CN1259553A - Protective coating - Google Patents
Protective coating Download PDFInfo
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- CN1259553A CN1259553A CN 99114602 CN99114602A CN1259553A CN 1259553 A CN1259553 A CN 1259553A CN 99114602 CN99114602 CN 99114602 CN 99114602 A CN99114602 A CN 99114602A CN 1259553 A CN1259553 A CN 1259553A
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Abstract
The present invention relates to coating material which is composed of binder and solid microparticles, its main component is epoxy resin modified acid phosphate. It can dry and solidify itself under room temp. In which the coating layer composed of said binder and zinc powder or aluminium powder (or aluminium zinc alloy powder) is sacrificial anode layer of steel, which possesses excellent anticorrosion, heat resistant, oil resistant and adhesion properties. The invented coating material can be directly coated on the steel material surface which is not sand-aerated, and can convert light corrosion or oxidization film on steel surface into the component of coating layer. It is simple and convenient in coating process.
Description
The present invention belongs to a protective coating, particularly to a coating which is composed of an epoxy resin modified acidic inorganic phosphate and solid particles and can be dried and hardened at room temperature. It has excellent anticorrosive, heat resisting, oil resisting, weather resisting and other performance and wide application.
In modern industrial society, metal corrosion is a serious problem, especially in large steel components used in severe corrosive environments, the painting methods usually adopted are not satisfactory for protection, and more effective measures must be taken.
Cathodic protection technology has long been used successfully in the field of corrosion protection of large steel components used in underwater or underground wet environments, but common cathodic protection is not effectivefor sites where large steel parts are on water or where the corrosive medium is discontinuous, where protection with sacrificial anodic coatings, which also serve as cathodic protection, is the most effective method. Hot dip galvanization (aluminum or zinc-aluminum alloy) is one example of a sacrificial anodic coating. Although it works well against corrosion of steel, it is difficult to implement large steel components, and the entire component must be carefully designed because each component can be hot-dip galvanized (aluminum or zinc-aluminum alloy) and then assembled. The component is hot dip galvanized (aluminum or zinc-aluminum alloy). Welding or other processing can not be carried out, otherwise, the damage of the plating layer is difficult to repair. Thermal spray zinc (or aluminum) is another example of a sacrificial anode coating. Although it can be used for integrally spraying assembled components, it is difficult to implement large steel components. Inorganic zinc-rich coatings that cure spontaneously at room temperature are therefore desired. British patent 958787 and us patent 4219358 are two examples of such coatings. The inorganic zinc-rich coating has negative potential of zinc, so the inorganic zinc-rich coating is also a sacrificial anode coating, but the actual effect of the inorganic zinc-rich coating for large steel members is not ideal, and the reason is as follows: the first reason is that the inorganic silicate zinc-rich coating requires strict oil and rust removing surface cleaning on the steel member before coating, and sand blasting is carried out on the surface to Sa2.5 grade at least, and the roughness reaches 40-70 microns. Manually descaling the surface does not allow the application of silicate zinc-rich coatings. However, for technical and economic reasons, it is difficult to achieve the above conditions for many steel members, for example, sand blasting in recessed areas such as grooves and gaps of large steel members is not easy to achieve, rust and dirt are difficult to remove completely, the existing inorganic silicate zinc-rich coating is not easy to adhere in these areas, the development of rust in these areas cannot be effectively inhibited, and finally the coating is also bubbled and falls off; the second reason is that the inorganic zinc-rich coating adopts silicate binder, which has poor toughness, and the thick coating is easy to crack and peel off and is not easy to control the construction quality. The third reason is that the inorganic silicate zinc-rich coating and the surface coating have poor matching performance and are easy to cause bubbling and shedding of the surface coating in the actual use process. In response to the difficulty in thoroughly descaling large steel components, a coating called a primer with rust has come into force, and chinese patent CN87102047 and british patent GB2160877 are two examples of such coatings. The paint can react with the iron rust on the surface of steel (dissolving rust), so that the steel can be coated with rust, the process of blowing sand to remove rust is omitted, and the surface cleaning operation before coating is greatly simplified. However, the coating does not have the function of cathodic protection and has low corrosion resistance, so the coating can not meet the requirement of long-term protection of large steel components.
