CN105132907A - Surface treatment process for eye joint of brake pipe - Google Patents
Surface treatment process for eye joint of brake pipe Download PDFInfo
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- CN105132907A CN105132907A CN201510571141.3A CN201510571141A CN105132907A CN 105132907 A CN105132907 A CN 105132907A CN 201510571141 A CN201510571141 A CN 201510571141A CN 105132907 A CN105132907 A CN 105132907A
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Abstract
The invention relates to a surface treatment process for an eye joint of a brake pipe. The surface treatment process comprises the steps that a base material is subjected to pretreatment; a protecting layer is formed on the base material; the protecting layer is a zinc layer, and the thickness of the zinc layer is 6-15 micrometers; a passive film layer is formed on the protecting layer; a sealing film layer is formed on the passive film layer. According to the surface treatment process, after the surface treatment is conducted on the eye joint of the brake pipe, the eye joint of the brake pipe is more attractive, the performance such as medium resistance, oxidation resistance and corrosion resistance is better, and the service life is longer.
Description
Technical field
The present invention relates to a kind of process of surface treatment of joint, particularly relate to a kind of process of surface treatment of brake pipe eye joint.
Background technology
Along with national economy continue, fast-developing, improving constantly of living standards of the people, since two thousand two China's Automobile Market there occurs great variety.Private Car Consumption market especially blowout increases.In the face of day by day fierce market competition, safer, the efficient automobile component of the continuous research and development that automobile component part supply business is also growing with each passing hour.
Wherein, brake system of car is related to the safety of car load and occupant and the reliable vitals travelled, and includes brake pipe eye joint in breaking system.And the erosion resistance, wear resistance etc. of brake pipe eye joint of the prior art have to be strengthened.
In prior art, often before plating, skimming treatment is thorough, the phenomenon generation such as therefore easily cause coating to bubble, to come off, and constrains the development of hot dip galvanizing process.And the present invention's further preferred surface grease treatment process comprises electrochemical deoiling technique, ultrasonic oil removing operation, electrolytic degreasing operation.Make substrate surface pass through repeatedly to carry out oil removing degreasing by different way, thoroughly effectively can remove Vegetable oil lipoprotein and the animal grease of substrate surface, thoroughly solve existing issue.
As preferably, surface activation process operation preferred concentration is that the hydrochloric acid of 10-20% carries out, and the time is 10-20s.
As preferably, surperficial preimpregnation operation is preferably carried out in basic solution, and basic solution preferred concentration is the NaOH of 30-50g/L, and the time is 2-10s.
Compared with prior art, the present invention has following advantage:
1. the base material of brake pipe eye joint of the present invention has carried out surface treatment, and base material defines protective layer, makes brake pipe eye joint more attractive in appearance, and media-resistant, resistance to oxidation, the performance such as corrosion-resistant are better, and work-ing life is more of a specified duration.
2. the appropriate thickness of protective layer of the present invention, and same product surface thickness deviation is little, aesthetics and corrosionproof protection effect better.
3. the present invention is formed with certain thickness passivation film on the protection layer, and passivation film comprises the first passivation film and the second passivation film, not only can significantly improve the barrier propterty of zinc coating, can also improve decorative appearance.
4. the present invention is also formed with even, organized closed rete on passivation film, and closed rete comprises the first closed rete and the second closed rete, improves the bright property of brake pipe eye joint, planarization, final erosion resistance and Anti-tarnishing ability.
5. protective layer zinc layers of the present invention adopts galvanizing flux hot dip to form, and galvanizing flux forms through reasonable compatibility, has outstanding covering power and high deposition rate, and the zinc coating of acquisition has good ductility, sticking power and luminance brightness.
Summary of the invention
The object of the invention is for the above-mentioned problems in the prior art, propose a kind of process of surface treatment that can ensure the brake pipe eye joint that erosion resistance, wear resistance and work-ing life are of a specified duration.
Object of the present invention realizes by following technical proposal: a kind of process of surface treatment of brake pipe eye joint, and this process of surface treatment is:
Base material is carried out pre-treatment;
Be formed at by protective layer on base material, described protective layer is zinc layers, and thickness is 6-15 μm; With
Passivation film is formed on protective layer; With
Closed rete is formed on passivation film.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, the thickness of protective layer is 8-13 μm.
The base material of the present invention to brake pipe eye joint has carried out surface treatment, and base material defines protective layer, and protective layer is zinc layers, plays the effects such as attractive in appearance, corrosion-resistant.And the thickness of protective layer is 6-15 μm, more preferably 10-15 μm, and ensure that the thickness deviation of same base material up-protective layer is ± 1 μm.The thickness of protective layer and erosion resistance strong or weak relation are very large, and protective layer is too thin, and work-ing life is short; Protective layer is too thick, there will be protective layer thickness unavoidably uneven, and especially the protective layer of bending part, interface and protective layer thickness tolerance around it are comparatively large, now, after the place that protective layer is thin is corroded and punctures, can accelerate corrosion speed, reduction of service life.Therefore, the present invention not only wants the thickness of Control protection layer, also will control the thickness deviation of same base material up-protective layer, thus play effective provide protection.In addition, along with the thickening of protective layer, its surface-area is corresponding increasing thereupon, and the protective layer of deposition increases, and the solution taken out of with base material increases, and the consumption of the energy strengthens simultaneously; And protective layer is blocked up, surfaceness improves, and cleaning quality reduces, and the solution of surface adsorption is difficult to clean up, thus mutual pollution between plating solution namely can be caused to wait series of problems, improves production cost.Therefore, be also formed with passivation film and closed rete in conjunction with the present invention at protective layer, consider in conjunction with actual erosion rate and the aspect such as work-ing life, cost, when being controlled within the scope of the present invention by protective layer thickness, effect is better.
