenness caused by the change of the vertical distance between the initial position of the metal droplets and the inner surface of the pot blank 1 is more obvious and can not be ignored.

Further, the pressure of the compressed air is 0.5 to 0.8MPa.

Further, the spray current was 80 to 140A.

Furthermore, the surface roughness of the spray layer 2 is Ra 5-20 μm, and the surface hardness of the spray layer 2 is HRC 45-HRC 65.

Further, the method for arc spraying a metal coating of the present invention further comprises a surface pretreatment of the inner surface of the pot blank 1, the surface pretreatment comprising the steps of:

a. surface oil removal treatment: polishing the inner surface of the pot blank 1 to remove the oiliness on the inner surface of the pot blank 1, or spraying a solvent to remove oil;

b. surface roughening treatment: the inner surface of the pot blank 1 is roughened by adopting a polygonal grinding material to form a rough inner surface of the pot blank 1, and the surface roughness of the rough inner surface is Ra 5-20 mu m.

The surface roughness of the inner surface of the pot blank 1 after surface treatment is Ra 25-20 mu m, the pot blank has obvious rough feeling, and the bonding strength between the pot blank 1 after surface oil removal treatment and surface roughening treatment and the meltallizing layer 2 can be effectively improved to form stronger mechanical embedding.

The pot blank 1 can be formed by drawing, die-casting or forging, the pot blank 1 of the embodiment is formed by drawing aluminum, the pot blank 1 is further provided with a composite bottom sheet, and the composite bottom sheet with magnetic conductivity is strongly pressed into the bottom of the pot blank 1 by cold riveting and using a 2500T oil press.

After the meltallizing is finished, a15 mm multiplied by 25mm sample is transversely cut from the pot blank 1 sprayed with the meltallizing layer 2, the sample is mechanically ground, polished and corroded in sequence, and a metallographic microscope is used for observing the structural structure of the cross section of the sample, so that the meltallizing layer 2 is tightly combined with the pot blank 1, and no cracking phenomenon is caused. Certain smelting binding points exist between the meltallizing layer 2 and the pot blank 1, and the binding strength is high.

The microstructure diagram of the spray layer 2 shows that the structure of the spray layer 2 is uniform and compact, no larger pores are seen, the distribution of the spray layer 2 is in a non-coherent state, and the porosity of the spray layer 2 is less than 5% measured by an image analysis method, because titanium is an active metal, the surface tension of molten drops can be reduced, the fluidity of molten particles is improved, the mutual wetting between the particles and the pot blank 1 and between the particles is also improved, the thermal expansion coefficient of the spray layer 2 is reduced, the internal stress is reduced, the effect of reducing the porosity and improving the density is achieved, the lower porosity can effectively reduce the transmission of corrosive media to the interface between the spray layer 2 and the pot blank base material through the pores, the phenomenon that the spray layer 2 is peeled off due to oxidation is reduced, and the corrosion resistance is better.

The second embodiment:

as shown in fig. 3, this embodiment provides a pot, the method of arc spraying a metal coating in the first embodiment is adopted to spray a sprayed layer 2 on the inner surface of a pot blank 1, and a non-stick layer 5 mixed with zinc oxide is further disposed on the sprayed layer 2.

In this embodiment, the non-stick layer 5 includes a primer layer and a top coat layer disposed on the primer layer, the zinc oxide is distributed on the top coat layer, and the mass percentage of the zinc oxide in the top coat layer is 0.5 to 2%.

The surface coating mixed with zinc oxide dissolves metal zinc ions to resist bacteria, namely, the zinc oxide slowly releases the zinc ions in a water-containing medium to destroy and kill cells, thereby achieving the aims of sterilization and antibiosis. The zinc oxide in this embodiment is mixed tetrapod-like zinc oxide, and because of tetrapod-like zinc oxide has needle-like active center and tip effect, can activate water and oxygen in the air, produce hydroxyl free radical and active oxygen ion, carry out effectual sterilization and antibiotic, especially under the moist state, promoted the antibiotic degerming effect of top coat greatly, promoted the safe in utilization health and hygiene of pan

Example three:

the embodiment provides a cooking container, which comprises a cookware substrate, wherein a spray layer is attached to the surface of the cookware substrate, the spray layer is an alloy composition, the alloy composition is formed by spraying metal wires made of different materials in a melting way, the spray layer is provided with a main spray surface positioned in the center of a cookware, and the thickness of the spray layer on the main spray surface is 0.2mm to 0.8mm; the alloy composition comprises, by mass, 5.43% -9.87% of chromium, 4.35% -13.4% of nickel, 0.54% -2.9% of molybdenum, 54.2% -63.71% of titanium, and the balance of iron and unavoidable impurities.