Us patent 3248251 discloses an inorganic aluminum coating (hereinafter referred to as inorganic aluminum coating) invented by Allen (Allen), which is a coating composed of phosphates, chromates and aluminum powders of +2 and +3 valent metals, is an inorganic (sacrificial) anode coating with excellent performance, and is widely used for protection of various steel parts of aircraft engines. It has excellent anticorrosive performance. Its adhesion, toughness, heat resistance, oxidation resistance, oil resistance and anticorrosion ability are far superior to the inorganic zinc-rich coating and other anticorrosion coatings. Although it is as inorganic as the zinc rich coating, the binder of the former is phosphate and the binder of the latter is silicate, which is the main reason why the former is superior in performance to the latter. As is well known, the phosphating of steel is a surface treatment technology for steel parts, and the iron phosphate protective film formed by the chemical reaction between the steel surface and phosphate has the main function of improving the binding force between a substrate and paint besides the protection function, but the silicate zinc-rich coating cannot play the role.
The main disadvantage of the inorganic aluminum coating is that it can not dry and solidify at room temperature like inorganic zinc-rich coatings, it must be heated to 650 ° F for solidification, and the solidified coating needs to be post-treated (glass bead blasting or reheating to 1000 ° F) for electrical conduction to have the function of cathodic protection. Such heating and post-treatment of large steel components is very difficult, thus limiting the range of applications.
In view of the above disadvantages, patent application No. 97107671.5 discloses an inorganic coating material comprising acidic phosphates of +2 and +3 metals dispersed in liquid alcohol, a binder of liquid ketone and water, and zinc (or aluminum) powder. This patent application provides a fabrication technique for sacrificial anodic coatings that self-dry and cure at room temperature, thereby enabling the widespread use of inorganic phosphate coatings with excellent corrosion resistance on large steel components.
Observing the chemical reaction of the inorganic aluminum coating curing process of the Ironlily invention can discover the paintThe original hexavalent chromium salt (i.e. chromate) is almost completely reduced by the aluminum powder in the coating during the heating and curing process and is converted into trivalent chromium salt. The following ion equation can be used to express: as a result of the redox, a large amount of metal cations C are added to the coatingr 3+And Al3+While H is+Greatly reduces the change of acidity to neutrality of the coating. The weakening of acidity causes the original acidic dihydrogen phosphate (i.e. the primary phosphate) contained in the coating which is easily soluble in water to be converted into water-insoluble neutral ortho phosphate (i.e. the tertiary phosphate), and simultaneously, the hexavalent chromium salt which is easily soluble in water is also converted into water-insoluble trivalent chromium salt, so that the coating is completely cured. The oxidation-reduction reaction is completed under the condition of heating, and the aluminum powder is in a passivation state under the action of the hexavalent chromium salt at room temperature, so that the coating is also in a stable state and cannot be solidified. It is envisaged that if chromates are eliminated from the above coating, the aqueous acidic phosphate solution of the +2 and +3 valent metals will react with the aluminium powder (or zinc powder) at room temperature to form water-insoluble neutral compounds. The reaction of the acidic phosphate of a divalent metal (denoted by M) with the aluminum powder is now exemplified as follows:
It is stated in the specification of application No. 97107671.5 that if the ratio of the phosphate content to the +2, +3 valent metal ion content in the acid phosphate is maintained within a suitable range, the acid phosphate can be dispersed or dissolved in a liquid alcohol, or a mixture of a liquid alcohol and water, or a mixture of a liquid alcohol, a liquid ketone and water, to form a viscous gel. The paint formed by mixing the aluminum powder, the zinc powder or other solid powder as a binder can keep a stable state in a storage tank for a period of time, namely the service life (also called the pot life) of the paint, and the coating operation can be completed in the period of time. The presence of the liquid alcohol retards the rate of chemical reaction between the acidic phosphate and the aluminum (or zinc) powder or other powders. When the coating is applied to a substrate, chemical reactions between the components of the coating are gradually accelerated as the solvent evaporates, and the coating dries and hardens. By adjusting the content of each component in the binder, the self-drying and hardening (or curing) speed of the coating at room temperature and the service life of the coating can be effectively controlled.