The present invention is also formed with passivation film on the protection layer, not only can significantly improve the barrier propterty of zinc coating, can also improve decorative appearance.Because protective layer is zinc layers, zinc is a kind of amphoteric metal, and in general environment, corrosion speed is about 0.3 μm/year, but is subject to the impact of the environments for use such as humidity, and its corrosion speed can reach 5.3 μm/year, greatly shortens work-ing life.And after the passivation film that formative tissue is fine and close in zinc layers, erosion resistance is strong, passivation film sticks to zinc layers surface securely, makes zinc layers and environment for use completely cut off, and slow down the corrosion of environment for use to zinc layers.The grey white point (corrosion product) that just has the brake pipe eye connector assembly 2-3 month of unpassivated process produces, and coating blackening.And the brake pipe eye joint after Passivation Treatment that quality is similar, thickness is identical just has the generation of grey white point for about 2 years, therefore, after Passivation Treatment, resistance to corrosion can improve about 10 times.
In addition, the present invention is also formed with even, organized closed rete on passivation film.Closed rete has the excellent feature such as bright property, planarization, Anti-tarnishing, erosion resistance, makes the final erosion resistance of brake pipe eye joint of the present invention improve more than 2 times, and Anti-tarnishing ability improves nearly more than 20 times.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, passivation film comprises the first passivation film and the second passivation film, and the second passivation film is formed on the first passivation film.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, the thickness of the first passivation film and the second passivation film is 0.1-0.5 μm, total thickness≤0.6 μm of passivation film.
As preferably, the first passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315 (Ke Wenteya process for treating surface company limited, hereinafter referred to as Ke Wenteya): 80-100ml/L; Passivation temperature is 35-45 DEG C, pH:2.0-2.5, and the time is 40-60s.
As preferably, the second passivation film is formed in the second passivating solution, and the composition of the second passivating solution and concentration are: FINIDIP145 (Ke Wenteya): 80-100ml/L; Passivation temperature is: 20-30 DEG C, pH:2.2-2.8, and the time is 25-30s.
Because passivation film of the present invention is great on the corrosion resistance nature impact that brake pipe eye joint is final, therefore, the present invention does not adopt the form of single passivation film, but passivation film is divided into the first passivation film and the second passivation film, and the first passivation film is different with the composition of the second passivation film.When being formed at after the second passivation film on the first passivation film surface is damaged; zinc layers also has the first passivation film protection; and can not directly etching zinc layers, avoid single passivation film in prior art be damaged after zinc layers face the danger of corrosion, directly enhance work-ing life.But, the quantity of passivation film can not be increased simply, because, passivation film quantity increases, and the thickness of passivation film also can increase thereupon, although do not have the passivation film thickness of standard and the passivation film thickness of recommendation in prior art, but, passivation film is blocked up, and bonding force will reduce, and passivation film easily comes off, therefore, the present invention not only will control the thickness of individual layer passivation film, also will control the total thickness of passivation film, to ensure sticking power and the practicality of passivation film.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, closed rete comprises first and closes rete and the second closed rete, and first closes rete is formed on the second passive film, and second closes rete is formed on the first closed rete.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, the first thickness closing rete and the second closed rete is 0.1-0.3 μm, closes total thickness≤0.5 μm of rete.
As preferably, first closes rete is formed in the first encapsulant, and the composition of the first encapsulant and concentration are: FINIGARD460 (Ke Wenteya): 10-15%, and temperature is 40-50 DEG C, pH is 8.8-10, and the time is 25-35s.
As preferably, second closes rete is formed in the second encapsulant, and the composition of the second encapsulant and concentration are: FINIGARD460 (Ke Wenteya): 8-12%; Temperature is 40-50 DEG C, pH is 8.8-10, and the time is 25-35s.
In like manner, the present invention does not adopt the form of single closed rete yet, is divided into by closed rete first to close rete and second equally and closes rete.Close second on rete surface close after rete is damaged when being formed at first, also have first to close rete protection, improve work-ing life.In like manner, close rete blocked up, bonding force also can reduce, closed rete easily comes off, and therefore, the present invention not only will control the thickness of single layer of encapsulation rete, also to control the total thickness of closed rete, affect result of use to ensure closed rete in use can not come off easily.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, zinc layers adopts galvanizing flux hot dip to form, galvanizing flux is formulated primarily of following composition (in unit volume plating solution addition): Zn:5-9g/L, NaOH:100-150g/L, walk agent: 6-10ml/L, brightening agent: 0.5-2ml/L, scavenging agent: 8-15ml/L, coordination agent: 5-15g/L.
Zinc layers of the present invention adopts galvanizing flux hot dip to form, and galvanizing flux of the present invention forms through reasonable compatibility, have outstanding covering power and high deposition rate, the zinc coating of acquisition has good ductility, sticking power and luminance brightness, improves the attractive in appearance and corrosion resistance of goods.And compared with alkaline zinc plating of the prior art, galvanizing flux of the present invention can not produce pungent taste when hot dip, and production environment is improved greatly.
Galvanizing flux better performances of the present invention is stronger to impurity susceptibility.If too much containing beavy metal impurity in galvanizing flux, the chance producing corrosion galvanic cell is more, and coating erosion resistance is poorer.Therefore, the present invention directly provides zine ion by Metal Zn when dosing, and do not adopt of the prior art by ZnO to provide the technical scheme of zine ion.Not only can reduce the generation of beavy metal impurity, also avoid the coating obtained in new dosing is dark-coloured phenomenon, improves quality and the erosion resistance of zinc layers.In addition, because zine ion is the main component in plating solution, when its content is higher, allow the current density used to improve, sedimentation velocity is accelerated, but coating easily occurs areas of high current density burns phenomenon, coating is comparatively coarse, dispersive ability and covering power poor; When content is lower, allow the current density of use lower, sedimentation velocity is comparatively slow, is difficult to the galvanized layer thickness obtaining needs, but dispersive ability and covering power are better, so need the content of conservative control zinc.
