Metal surface coating process

A coating process and metal surface technology, which is applied to the device for coating liquid on the surface, pretreatment surface, coating and other directions, can solve the problem of incomplete cleaning of embroidery and surface oxide film, reduction of anti-corrosion performance of metal surface, and coating effect. Poor and other problems, to avoid complete corrosion, improve the adhesion of the paint film, and achieve the effect of uniform film thickness

Active Publication Date: 2021-06-22
上海阿尔斯通交通电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primers currently used are to cover a layer of phosphating film on the metal surface by phosphating, or to use chromate solution to interact with the metal to form a trivalent or hexavalent chromium layer on the metal surface, and chromization It is easy to cause environmental pollution problems
And grinding is not suitable for all metal workpieces. For some metal workpieces with corners and cylindrical shapes, it is difficult to grind, and because some dead corners cannot be polished, the embroidery and surface oxide film are not completely cleaned, resulting in poor subsequent coating effects, resulting in Reduced corrosion resistance of metal surfaces

Method used

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Examples

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Effect test

preparation example 1

[0048]A metallic paint consisting of a primer and a topcoat. The primer is composed of the main agent and the curing agent according to the weight ratio of 5:7. The components and corresponding weights in the main agent are shown in Table 1, and are prepared by the following steps:

[0049] S11. Add the polycarboxylate into the E44 water-based epoxy resin at a rotating speed of 250r / min, stir for 15min, increase the stirring speed to 1000r / min, continue to add silicon dioxide, aluminum tripolyphosphate and water, and stir for 35min;

[0050] S12. Grind until the material fineness is ≤45 μm, then continue to add sodium nitrite at a speed of 300 r / min, stir for 20 minutes, and adjust the viscosity to ≥2 Pa·s.

[0051] Each component and corresponding weight in the curing agent are shown in Table 2, and are prepared through the following steps:

[0052] S21. Add water to the polyamine curing agent at a rotational speed of 280r / min, stir for 15 minutes, then continue to add ethyl...

preparation example 2

[0058] A metallic paint consisting of a primer and a topcoat. The primer is composed of the main agent and the curing agent according to the weight ratio of 5:1. The components and corresponding weights in the main agent are shown in Table 1, and are prepared by the following steps:

[0059] S11. Add the polycarboxylate into the E44 water-based epoxy resin at a rotating speed of 350r / min, stir for 8min, increase the stirring speed to 1200r / min, continue to add silicon dioxide, aluminum tripolyphosphate and water, and stir for 20min;

[0060] S12. Grind until the material fineness is ≤45 μm, then continue to add sodium nitrite at a speed of 350 r / min, stir for 10 minutes, and adjust the viscosity to ≥2 Pa·s.

[0061] Each component and corresponding weight in the curing agent are shown in Table 2, and are prepared through the following steps:

[0062] S21. At a speed of 320r / min, add water to the polyamine curing agent, stir for 8 minutes, then continue to add ethylene glycol ...

preparation example 3

[0068] A metallic paint consisting of a primer and a topcoat. The primer is composed of the main agent and the curing agent according to the weight ratio of 5:4. The components and corresponding weights in the main agent are shown in Table 1, and are prepared by the following steps:

[0069] S11, at a rotating speed of 300r / min, add polycarboxylate into E44 water-based epoxy resin, stir for 12min, increase the stirring speed to 1100r / min, continue to add silicon dioxide, aluminum tripolyphosphate and water, and stir for 28min;

[0070] S12. Grind until the material fineness is ≤45 μm, then continue to add sodium nitrite at a speed of 400 r / min, stir for 15 minutes, and adjust the viscosity to ≥2 Pa·s.

[0071] Each component and corresponding weight in the curing agent are shown in Table 2, and are prepared through the following steps:

[0072] S21. Add water to the polyamine curing agent at a speed of 300r / min, stir for 12 minutes, then continue to add ethylene glycol butyl ...

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Abstract

The invention relates to the technical field of metal surface treatment, and particularly discloses a metal surface coating process. The metal surface coating process specifically comprises the following steps: (1) polishing treatment: polishing the surface of a metal workpiece through sand blasting and shot blasting; (2) etching treatment: carrying out etching treatment on the surface of the metal workpiece through an etching solution, wherein the etching solution is prepared from the following components in parts by weight: 5 to 10 parts of a sulfuric acid solution, 0.1 to 0.3 part of benzotriazole, 0.3 to 0.5 part of methyl glucose polyoxyethylene ether and 0.3 to 0.5 part of a surfactant; (3) silane treatment: adopting silane treatment liquid for conducting silane spraying conversion on the surface of the metal workpiece; (4) drying: drying the metal workpiece subjected to silane conversion; and (5) coating: conducting primer coating and finish coating on the surface of the dried metal workpiece. According to the metal surface coating process provided by the invention, the surface of the workpiece is subjected to etching treatment before silane treatment, so that a uniform rough surface is formed, the binding force of subsequent film layers is greatly improved, and the overall adhesive force and the overall compactness of the coated film layers are improved.

Description

technical field [0001] The present application relates to the technical field of metal surface treatment, more specifically, it relates to a metal surface coating process. Background technique [0002] Metal surface coating is generally divided into two parts: one is the surface treatment of the metal before coating, also called pre-treatment technology; the other is the construction process of coating. Surface treatment is divided into mechanical method and chemical method according to the treatment method. The mechanical method is to remove the oxide layer, paint and rust on the metal surface by manual methods, electric tools, flame method or sandblasting and shot blasting; while the chemical method is to remove the oxide layer, paint and rust on the metal surface through chemical methods The process of degreasing, derusting and cleaning is carried out in the way of reaction. The quality of surface treatment directly affects the quality of coating, which is related to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D3/10B05D7/24B05D7/00
CPCB05D7/14B05D3/102B05D7/24B05D7/58B05D2518/10B05D2504/00B05D2502/00
Inventor 王晨华
Owner 上海阿尔斯通交通电气有限公司
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