Although the inorganic phosphate coating proposed by the invention of application No. 97107671.5 has excellent corrosion resistance and is self-drying and curing at room temperature, the adhesion of the inorganic phosphate binder to the substrate steel and the flexibility of the coating do not meet the requirements of some steel components.
The main purpose of the invention is to create a paint component and a coating which have excellent performances of corrosion resistance, heat resistance, weather resistance, oil resistance and the like, and simultaneously have excellent mechanical properties of adhesion, flexibility and the like, have simple and convenient coating process, can be self-dried and cured at room temperature, do not need harsh pretreatment of coating, and can be directly coated on steel with slight rust to obtain the performances. Other objects and advantages of the present invention will be discussed and illustrated in some of its applications.
It has been found that the addition of an appropriate amount of epoxy resin (or modified epoxy resin) to an acidic inorganic phosphate effectively increases the adhesion and flexibility of the phosphate binder, when the molar ratio of epoxy to phosphate is close to 3: 1, the reactants become insoluble, bulky molecules of network structure, and thus it is not possible to use it as a coating, and when the molar ratio of epoxy to phosphate is small, it does not form insoluble matter, but increases the adhesion and flexibility of the coating.
In the above binder, the molar ratio of phosphate to +2, +3, +4 metal ions is selected within the range of 1.5-9: 1, when the ratio of phosphate content to +2, +3, +4 metal ions is large, the acidity of the coating is large, and when the ratio is small, the acidity of the coating is weak, for a steel substrate with rusty surface, it is preferable to first apply a coating with high acidity, for example, a coating with a molar ratio of phosphate to +2, +3, +4 metal ions of 9: 1 (binder formulation four), which has a strong effect of dissolving and converting rust, and then apply a coating with moderate acidity (for example, a binder of formulation one, wherein the molar ratio of phosphate to +2, +3, +4 metal ions is 6.39: 1) after the coating is dried. For passive solid particles, it is preferred to use a less acidic binder to formulate the coating. It may also be desirable to coat non-metallic substrates or to coat passive metallic substrates with coatings having low acidity (e.g., a molar ratio of phosphate to +2, +3, +4 metal ions in the binder of 1.5: 1). For the more acidic binders, anhydrous or low-water liquid alcohols (or mixtures of low-water liquid alcohols and liquid ketones) are preferably used. This can extend the useful life of the coating. The adhesive with weaker acidity has lower reaction speed with aluminum (or zinc) powder or other powder, and the service life of the coating is longer. In order to prolong the service life of the coating and improve the corrosion resistanceCorrosion effect, and can be used in paintAdding metal corrosion inhibitor in the amount less than 1molL, for example, hexavalent chromium compounds, such as chromic anhydride, chromate or dichromate, are added.
The +2, +3, +4 valence metal ions in the binder are mainly metal ions such as chromium, magnesium, zinc, calcium, strontium, aluminum, iron, manganese, barium, lead, copper, tin, molybdenum and titanium, wherein the chromium is selected from +3 valence chromium ions or +3 valence chromium ions obtained by reducing +6 valence chromium with a reducing agent in a phosphoric acid solution, and may also contain a small amount of +1 valence metal ions such as sodium, potassium and lithium. However, the content of +1 valent metal ions should be minimized so as not to increase the hygroscopicity of the coating. The liquid alcohol in the binder is selected from ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, and liquid polyols, and the like, and mixtures thereof. The liquid ketone in the binder is selected from the group consisting of acetone, butanone, cyclohexanone, methylcyclohexanone, diacetone alcohol, and the like, and mixtures thereof. The solvent content in the binder can be changed according to different requirements, and for the superfine solid particles with low density and small particle size, a thinner binder is preferably used for blending the coating, and the solvent content in the coating can be up to 90 percent. Phosphate [ (PO) in paint4)3-]The content of (A) is 0.45-10molA total amount of metal ions is 0.05 to 6.2moland/L, the content of the solvent is 0-90%.