Too much, the unholiness quality that all can reduce zinc coating of galvanizing flux of impurity in galvanizing flux.The present invention, in order to solve this defect, also added coordination agent while the addition improving scavenging agent.Scavenging agent can remove the impurity in plating solution, eliminates coating and sends out mist, have also been enlarged the luminance brightness of low voltage simultaneously, and avoid high-voltage to burn, to prevent under high electric current operating condition coating fragility and come off.And coordination agent can form coordination ion and stable existence with metal ion, avoid metal ion and NaOH to form precipitation of hydroxide, detrimentally affect is produced to plating solution and coating.
In galvanizing flux of the present invention, NaOH is the complexing agent of zine ion, and can also promote the conductive capability of anode dissolution and raising plating solution, therefore, the impact of content on plating solution and coating of NaOH is very large.NaOH too high levels, although bath stability, dispersive ability and covering power better, but the cathode efficiency of plating solution is lower, and content is too low, although solution dispersibility and covering power poor, but the cathode efficiency of plating solution is higher, so the content of NaOH needs strict control equally.
The present invention is also added with walk agent and brightening agent in galvanizing flux.Brightening agent can significantly improve zinc coating luminance brightness and low level voltage sedimentation velocity, can reduce high-voltage sedimentation velocity, thus improves dispersive ability and the covering power of plating solution.But, if the content of brightening agent is too much, the problem generation being mingled with brightening agent and too much causing solidity to corrosion to be deteriorated can be caused in zinc coating.Therefore, the present invention by walk agent and brightening agent with the use of, the consumption of brightening agent can be controlled, while ensureing the erosion resistance of zinc coating, also can improve the luminance brightness of low-voltage area, make coating reach even bright degree, the internal stress of zinc coating can also be reduced.
As preferably, coordination agent is EDETATE DISODIUM or Seignette salt.Preferably coordination agent is Seignette salt further, because Seignette salt cost and result of use are all better than EDETATE DISODIUM.
As preferably, the agent that walks, brightening agent and scavenging agent are the one in the commercially available conventional agent that walks, brightening agent and scavenging agent.But scavenging agent of the present invention is more preferably CK778, because in the processing performance of existing zincincation initial period plating solution, quality of coating etc. are all pretty good, but along with the prolongation of production time, processing performance is then faded, and then is difficult to plate out qualified product.And occur that the major cause of this phenomenon is the maintenance of plating solution, particularly the purifying method of plating solution and means fail to obtain due solution, and the agent of CK778 alkaline zinc plating liquid comprehensive purifying can well solve this phenomenon.
In the process of surface treatment of above-mentioned a kind of brake pipe eye joint, in hot galvanizing process, cathode current density is 0.5-2A/dm
2, temperature is 20-26 DEG C, and the time is 40-70min.
In the present invention, temperature and cathodic current on pot galvanize impact all very greatly, must strictly control.When temperature is too high, permission cathode current density is large, sedimentation velocity fast, but cathode efficiency is on the low side, and depletion of additive is fast, and plating solution instability easily causes quality of coating to degenerate.And temperature on the low side time, allow to use cathode current density little, sedimentation velocity is slow, if now adopt higher cathodic current concentration operation, in coating, additive is mingled with and increases, and fragility increases, and coating color, foaming time serious, even come off.And distance in the selection of cathode current density and plating solution between the content of zine ion, the height of temperature, the quality of additive and content, anode and cathode and whether take movable cathode relevant.Zinc ion concentration is high, bath temperature is high.Anode cathode separation is large, addition of cathode moving device, and just allow to adopt higher cathode current density, now sedimentation velocity is fast, production efficiency is high, coating light evenly, otherwise on the contrary.Therefore, cathode current density and bath temperature not only can affect quality of coating separately, and, in both, arbitrary condition control is improper, capital affects the quality of final coating, so cathode current density and temperature all must seriously control in above-mentioned scope in galvanizing process of the present invention, arbitrary condition can not be had to exceed above-mentioned scope.
In above-mentioned process of surface treatment, base material pretreatment process in early stage at least includes surperficial grease treatment process, surface activation process operation and surperficial preimpregnation operation.
As preferably, surperficial grease treatment process comprise in electrochemical deoiling technique, ultrasonic oil removing operation, electrolytic degreasing operation one or more.
Wherein, the composition of the solution of electrochemical deoiling operation and concentration are: Presol1700:70-90ml/L (Ke Wenteya); Temperature is 50-70 DEG C, and the time is 10-15min.
Composition and the concentration of the solution of ultrasonic oil removing operation are: COVENPREP121 (Ke Wenteya): 15-30g/L; Temperature is 50-70 DEG C, and the time is 5-6min.
Electrolytic degreasing operation comprises just end electrolytic degreasing operation and terminal electrolytic degreasing operation.Composition and the concentration of the electrolytic solution of first end electrolytic degreasing operation are: Presol7061 (Ke Wenteya): 70-90g/L; The current density of electrolysis is 1-5A/dm
2, electrolysis temperature is 50-70 DEG C, and electrolysis time is 5-6min.The composition of terminal electrolyte and concentration are: Presol7061 (Ke Wenteya): 50-70g/L, and the current density of electrolysis is 1-5A/dm
2, electrolysis temperature is 50-70 DEG C, and electrolysis time is 5-6min.
As preferably, just carry out one or many washing, each flow 160-200L/h, time 2-10s after end electrolytic degreasing operation.Carry out pickling 10-15min after washing, pickling preferred concentration is the chlorohydric acid pickling of 25-35%.One or many washing is carried out again, each flow 160-200L/h, time 2-10s after pickling.Carry out terminal electrolytic degreasing operation more afterwards.By increasing pickling process in electrolytic degreasing operation, to remove the rusty stain etc. of substrate surface.