Further, the pot base body is provided with a bottom wall and a side wall, and the thickness of the bottom wall is 2.5mm-6mm; the main spraying surface completely covers the surface of the bottom wall, and the ratio of the thickness of the bottom wall to the thickness of the spray layer of the main spraying surface is 3.2-30.

Furthermore, the meltallizing layer is at least attached to the inner surface of the cookware base, the inner surface of the container base forms an attaching surface combined with the meltallizing layer, and the surface of the meltallizing layer is a cooking surface; or the meltallizing layer is at least attached to the inner surface of the cookware base body, at least one non-stick layer is attached to the surface of the meltallizing layer, and the surface of the non-stick layer is a cooking surface.

The alloy composition is formed by the thermal spraying of metal wires of different materials, the thermal spraying raw materials of the metal wires of different materials are provided, and the thermal spraying raw materials of the metal wires of different materials are simultaneously thermal sprayed on the surface of the base body of the cooking container to form the thermal spraying layer.

Further, the alloy composition comprises 6.52% -9.06% of chromium, 5.8% -10.87% of nickel, 1.09% -2.54% of molybdenum, 54.2% -63.54% of titanium, and the balance of iron and inevitable impurities.

Further, the alloy composition comprises 6.88% -8.7% of chromium, 6.52% -10.14% of nickel, 1.45% -2.54% of molybdenum, 56.25% -63.54% of titanium, and the balance of iron and inevitable impurities.

Further, the alloy composition further comprises 0.02% -1.09% of copper by mass%.

Further, the alloy composition further comprises 0.22% -0.72% by mass of copper.

Further, the alloy composition further comprises 0.64% -5.74% of aluminum and 1.28% -3.83% of vanadium by mass%.

Further, the alloy composition further comprises 3.51% -4.3% of aluminum and 2.23% -2.87% of vanadium by mass%.

Further, the container base is selected from at least one of iron, iron alloy, aluminum alloy, copper and copper alloy materials; the melting and jetting raw material is selected from at least two of ferroalloy, stainless steel, titanium alloy and titanium metal; the container substrate is made of an aluminum-silicon-magnesium alloy material, and the meltallizing raw materials are stainless steel and titanium metal.

The surface roughness of the spray layer is Ra 5-20 mu m, the thickness of the spray layer is uniformly sprayed on the inner surface of the cookware base body, and the surface hardness of the spray layer is HRC 45-HRC 65.

Further, the method for testing the material bonding property of the container substrate attached with the meltallizing layer comprises the following steps: the meltallizing layer is formed by covering the meltallizing raw material of the alloy composition on the inner surface of the container matrix in a multi-layer thermal spraying manner, and the thickness of the meltallizing layer is 0.2 to 0.8mm; and cutting the cooking container into a sample with a set area, observing the section structure and the structure of the sample by using a metallographic microscope, and judging whether the structure combination between the meltallizing layer and the container substrate is normal or not.

And cutting a15 mm multiplied by 25mm sample of the pot blank sprayed with the meltallizing layer along the transverse direction, mechanically grinding, polishing and corroding the sample in sequence, and observing the structural structure of the section of the sample by using a metallographic microscope to find that the meltallizing layer is tightly combined with the pot blank and has no cracking phenomenon. Certain smelting joint points exist between the meltallizing layer and the pot blank, and the bonding strength is higher.

The microstructure diagram of the meltallizing layer shows that the structure of the meltallizing layer is uniform and compact, no larger pores are seen, the distribution of the meltallizing layer is in a non-coherent state, the porosity of the meltallizing layer is measured by an image analysis method to be less than 5%, and the meltallizing layer and a container matrix are tightly not cracked, because titanium is an active metal, the surface tension of molten drops can be reduced, the fluidity of molten particles is improved, the mutual wetting among particles, a pot blank and the particles is improved, the thermal expansion coefficient of the meltallizing layer is reduced, the internal stress is reduced, the porosity is reduced, the density is improved, the effect of reducing the porosity is achieved, the density is improved, the corrosion medium can be effectively reduced from being transmitted to the interface between the meltallizing layer and the pot blank base material through pores, the phenomenon that the meltallizing layer is peeled off due to oxidation is reduced, and the corrosion resistance is better.