The solid particles in the coating are metal powder such as magnesium, zinc, aluminum and the like or alloy powder based on the metals and passivated zinc powder or zinc alloy powder, zinc-coated aluminum powder and zinc-infiltrated aluminum powder for an anti-corrosion coating, graphite powder, carbon black, silver or silver alloy powder, copper or copper alloy powder, zinc or zinc alloy powder and other conductive powder for a conductive coating, graphite, boron nitride, molybdenum disulfide, tungsten disulfide, talcum powder, lead oxide and other lubricating powder for a solid lubricating coating, and refractory oxide, refractory nitride, refractory carbide, refractory silicide and other heat-resistant powder for a heat-resistant coating. The paint may also contain superfine powder of zinc, aluminum, magnesium, titanium, chromium and other metal oxide, hydroxide, phosphate or polyphosphate with diameter less than 1 micron for regulating the viscosity and curing the paint. In order to improve the corrosion life of the coating, corrosion inhibitors, such as chromates or dichromates of metals such as calcium, strontium, barium, zinc, lead, etc., may also be added to the coating to slow the sacrificial loss of aluminum, zinc, magnesium, and alloys thereof. Various inorganic pigments and organic pigments can also be added to adapt to different requirements. The coating should contain solid particles that pass through a 100 mesh screen, preferably a 325 mesh screen. The amount of the solid particles is determined according to different applications, and the amount of the solid particles contained in each liter of the coating is selected from the range of 0 to 2200g, preferably 300 to 1200 g. When used as a varnish, the varnish may be used without reinforcing solidparticles.
The zinc powder or zinc alloy powder subjected to passivation treatment can slow down sacrificial loss of the coating and improve the protection effect of the coating. Chromate passivation or chromium-free passivation may be selected. When chromate is used for passivation, the composition of the passivation film is mainly a compound consisting of one or more of zinc, strontium, barium, calcium, lead, trivalent chromium and the like, oxygen and hexavalent chromium.
After the metal (or alloy) powder of zinc, aluminum, magnesium, etc. in the solid particles and the oxide, hydroxide powder of these metals and the adhesive glue solution react, the acidic first generation phosphate in the glue solution is converted into the second generation phosphate (equation ②), and then converted into the completely water-insoluble third generation phosphate (equation ③). in order to promote the coating to be cured completely, a curing accelerator can be added into the coating, the curing accelerator is selected from various organic compounds containing amine (or amino), substituted urea, imidazole, polysulfide, various media with pH value of 8-14, and substances capable of promoting the epoxy resin to be cured or reducing the acidity of the phosphate.
In order to enhance the rust conversion capability of the coating, a proper amount of rust conversion agent, such asPotassium ferricyanide [ K]4Fe(CN)6·3H2O]Tannic acid (C)16H52O46) And other iron ion complexing agents.
The technical effect of the present invention is discussed below in connection with a coating process. The first advantage is that the coating process of the present invention is simple and convenient, and thus it has a very wide range of applications. The coating can dissolve slight rust or oxidation film and trace oil stain andwater, so that sand blowing treatment on a base material before coating is allowed to be avoided, and the coating can be self-dried and cured at room temperature, so that the coating process is greatly simplified. The coating can be coated by adopting methods such as brushing, rolling, spraying and the like, the number of the coated layers and the thickness of the coating are determined according to actual requirements, the phenomenon that the coating is thick and can crack and fall off as the existing silicate zinc-rich coating does not exist, the coating can be repeatedly coated according to the actual requirements to obtain a very thick coating, and therefore the higher cathode protection life is obtained. After the paint prepared by zinc powder is coated, the coating is dried after being placed in the air at room temperature for a plurality of minutes, and the coating is completely dried in about 1 hour. The cured zinc coating has better conductivity and corrosion resistance. The curing speed of the aluminum coating is low, and in order to accelerate the curing speed of the aluminum coating, the dried and hardened aluminum coating can be rapidly heated to 400-650 DEG F, and the aluminum coating can be completely cured within a few minutes. Because the surface of the aluminum powder is provided with a layer of compact oxide film, the cured aluminum coating is still not conductive, and the coating can be rapidly heated to be close to the melting point of aluminum by adopting various heat sources, so that the aluminum coating is conductive within a few seconds; the aluminum powder in the solidified aluminum coating can be communicated and conducted by adopting a mechanical extrusion method. If the pure aluminum powder is replaced by the aluminum-zinc alloy powder, the zinc-coated aluminum powder or the zinc-infiltrated aluminum powder, the coating can have conductivity after being cured at room temperature, and has the advantages of both an aluminum coating and a zinc coating. The cured coating is not only insoluble in cold water and hot water at 80 ℃, but also resistant to long-term soaking of various oils without swelling or deterioration. The coatings also have high heat resistance (e.g., the aluminum coatings of the present invention have a heat resistance of up to 1100F), oxidation resistance, and weatherability. The resistivity of the aluminum coating is only 1 omega m, which is ten-thousandth to ten-thousandth of the resistivity of the existing inorganic zinc-rich coating, and the coating has high conductivity and negative potential, so that the excellent cathode protection function is obtained.