In process of surface treatment of the present invention, substrate surface first carries out pre-treatment, with the grease of suitable condition removal substrate surface, dirt and zone of oxidation etc., impels surface coarsening even, carrys out receive sediments to obtain good sticking power with clean base material.Substrate surface pre-treatment is improper, and quality of coating can be caused to be deteriorated, and coating adhesion and erosion resistance reduce.
Accompanying drawing explanation
Fig. 1 is the structural representation of brake pipe eye joint of the present invention.
Embodiment
Be below specific embodiments of the invention, and accompanying drawings is further described technical scheme of the present invention, but the present invention is not limited to these embodiments.
As shown in Figure 1, brake pipe eye joint of the present invention comprises body 1, one end of body 1 is provided with termination 3, the other end of body 1 is provided with eye termination 2.
Following examples brake pipe eye joint blank preferably adopts iron material to make.
Table 1: the main component of embodiment 1-5 galvanizing flux and concentration thereof
Embodiment 1:
The brake pipe eye joint blank made by iron material first carries out electrochemical deoiling and ultrasonic oil removing, and the composition of the solution of electrochemical deoiling and concentration are: Presol1700:70ml/L; The temperature of electrochemical deoiling is 50 DEG C, and the time is 10min.The composition of the solution of ultrasonic oil removing and concentration are: COVENPREP121:15g/L; The temperature of ultrasonic oil removing is 50 DEG C, and the time is 5min.Then enter just end electrolyzer to carry out just holding electrolysis, composition and the concentration of first end electrolyte are: Presol7061:70g/L; The current density of electrolysis is 1A/dm
2, electrolysis temperature is 50 DEG C, and electrolysis time is 5min.Once wash after first end electrolysis, flow 200L/h, time 10s.Adopt after washing concentration be 25% hydrochloric acid carry out pickling 10min.Once wash again after pickling, flow 200L/h, time 10s.Water washed rear blank enters terminal electrolyzer and carries out terminal electrolysis treatment, and the composition of terminal electrolyte and concentration are: Presol7061:50g/L; The current density of electrolysis is 1A/dm
2, electrolysis temperature is 50 DEG C, and electrolysis time is 5min.Again once wash after terminal electrolysis, flow 200L/h, time 10s.Adopt after washing concentration be 10% hydrochloric acid activate, soak time is 10s.Activation terminates rear pure water and once washes, flow 200L/h, time 10s.Be preimpregnation 10s in the NaOH basic solution of 30g/L afterwards in concentration by blank, complete whole preprocessing process.
Pretreated blank will be completed and carry out pot galvanize formation zinc layers, the galvanizing flux of pot galvanize is prepared by embodiment in table 11, coordination agent is Seignette salt, and scavenging agent is more preferably CK778, and walk agent and brightening agent are all the commercially available conventional one walked in agent and brightening agent.In galvanizing process, cathode current density is 0.5A/dm
2, bath temperature is 20 DEG C, and electroplating time is 40min.
First washed by blank after zinc-plated completing, washing is divided into general washing and ultrasonic washing, flow 200L/h, time 10s during general washing; The time 5min of ultrasonic washing.Adopt concentration to be 3ml/L, pH after washing to be the salpeter solution of 0.5 to carry out bright dipping, the time is 15s.After bright dipping, blank is once washed, flow 200L/h, time 10s.Carry out passivation after washing, passivation is divided into be carried out for twice, forms the first passivation film and the second passivation film respectively.First passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315:80ml/L; Passivation temperature is 35 DEG C, pH:2.0, and the time is 40s.After a passivation terminates, once wash with pure water, flow 200L/h, time 10s.Then in the second passivating solution, carry out secondary passivity form the second passivation film, the composition of the second passivating solution and concentration are: FINIDIP145:80ml/L; Passivation temperature is: 20 DEG C, pH:2.2, and the time is 25s.After secondary passivity terminates, wash equally with pure water, washing is divided into general washing and exchanges washing, and each flow is 200L/h, time 10s.And then carry out hot water wash and close, the composition of the solution of hot water wash and concentration are: FINIGARD205A:4%; The temperature of hot water wash is 40 DEG C, and pH is 11.0, and the time is 25s.Close to be divided into and carry out for twice, form first respectively and close rete and the second closed rete, first closes rete is formed in the first encapsulant, second closes rete is formed in the second encapsulant, the composition of the first encapsulant and concentration are: FINIGARD460:10%, and the composition of the second encapsulant and concentration are: FINIGARD460:8%; The temperature of the first encapsulant and the second encapsulant is 40 DEG C, and pH is 8.8, and the time is 25s.Last oven dry at 50 DEG C after room temperature environment leeward cuts 5min can obtain end article brake pipe eye joint.
Embodiment 2:
The brake pipe eye joint blank made by iron material first carries out electrochemical deoiling and ultrasonic oil removing, and the composition of the solution of electrochemical deoiling and concentration are: Presol1700:75ml/L; The temperature of electrochemical deoiling is 55 DEG C, and the time is 12min.The composition of the solution of ultrasonic oil removing and concentration are: COVENPREP121:18g/L; The temperature of ultrasonic oil removing is 55 DEG C, and the time is 6min.Then enter just end electrolyzer to carry out just holding electrolysis, composition and the concentration of first end electrolyte are: Presol7061:75g/L; The current density of electrolysis is 2A/dm
2, electrolysis temperature is 55 DEG C, and electrolysis time is 5min.Once wash after first end electrolysis, flow 200L/h, time 10s.Adopt after washing concentration be 28% hydrochloric acid carry out pickling 12min.Twice washing is carried out again, each flow 180L/h, time 5s after pickling.Water washed rear blank enters terminal electrolyzer and carries out terminal electrolysis treatment, and the composition of terminal electrolyte and concentration are: Presol7061:55g/L; The current density of electrolysis is 2A/dm
2, electrolysis temperature is 55 DEG C, and electrolysis time is 5min.Three washings are again carried out, each flow 165L/h, time 8s after terminal electrolysis.Adopt after washing concentration be 15% hydrochloric acid activate, soak time is 12s.Activation terminates rear pure water and carries out twice washing, each flow 170L/h, time 6s.Be preimpregnation 8s in the NaOH basic solution of 35g/L afterwards in concentration by blank, complete whole preprocessing process.