Example four:

the embodiment provides an acid resistance testing method, wherein a plurality of cooking containers with process conditions meeting the third embodiment are randomly selected to be respectively tested for multiple times:

after the cooking container of the third embodiment is cleaned and naturally dried, the acetic acid solution with the volume content of 5% is filled into the cooking container, the filling amount is about 3/5 of the volume of the cooking container, the heating cooking container is heated to boil the acetic acid solution, the boiling state is kept for ten minutes, then the heat source is closed, and the cooking container is kept still for 12 hours. After standing still, the acetic acid solution in the cooking container is spread and washed to observe whether the inner wall of the cooking container is discolored.

Comparative example: the non-stick pan made of the conventional meltallizing layer material on the market is used as a comparative example, the manufacturing process of the non-stick pan is consistent with that of the cooking container in the third embodiment, only the component content of the meltallizing layer is different, the colors of the inner surface of the non-stick pan and the inner surface of the cooking container in the third embodiment are similar to each other visually under the initial state, and a plurality of non-stick pans are respectively tested for multiple times under the same acid resistance test conditions.

As shown in fig. 4, the pot body at the upper position in fig. 4 is an anti-stick pot in the comparative example, and the pot body at the lower position in fig. 4 is a cooking container in the third example. From the results of multiple tests, the inner surface of the non-stick pan with the conventional melt-ejecting layer on the market undergoes obvious yellowing visible to naked eyes after the acid resistance test, and the inner surface of the cooking container in the third example is consistent with that before the acid resistance test. That is, the cooking container in example three has acid resistance exceeding the non-stick pan in comparative example.

Example five:

the embodiment provides a wear-resistant testing method, wherein a plurality of cooking containers with various process conditions meeting the third embodiment are randomly selected to be tested for multiple times respectively:

applying 1.3 kg to 1.7 kg acting force to the steel wire balls by using a manipulator, circularly rubbing the inner surface of the cooking container in the third embodiment by using the steel wire balls under the acting force, circularly rubbing the inner surface of the cooking container back and forth, and replacing the steel wire balls once every 1 million times, wherein 5 million times of circulation are performed; the frequency of the steel wire ball to rub the inner surface of the cooking container back and forth in a circulating manner is 55 to 65 times/min, and the movement distance of the back and forth in the circulating manner is 95 to 105mm. And (4) putting eggs into the place where the steel wire balls rub the cooking container for cooking, and observing whether a pan sticking phenomenon occurs or not.

In the embodiment, a manipulator is adopted to apply 1.5 kg of acting force to the steel wire ball, the frequency of back-and-forth cyclic rubbing of the steel wire ball on the inner surface of the cooking container is 60 times/min, and the back-and-forth cyclic movement distance is 100mm. As shown in fig. 5, the cooking container of the third embodiment still has good non-stick effect.

Comparative example 1: the non-stick pan made of the conventional melting-spraying layer material on the market is used as a comparative example, the manufacturing process of the non-stick pan is the same as that of the cooking container in the third embodiment, only the component content of the melting-spraying layer is different, and the non-stick pan with the process condition is tested for multiple times by using the same wear-resisting test condition. As shown in fig. 6, the non-stick pan of the comparative example was severely stuck after the abrasion resistance test.

Comparative example 2: the non-stick pan with the spray layer containing titanium by mass% of more than 63.77% is used, and in this embodiment, specifically, the non-stick pan with the spray layer containing titanium by mass ratio of 70%, 75%, 80% is taken as an example to perform a plurality of tests, and the plurality of non-stick pans under the process condition are tested by using the same wear resistance test conditions. As shown in fig. 7, the non-stick pan of the comparative example was severely stuck after the abrasion resistance test.

In the embodiment, after the steel wire balls are circularly rubbed on the inner surface of the pot, scratches inevitably occur on the inner surface of the pot, and the non-stick layer is also inevitably damaged.

According to the results of multiple tests, the cooking container in the third embodiment has the advantages that due to the combination of the special meltallizing layer and the non-stick layer, the non-stick layer and the meltallizing layer of the cooking container still keep the non-stick effect after being damaged to a certain extent, namely, the cooking container has good wear resistance; the non-stick pan in the comparative examples 1 and 2 has a pan sticking phenomenon, i.e., the non-stick layer and the spray layer are seriously damaged, resulting in poor non-stick property, i.e., poor wear resistance.