The following is a description of the measured performance of the zinc coating of the present invention:
| inspection item | The result of the detection | Inspection method | Remarks for note | |
| Drying time | Exterior dryness, min | ＜5 | GB1728-79 method | |
| Hard dry, h | ＜1 | GB 1728-79A process | ||
| Salt water resistance (21d) | No flaking, bubbling and raw Rust | GB 1763-79A method | ||
| Salt spray resistance (7d) | No flaking, bubbling and raw Rust | GB/T1771-91 | The dry film thickness was 50 μm, advanced Line 2500 hours | |
| Heat resistance (400 + -10 deg.c, 4h) | without peeling, falling off and opening Crack (crack) | GB1735-79 | ||
| Resistance to hot salt water (80 c, 2h) | no flaking and bubbling | GB1763-79 method | ||
| Adhesion force, grade | 1 | GB1720-79 | ||
| Flexibility, mm | 1 | GB/T1731-93 | ||
| Impact resistance, kg cm | 50 | GB/T1732-93 | ||
| Kerosene resistant (21d) | Without peeling, falling off and opening Crack (crack) | GB/T1734-93A Method of | ||
| Diesel fuel resistance (21d) | Without peeling, falling off and opening Crack (crack) | GB/T1734-93A Method of | ||
| Gasoline resistance (21d) | Without peeling, falling off and opening Crack (crack) | GB/T1734-93A Method of | ||
| That is 1% secondary alkyl sulfonic acid Sodium solution, 48h | Without peeling, falling off and opening Crack (crack) | GB 1763-79A method | ||
| Cross cut adhesion, grade | 1 | GB9286-88 | ||
| Adhesion by pulling open method | 5.44Mpa.A | GB5210-85 | ||
| Abrasion resistance (500g ) Rotary) | Weight loss of 0.075 g | GB1768-79(89) | ||
The following describes some embodiments of the invention, which are merely exemplary representations, and do not contain the full scope of the invention, and therefore should not be construed as limiting the invention.
(1) Preparation of the Binder
Formulation I
Chromium dihydrogen phosphate [ Cr (H)2PO4)3]0.24mol
Phosphoric acid (H)3PO4) 0.84mol
0.0004mol of magnesium oxide (MgO)
Water (H)2O) 40g
Epoxy resin 85g
Cyclohexanone [ CH2(CH2)4CO]230g
Adding ethanol (C) after the dissolution is finished2H5OH) to 1L
Formulation II
Aluminum phosphate (AlPO)4) 0.67mol
Magnesium dihydrogen phosphate [ Mg (H)2PO4)2·3H2O]0.1mol
Phosphoric acid (H)3PO4) 0.7mol
0.03mol of zinc oxide (ZnO)
Water (H)2O) 30g
Epoxy resin 30g
Diacetone alcohol [ (CH)3)2COHCH2COCH3]90g
Ethanol (C)2H5OH) to 1L
Formulation III
Chromium dihydrogen phosphate [ Cr (H)2PO4)3]0.15mol
Phosphoric acid (H)3PO4) 1.08mol
0.02mol of magnesium oxide (MgO)
Epoxy resin 70g
Methyl ethyl ketone (CH)3COC2H5) 120g
Water (H)2O) 30g
Adding ethanol (C) after the dissolution is finished2H5OH) to 1L
Formulation IV
And 12g of potassium ferrocyanide is added into the formula III to enhance the rust conversion function of the coating.