Pretreated blank will be completed and carry out pot galvanize formation zinc layers, the galvanizing flux of pot galvanize is prepared by embodiment in table 12, coordination agent is Seignette salt, and scavenging agent is more preferably CK778, and walk agent and brightening agent are all the commercially available conventional one walked in agent and brightening agent.In galvanizing process, cathode current density is 1A/dm
2, bath temperature is 22 DEG C, and electroplating time is 50min.
First washed by blank after zinc-plated completing, washing is divided into general washing and ultrasonic washing, flow 190L/h, time 8s during general washing; The time 6min of ultrasonic washing.Adopt concentration to be 4ml/L, pH after washing to be the salpeter solution of 1 to carry out bright dipping, the time is 12s.After bright dipping, blank carries out the washing of twice, each flow 170L/h, time 4s.Carry out passivation after washing, passivation is divided into be carried out for twice, forms the first passivation film and the second passivation film respectively.First passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315:85ml/L; Passivation temperature is 38 DEG C, pH:2.2, and the time is 45s.After a passivation terminates, once wash with pure water, flow 185L/h, time 8s.Then in the second passivating solution, carry out secondary passivity form the second passivation film, the composition of the second passivating solution and concentration are: FINIDIP145:85ml/L; Passivation temperature is: 22 DEG C, pH:2.5, and the time is 26s.After secondary passivity terminates, wash equally with pure water, washing is divided into general washing and exchanges washing, and each flow is 180L/h, time 8s.And then carry out hot water wash and close, the composition of the solution of hot water wash and concentration are: FINIGARD205A:5%; The temperature of hot water wash is 45 DEG C, and pH is 11.1, and the time is 26s.Close to be divided into and carry out for twice, form first respectively and close rete and the second closed rete, first closes rete is formed in the first encapsulant, second closes rete is formed in the second encapsulant, the composition of the first encapsulant and concentration are: FINIGARD460:12%, and the composition of the second encapsulant and concentration are: FINIGARD460:9%; The temperature of the first encapsulant and the second encapsulant is 43 DEG C, and pH is 9, and the time is 26s.Last oven dry at 58 DEG C after room temperature environment leeward cuts 6min can obtain end article brake pipe eye joint.
Embodiment 3:
The brake pipe eye joint blank made by iron material first carries out electrochemical deoiling and ultrasonic oil removing, and the composition of the solution of electrochemical deoiling and concentration are: Presol1700:80ml/L; The temperature of electrochemical deoiling is 60 DEG C, and the time is 13min.The composition of the solution of ultrasonic oil removing and concentration are: COVENPREP121:20g/L; The temperature of ultrasonic oil removing is 60 DEG C, and the time is 5min.Then enter just end electrolyzer to carry out just holding electrolysis, composition and the concentration of first end electrolyte are: Presol7061:80g/L; The current density of electrolysis is 3A/dm
2, electrolysis temperature is 60 DEG C, and electrolysis time is 6min.Twice washing is carried out, each flow 160L/h, time 10s after first end electrolysis.Adopt after washing concentration be 30% hydrochloric acid carry out pickling 13min.Once wash again after pickling, flow 200L/h, time 10s.Water washed rear blank enters terminal electrolyzer and carries out terminal electrolysis treatment, and the composition of terminal electrolyte and concentration are: Presol7061:60g/L; The current density of electrolysis is 3A/dm
2, electrolysis temperature is 60 DEG C, and electrolysis time is 6min.Again twice washing is carried out, each flow 170L/h, time 7s after terminal electrolysis.Adopt after washing concentration be 15% hydrochloric acid activate, soak time is 15s.Activation terminates rear pure water and carries out three washings, each flow 160L/h, time 2s.Be preimpregnation 6s in the NaOH basic solution of 40g/L afterwards in concentration by blank, complete whole preprocessing process.
Pretreated blank will be completed and carry out pot galvanize formation zinc layers, the galvanizing flux of pot galvanize is prepared by embodiment in table 13, coordination agent is Seignette salt, and scavenging agent is more preferably CK778, and walk agent and brightening agent are all the commercially available conventional one walked in agent and brightening agent.In galvanizing process, cathode current density is 1.5A/dm
2, bath temperature is 24 DEG C, and electroplating time is 50min.
First washed by blank after zinc-plated completing, washing is divided into general washing and ultrasonic washing, each flow 165L/h, time 6s during general washing; The time 5min of ultrasonic washing.Adopt concentration to be 4ml/L, pH after washing to be the salpeter solution of 1.5 to carry out bright dipping, the time is 13s.After bright dipping, blank is once washed, flow 200L/h, time 10s.Carry out passivation after washing, passivation is divided into be carried out for twice, forms the first passivation film and the second passivation film respectively.First passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315:90ml/L; Passivation temperature is 40 DEG C, pH:2.3, and the time is 50s.After a passivation terminates, carry out twice washing with pure water, each flow 175L/h, time 4s.Then in the second passivating solution, carry out secondary passivity form the second passivation film, the composition of the second passivating solution and concentration are: FINIDIP145:90ml/L; Passivation temperature is: 26 DEG C, pH:2.5, and the time is 28s.After secondary passivity terminates, wash equally with pure water, washing is divided into general washing and exchanges washing, and each flow is 180L/h, time 4s.And then carry out hot water wash and close, the composition of the solution of hot water wash and concentration are: FINIGARD205A:8%; The temperature of hot water wash is 50 DEG C, and pH is 11.5, and the time is 30s.Close to be divided into and carry out for twice, form first respectively and close rete and the second closed rete, first closes rete is formed in the first encapsulant, second closes rete is formed in the second encapsulant, the composition of the first encapsulant and concentration are: FINIGARD460:14%, and the composition of the second encapsulant and concentration are: FINIGARD460:11%; The temperature of the first encapsulant and the second encapsulant is 46 DEG C, and pH is 9.5, and the time is 32s.Last oven dry at 60 DEG C after room temperature environment leeward cuts 5min can obtain end article brake pipe eye joint.