Example six:

the embodiment provides a corrosion resistance testing method, wherein a plurality of cooking containers with various process conditions meeting the third embodiment are randomly selected to be respectively tested for multiple times:

the saline water with the mass content of 5% is filled into the cooking container in the third embodiment, the filling amount is about 3/5 of the volume of the cooking container, the slightly boiling state is kept for 7 hours after boiling, then the heating source is closed, the cooking container is kept still for 16 hours, and whether the inner surface of the cooking container bulges or not is observed. As shown in fig. 8, the inner surface of the cooking container in the third example was maintained in the state before the corrosion resistance test, and no bulge was generated.

Comparative example 1: the non-stick pan made of the conventional meltallizing layer material on the market is used as a comparative example, the manufacturing process of the non-stick pan is the same as that of the cooking container in the third embodiment, only the component content of the meltallizing layer is different, and after the same corrosion resistance test conditions are used for respectively carrying out multiple tests on a plurality of non-stick pans, the phenomenon that the surfaces in the pans bulge is observed. As shown in fig. 9, the non-stick pan of this comparative example exhibited significant bulging after the corrosion resistance test.

Comparative example 2: the nonstick pan with the spray layer containing less than 55.83% of titanium by mass is used, and in this embodiment, specifically, the nonstick pan with the spray layer containing 45%, 40%, 35% of titanium by mass is used as an example to perform multiple tests on the nonstick pan respectively under the same corrosion resistance test conditions. As shown in fig. 10, the non-stick pan of this comparative example exhibited significant bulging after the corrosion resistance test.

The corrosion resistance of the cooking container in the third embodiment and the non-stick pan in the comparative examples 1 and 2 is tested by brine, and as shown by the results of multiple tests, the brine in the corrosion resistance test in the third embodiment partially seeps through the non-stick layer in the comparative examples 1 and 2 and swells due to corrosion of the meltdown layer under the test conditions, while the cooking container in the third embodiment is subjected to the test without swelling, and the corrosion resistance is obviously higher than that of the non-stick pan in the comparative examples 1 and 2.

The cooking container subjected to the test does not generally have the problems of corrosion, abrasion, acid corrosion and the like in the daily use process. And above each test condition all comparatively severer, can distinguish the performance of conventional non-stick pan and the non-stick pan of the different meltallizing layer of component content and cooking container in this application. Through the test, the cooking container in this application acid resistance, wearability, corrosion resistance all obviously are superior to the non-stick pan in the comparative example in this application, possess more outstanding performance.

The technical solutions protected by the present invention are not limited to the above embodiments, and it should be noted that the combination of the technical solution of any one embodiment and the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A method of arc spraying a metal coating comprising the steps of:

2. A method according to claim 1, wherein one of the two metal wires is a titanium metal wire and the other is a stainless steel wire, the weight ratio of the titanium metal wire to the stainless steel wire per unit length being 1: (1.5 to 2).

3. The method of arc spraying a metal coating of claim 2, wherein the titanium wire and the stainless steel wire are fed at the same rate.

4. The method of claim 1, wherein the preset position is a vertical distance D between an initial position of the metal fine drop and the inner surface of the pot blank, and D is 70-180mm.

5. The method of claim 3, wherein the outlet of the conductive path is oscillated along the inner surface of the pot blank to maintain a constant vertical distance between the initial position of the metal droplet and the inner surface of the pot blank and to spray the metal droplet to cover the entire inner surface of the pot blank.

6. The method of claim 1, wherein the compressed air pressure is 0.5 to 0.8mpa.

7. The method of claim 1, wherein the surface roughness of the spray layer is Ra 5-20 μm, the thickness of the spray layer is 0.2-0.8 mm, or the surface hardness of the spray layer is HRC 45-HRC 65.

8. The method of arc spraying a metal coating as claimed in claim 1, further comprising surface pre-treating the inner surface of the pot blank, said surface pre-treating comprising the steps of:

surface oil removal treatment: polishing the inner surface of the pot blank to remove the oiliness of the inner surface of the pot blank, or spraying a solvent to remove oil;

surface roughening treatment: and roughening the inner surface of the pot blank by adopting a polygonal grinding material to form a rough inner surface of the pot blank, wherein the surface roughness of the rough inner surface is Ra 5-20 mu m.

9. A cookware, characterized in that a spray layer is formed on the inner surface of a pot blank by adopting the method of arc spraying metal coating according to any one of claims 1 to 8, and the spray layer is also provided with a non-stick layer mixed with zinc oxide.

10. The cookware according to claim 9, wherein the non-stick layer comprises a bottom coating and a top coating arranged on the bottom coating, the zinc oxide is distributed on the top coating, and the mass percentage of the zinc oxide in the top coating is 0.5-2%.