(2) Examples of the application of the coating
Example one
1L of adhesive (according to formula I)
1200g of zinc powder (particle size 5-10 μm)
After being stirred uniformly, the mixture is coated on 3 carbon steel test pieces with light rust, and the thickness of the coating is about 45-55 mu m. After the coating was allowed to stand in air at room temperature for 7 days, a sharp instrument was used to scratch an "X" over the coating until the base steel was exposed, and the coating was kept at 95 ℃ F. in a 5% NaCl salt spray cabinet and no rust appeared over 1000 hours.
Example two
Binder (according to formula II) 1L
420g of aluminum powder (spherical aluminum powder with particle size of 4-5 mu m)
After being stirred uniformly, the mixture is coated on 8 carbon steel test pieces with the thickness of 1mm, and the thickness of the coating is about 55-65 mu m. Drying at room temperature for 1 hour until the coating is dried and hardened and the nail cannot be scraped off, quickly burning the test piece to deep red by oxyacetylene flame, measuring the resistivity of the coating layer to be about 0.2-0.5 omega.m after cooling, bending 2 test pieces along the curvature with the diameter of 8mm for 90 degrees, and preventing the coating from falling off. Another 3 test pieces were subjected to the salt spray test for 1000 hours under the same conditions as in example 1 to prevent the occurrence of rust. The remaining 3 test pieces were subjected to a heat resistance test and baked at 1050 ℃ F. for 100 hours to leave the coating intact.
EXAMPLE III
Binder (according to formula II) 1L
Graphite (colloidal powder) 250g
0.2mol of magnesium oxide (particle size less than 1 μm)
0.15mol of aluminum hydroxide (particle size less than 1 μm)
500ml of ethanol
The coating is coated on the surface of nonmetal such as ceramics, glass or plastics, is placed for 2 hours at room temperature and then is baked for 30 minutes at 400 DEG F, and the coating has good electric conduction and lubricating effect. The graphite coating coated on the ceramic can resist 1500 DEG F high temperature.
Example four
500g of boron nitride is coated on heat-resistant steel instead of 200g of graphite, the coating process is the same as that of example 3, the coating has good lubricating and antifriction effects, and the coating can resist 1800 DEG F for 50 hours without cracking.
EXAMPLE five
500g of molybdenum disulfide is used for replacing graphite and is coated on a steel piece, the coating process is the same as that of example 3, and the coating has good lubricating and antifriction effects.
EXAMPLE six
700g of alumina is used for replacing graphite and is coated on stainless steel, the coating process is the same as that of the embodiment 3, and the coating can resist the high temperature of more than 1500 ℃ F and has the heat insulation effect.
EXAMPLE seven
940g (95% Zn 5% AL) of a zinc-aluminum alloy powder was used instead of the zinc powder, and the corrosion resistance of the coating was superior to that of the zinc coating in the same manner as in example 1.
Example eight
The procedure of example 2 was repeated except that 500g (55% Al, 43.5% Zn, 1.5% silicon) of a zinc-aluminum alloy powder was used in place of 330g of the aluminum powder. The properties of the coating are very similar to those of the aluminum coating of example 2, but the cathodic protection function is superior to that of the aluminum coating in a corrosive medium without chloride ions.
Example nine
The addition of 2g of strontium chromate in example 1, otherwise the same as in example 1, extended the protective life of the zinc coating.
Example ten
The steel test piece is soaked in gasoline containing 0.1% of mechanical lubricating oil for a moment, a thin oil film is formed on the test piece after the steel test piece is taken out and dried, and the salt spray test is carried out after the coating is coated according to the same coating and method as the example 1, and the effect is the same as the example 1.