Embodiment 4:
The brake pipe eye joint blank made by iron material first carries out electrochemical deoiling and ultrasonic oil removing, and the composition of the solution of electrochemical deoiling and concentration are: Presol1700:85ml/L; The temperature of electrochemical deoiling is 65 DEG C, and the time is 14min.The composition of the solution of ultrasonic oil removing and concentration are: COVENPREP121:28g/L; The temperature of ultrasonic oil removing is 65 DEG C, and the time is 5min.Then enter just end electrolyzer to carry out just holding electrolysis, composition and the concentration of first end electrolyte are: Presol7061:85g/L; The current density of electrolysis is 4A/dm
2, electrolysis temperature is 65 DEG C, and electrolysis time is 6min.Three washings are carried out, each flow 160L/h, time 3s after first end electrolysis.Adopt after washing concentration be 33% hydrochloric acid carry out pickling 14min.Twice washing is carried out again, each flow 190L/h, time 4s after pickling.Water washed rear blank enters terminal electrolyzer and carries out terminal electrolysis treatment, and the composition of terminal electrolyte and concentration are: Presol7061:65g/L; The current density of electrolysis is 4A/dm
2, electrolysis temperature is 65 DEG C, and electrolysis time is 6min.Again twice washing is carried out, each flow 180L/h, time 5s after terminal electrolysis.Adopt after washing concentration be 18% hydrochloric acid activate, soak time is 18s.Activation terminates rear pure water and carries out twice washing, each flow 180L/h, time 6s.Be preimpregnation 9s in the NaOH basic solution of 45g/L afterwards in concentration by blank, complete whole preprocessing process.
Pretreated blank will be completed and carry out pot galvanize formation zinc layers, the galvanizing flux of pot galvanize is prepared by embodiment in table 14, coordination agent is Seignette salt, and scavenging agent is more preferably CK778, and walk agent and brightening agent are all the commercially available conventional one walked in agent and brightening agent.In galvanizing process, cathode current density is 1.8A/dm
2, bath temperature is 25 DEG C, and electroplating time is 60min.
First washed by blank after zinc-plated completing, washing is divided into general washing and ultrasonic washing, flow 190L/h, time 5s during general washing; The time 5min of ultrasonic washing.Adopt concentration to be 5ml/L, pH after washing to be the salpeter solution of 2.3 to carry out bright dipping, the time is 14s.After bright dipping, blank carries out the washing of twice, each flow 165L/h, time 6s.Carry out passivation after washing, passivation is divided into be carried out for twice, forms the first passivation film and the second passivation film respectively.First passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315:95ml/L; Passivation temperature is 42 DEG C, pH:2.4, and the time is 55s.After a passivation terminates, carry out twice washing with pure water, each flow 180L/h, time 6s.Then in the second passivating solution, carry out secondary passivity form the second passivation film, the composition of the second passivating solution and concentration are: FINIDIP145:95ml/L; Passivation temperature is: 26 DEG C, pH:2.6, and the time is 28s.After secondary passivity terminates, wash equally with pure water, washing is divided into general washing and exchanges washing, and each flow is 170L/h, time 5s.And then carry out hot water wash and close, the composition of the solution of hot water wash and concentration are: FINIGARD205A:9%; The temperature of hot water wash is 55 DEG C, and pH is 11.6, and the time is 34s.Close to be divided into and carry out for twice, form first respectively and close rete and the second closed rete, first closes rete is formed in the first encapsulant, second closes rete is formed in the second encapsulant, the composition of the first encapsulant and concentration are: FINIGARD460:14%, and the composition of the second encapsulant and concentration are: FINIGARD460:11%; The temperature of the first encapsulant and the second encapsulant is 48 DEG C, and pH is 9.6, and the time is 32s.Last oven dry at 65 DEG C after room temperature environment leeward cuts 5min can obtain end article brake pipe eye joint.
Embodiment 5:
The brake pipe eye joint blank made by iron material first carries out electrochemical deoiling and ultrasonic oil removing, and the composition of the solution of electrochemical deoiling and concentration are: Presol1700:90ml/L; The temperature of electrochemical deoiling is 70 DEG C, and the time is 15min.The composition of the solution of ultrasonic oil removing and concentration are: COVENPREP121:30g/L; The temperature of ultrasonic oil removing is 70 DEG C, and the time is 6min.Then enter just end electrolyzer to carry out just holding electrolysis, composition and the concentration of first end electrolyte are: Presol7061:90g/L; The current density of electrolysis is 5A/dm
2, electrolysis temperature is 70 DEG C, and electrolysis time is 6min.Three washings are carried out, each flow 160L/h, time 2s after first end electrolysis.Adopt after washing concentration be 35% hydrochloric acid carry out pickling 15min.Three washings are carried out again, each flow 160L/h, time 2s after pickling.Water washed rear blank enters terminal electrolyzer and carries out terminal electrolysis treatment, and the composition of terminal electrolyte and concentration are: Presol7061:70g/L; The current density of electrolysis is 5A/dm
2, electrolysis temperature is 70 DEG C, and electrolysis time is 6min.Three washings are again carried out, each flow 160L/h, time 2s after terminal electrolysis.Adopt after washing concentration be 20% hydrochloric acid activate, soak time is 20s.Activation terminates rear pure water and carries out three washings, each flow 160L/h, time 2s.Be preimpregnation 2s in the NaOH basic solution of 50g/L afterwards in concentration by blank, complete whole preprocessing process.
Pretreated blank will be completed and carry out pot galvanize formation zinc layers, the galvanizing flux of pot galvanize is prepared by embodiment in table 15, coordination agent is Seignette salt, and scavenging agent is more preferably CK778, and walk agent and brightening agent are all the commercially available conventional one walked in agent and brightening agent.In galvanizing process, cathode current density is 2A/dm
2, bath temperature is 26 DEG C, and electroplating time is 70min.
First washed by blank after zinc-plated completing, washing is divided into general washing and ultrasonic washing, flow 160L/h, time 2s during general washing; The time 6min of ultrasonic washing.Adopt concentration to be 6ml/L, pH after washing to be the salpeter solution of 2.5 to carry out bright dipping, the time is 15s.After bright dipping, blank carries out the washing of three times, each flow 160L/h, time 2s.Carry out passivation after washing, passivation is divided into be carried out for twice, forms the first passivation film and the second passivation film respectively.First passivation film is formed in the first passivating solution, and the composition of the first passivating solution and concentration are: LANTHANE315:100ml/L; Passivation temperature is 45 DEG C, pH:2.5, and the time is 60s.After a passivation terminates, carry out three washings with pure water, each flow 160L/h, time 2s.Then in the second passivating solution, carry out secondary passivity form the second passivation film, the composition of the second passivating solution and concentration are: FINIDIP145:100ml/L; Passivation temperature is: 30 DEG C, pH:2.8, and the time is 30s.After secondary passivity terminates, wash equally with pure water, washing is divided into general washing and exchanges washing, and each flow is 160L/h, time 2s.And then carry out hot water wash and close, the composition of the solution of hot water wash and concentration are: FINIGARD205A:10%; The temperature of hot water wash is 60 DEG C, and pH is 11.8, and the time is 35s.Close to be divided into and carry out for twice, form first respectively and close rete and the second closed rete, first closes rete is formed in the first encapsulant, second closes rete is formed in the second encapsulant, the composition of the first encapsulant and concentration are: FINIGARD460:15%, and the composition of the solution of the second encapsulant and concentration are: FINIGARD460:12%; The temperature of the first encapsulant and the second encapsulant is 50 DEG C, and pH is 10, and the time is 35s.Last oven dry at 70 DEG C after room temperature environment leeward cuts 6min can obtain end article brake pipe eye joint.
The brake pipe eye connector product made by embodiment of the present invention 1-5 carries out performance test, and wherein erosion resistance adopts salt-fog test to measure, and temperature is set as 35 ± 1 DEG C, and the 5%NaCl solution of solution to be pH value be 6.5-7.2, continues spray.Test result is as shown in table 2.
The performance test results of the brake pipe eye joint that table 2: embodiment of the present invention 1-5 obtains
As known from Table 2, the brake pipe eye joint erosion resistance that the present invention obtains is strong, and the sticking power of zinc layers is good, and through surface observation, zinc layers is smooth bright and clean, has good metalluster, without defects such as plating leakage, solvent spot, peeling, be full of cracks.
Comparative example 1 is only with the difference of embodiment 3, and in comparative example 1, the temperature of galvanizing flux is 30 DEG C.
Comparative example 2 is only with the difference of embodiment 3, and in comparative example 2, the temperature of galvanizing flux is 18 DEG C.
Comparative example 3 is only with the difference of embodiment 3, and in comparative example 3, the cathode current density of galvanizing flux is 2.5A.
Comparative example 4 is only with the difference of embodiment 3, does not contain coordination agent in comparative example 4 in galvanizing flux.
Comparative example 5 is only with the difference of embodiment 3, and in comparative example 5, in galvanizing flux, scavenging agent is 5ml/L.
Comparative example 6 is only with the difference of embodiment 3, and in comparative example 6, in galvanizing flux, scavenging agent is 15ml/L.
Comparative example 7 is only with the difference of embodiment 3, only carries out a passivation in comparative example 7 in last handling process.
Comparative example 8 is only with the difference of embodiment 3, only once closes in comparative example 8 in last handling process.
The brake pipe eye connector product made by comparative example 1-8 carries out performance test, and wherein erosion resistance adopts salt-fog test to measure, and temperature is set as 35 ± 1 DEG C, and the 5%NaCl solution of solution to be pH value be 6.5-7.2, continues spray.Test result is as shown in table 3.
The performance test results of the brake pipe eye joint that table 3: comparative example 1-8 obtains
As known from Table 3, the sticking power of the brake pipe eye joint erosion resistance that obtains of comparative example and zinc layers is all weaker than the sticking power of brake pipe eye joint erosion resistance that the embodiment of the present invention obtains and zinc layers.
Comparative example 9 is only with the difference of embodiment 3, and in comparative example 9, the first passivation film thickness is 0.6 μm.
Comparative example 10 is only with the difference of embodiment 3, and be also formed with the 3rd passive film in comparative example 10, the 3rd passivating solution is identical with the second passivating solution, and passive film total thickness is 0.72 μm.
Comparative example 11 is only with the difference of embodiment 3, reaches 0.5 μm in comparative example 11 at the bottom of the first closed thickness.
Comparative example 12 is only with the difference of embodiment 3, and be also formed with the 3rd closing membrane in comparative example 12, the 3rd encapsulant is identical with the second encapsulant, and closing membrane total thickness is 0.56 μm.
The brake pipe eye connector product made by comparative example 9-12 carries out performance test, carries out wiping to goods.Result is as shown in table 4.