EXAMPLE eleven
The test pieces coated with the coatings according to the examples 1 and 2 are taken out after being soaked in kerosene for 3000 hours, and the coatings are intact as before and the performances are not changed after the tests.
Example twelve
1L of adhesive (four according to formula)
Zinc powder 1200g
The surface of the rusty steel piece is coated with a coating (converted rust) according to the formula, and then the second and third layers are coated according to the first embodiment, so that the effect is the same as that of the first embodiment.
Claims (12)
1. A coating is characterized in that a binder of the coating consists of an epoxy resin modified acidic inorganic phosphate and a solvent, the content of the acidic phosphate in terms of phosphorus (P) in the coating is 0.45-10mol/L, the total content of metal ions contained in the phosphate is 0.05-6.2mol/L, the content of epoxy groups is not less than 0.00015mol/L, the content of the solvent is 0-90% (weight ratio), and the amount of solid particles is 0-2200 g/L.
2. The coating of claim 1 wherein the ratio of the moles of epoxy groups in the epoxy resin to the moles of phosphorus (P) in the acidic phosphate is not greater than 2.5.
3. The coating of claim 1 wherein the epoxy resin is a modified epoxy resin.
4. The coating of claim 1 wherein the acidic phosphate metal ion is selected from the group consisting of magnesium, zinc, aluminum, calcium, strontium, iron, manganese, barium, lead, copper, tin, chromium, molybdenum, titanium, potassium, sodium, lithium, and mixtures of two or more of these acidic phosphates.
5. The coating composition of claim 4 wherein the molar ratio of the total amount of phosphorus (P) and metal ions in the binder is 1.5 to 9: 1.
6. The coating of claim 1 wherein the solvent is selected from the group consisting of ethanol, methanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, liquid polyols, acetone, butanone, cyclohexanone, methylcyclohexanone, diacetone alcohol, and water, and mixtures of two or more thereof.
7. The coating of claim 1 wherein the solid particles are selected from the group consisting of metallic and non-metallic powders and mixtures thereof, all of which are capable of passing through a 100 mesh screen.
8. The coating composition of claim 1, wherein the solid particles are selected from the group consisting of aluminum powder, aluminum alloy powder, zinc alloy powder, magnesium alloy powder, silver alloy powder, copper alloy powder, passivated zinc powder (zinc alloy powder), zinc-coated aluminum powder, zinc-impregnated aluminum powder, graphite, carbon black, molybdenum disulfide, tungsten disulfide, talc, lead oxide, boron oxide, titanium dioxide, magnesium oxide, magnesium hydroxide, zinc oxide, zinc hydroxide, aluminum oxide, aluminum hydroxide, magnesium zinc aluminum phosphate or polyphosphate, calcium strontium barium zinc lead chromate or dichromate, refractory oxide, refractory nitride, carbide, silicide refractory, inorganic pigments, and organic pigments, and mixtures of two or more of the foregoing solid particles.
9. The coating of claim 8, wherein the passivated zinc powder (zinc alloy powder) has a protective film formed by chromate or non-chromium passivation on the surface.
10. The coating of claim 9, wherein the zinc powder (zinc alloy powder) is passivated with chromate to form a protective film comprising one or more of zinc, strontium, barium, calcium, lead, trivalent chromium, and the like, and oxygen and hexavalent chromium.
11. The coating of claim 1 wherein the rust-bearing conversion agent is selected from the group consisting of potassium ferrocyanide, tannic acid, and other iron complexing agents.
12. The coating composition of claim 1, wherein a curing accelerator is added to or applied to the dried and hardened coating, and the curing accelerator is selected from the group consisting of amine (or amino) containing organic compounds, substituted ureas, imidazoles, polysulfide compounds and various media having a pH of 8 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114602 CN1259553A (en) | 1999-01-05 | 1999-01-05 | Protective coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99114602 CN1259553A (en) | 1999-01-05 | 1999-01-05 | Protective coating |
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| CN1259553A true CN1259553A (en) | 2000-07-12 |
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| CN101891415A (en) * | 2010-07-15 | 2010-11-24 | 南京信息工程大学 | Corrosion resistance coating for steel and preparation method thereof |
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1999
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