Table 4
| Comparative example | Result |
| 9 | Zinc layers all comes off outward |
| 10 | Zinc layers all comes off outward |
| 11 | Closing membrane pull-up falls |
| 12 | Closing membrane pull-up falls |
As known from Table 4, passivation film is relevant to its bonding force with the thickness of closed rete, and blocked up meeting causes the easy obscission of rete to occur, and affects corrosion resisting property and the aesthetics of goods.
The difference of embodiment 5-10 and embodiment 1-5 is only, coordination agent is EDETATE DISODIUM.
The difference of embodiment 11-20 and embodiment 1-10 is only, the addition of NaOH can also be 100g/L, 105g/L, 108g/L, 112g/L, 118g/L, 126g/L, 135g/L, 138g/L, 140g/L, 145g/L, 150g/L.
The difference of embodiment 21-30 and embodiment 1-10 is only, the addition of brightening agent can also be 0.6ml/L, 0.7ml/L, 1.3ml/L, 1.6ml/L, 1.8ml/L, 2ml/L.
The difference of embodiment 31-40 and embodiment 1-10 is only, the addition of scavenging agent can also be 13ml/L, 14ml/L, 15ml/L.
The difference of embodiment 41-50 and embodiment 1-10 is only, the addition of coordination agent can also be 6g/L, 7g/L, 9g/L, 13g/L, 14g/L, 15g/L.
In technical solution of the present invention, brake pipe eye joint can also adopt materials such as including, without being limited to steel, aluminium alloy, magnesium alloy to make at interior metallic substance.
In view of the present invention program's embodiment is numerous, each embodiment experimental data is huge numerous, be not suitable for particularize explanation herein, but the content of the required checking of each embodiment is all close with the final conclusion obtained, so do not illustrate one by one the checking content of each embodiment, only with embodiment 1-5, the excellent part of the present patent application is representatively described herein.
The non-limit part of technical scope mid point value that this place embodiment is protected application claims, equally all in the scope of protection of present invention.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (8)
1. a process of surface treatment for brake pipe eye joint, is characterized in that, described process of surface treatment is:
Base material is carried out pre-treatment;
Be formed at by protective layer on base material, described protective layer is zinc layers, and thickness is 6-15 μm; With
Passivation film is formed on protective layer; With
Closed rete is formed on passivation film.
2. the process of surface treatment of a kind of brake pipe eye joint according to claim 1, is characterized in that, the thickness of described protective layer is 8-13 μm.
3. the process of surface treatment of a kind of brake pipe eye joint according to claim 1, it is characterized in that, described passivation film comprises the first passivation film and the second passivation film, and described second passivation film is formed on the first passivation film.
4. the process of surface treatment of a kind of brake pipe eye joint according to claim 3, it is characterized in that, the thickness of described first passivation film and the second passivation film is 0.1-0.5 μm, total thickness≤0.6 μm of passivation film.
5. the process of surface treatment of a kind of brake pipe eye joint according to claim 1, it is characterized in that, described closed rete comprises first and closes rete and the second closed rete, and described first closes rete is formed on the second passive film, and second closes rete is formed on the first closed rete.
6. the process of surface treatment of a kind of brake pipe eye joint according to claim 5, is characterized in that, the described first thickness closing rete and the second closed rete is 0.1-0.3 μm, closes total thickness≤0.5 μm of rete.
7. the process of surface treatment of a kind of brake pipe eye joint according to claim 1, it is characterized in that, described zinc layers adopts galvanizing flux hot dip to form, described galvanizing flux is formulated primarily of following composition (in unit volume plating solution addition): Zn:5-9g/L, NaOH:100-150g/L, walk agent: 6-10ml/L, brightening agent: 0.5-2ml/L, scavenging agent: 8-15ml/L, coordination agent: 5-15g/L.
8. the process of surface treatment of a kind of brake pipe eye joint according to claim 7, it is characterized in that, in described hot galvanizing process, cathode current density is 0.5-2A/dm
2, temperature is 20-26 DEG C, and the time is 40-70min.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048418A (en) * | 1989-06-30 | 1991-01-09 | 北京市昌平县七一制镜厂 | Sodium salt Zn-plating secondary passivation filming and technology |
| CN1786288A (en) * | 2005-11-09 | 2006-06-14 | 万向钱潮股份有限公司 | Galvanization technology |
| CN101942655A (en) * | 2010-09-28 | 2011-01-12 | 武汉金泽新时代科技有限公司 | Preparation method of chromium-free passivated liquid and method for passivating electrogalvanizing or zinc alloy layer by same |
| CN203593786U (en) * | 2013-11-01 | 2014-05-14 | 广州市海科顺表面处理有限公司 | Cyanide-free alkali galvanized composite layer for auto parts |
| CN104060310A (en) * | 2014-05-26 | 2014-09-24 | 安徽红桥金属制造有限公司 | Novel zinc-plating and anti-white point corrosion process for casting parts |
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2015
- 2015-09-09 CN CN201510571141.3A patent/CN105132907A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048418A (en) * | 1989-06-30 | 1991-01-09 | 北京市昌平县七一制镜厂 | Sodium salt Zn-plating secondary passivation filming and technology |
| CN1786288A (en) * | 2005-11-09 | 2006-06-14 | 万向钱潮股份有限公司 | Galvanization technology |
| CN101942655A (en) * | 2010-09-28 | 2011-01-12 | 武汉金泽新时代科技有限公司 | Preparation method of chromium-free passivated liquid and method for passivating electrogalvanizing or zinc alloy layer by same |
| CN203593786U (en) * | 2013-11-01 | 2014-05-14 | 广州市海科顺表面处理有限公司 | Cyanide-free alkali galvanized composite layer for auto parts |
| CN104060310A (en) * | 2014-05-26 | 2014-09-24 | 安徽红桥金属制造有限公司 | Novel zinc-plating and anti-white point corrosion process for casting parts |
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Application publication date: 20151209 |