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Aluminum alloy product chemical conversion treatment process and nonferrous chromium-free film-forming agent

A chemical conversion treatment, aluminum alloy technology, applied in the direction of metal material coating process, can solve problems such as strong carcinogenicity, and achieve the effect of excellent corrosion resistance and excellent adhesion

Inactive Publication Date: 2015-01-07
湖州织里天荣铝材添加剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, my country mainly uses chromizing agents for chemical conversion treatment, which contain hexavalent chromium and trivalent chromium, which are highly toxic substances to organisms and have strong carcinogenicity, so many countries in the world have restricted the use of chromizing agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Colored chrome-free film former composition:

[0021] Titanium sulfate (calculated as metal ions): 0.1g / L, citric acid: 0.3g / L,

[0022] Fluoboric acid: 0.3g / L, acrylic resin: 1.0g / L,

[0023] Nano silicon dioxide: 0.1g / L, deionized water: balance.

[0024] Process conditions: pH (adjusted with acetic acid or ammonia water) 5.0, temperature 35°C.

[0025] Put the aluminum alloy products treated in A and B above into the above-mentioned blocking solution for 10 minutes. Take out the tap water and wash it twice, then wash it once with deionized water, and dry it at 60° C. for 40 minutes.

[0026] Check that a light blue conversion film is formed on the surface of the sample.

Embodiment 2

[0028] Colored chrome-free film former composition:

[0029] Zirconium sulfate (calculated as metal ions): 1.0g / L, gluconic acid: 0.5g / L,

[0030] Sodium fluoride: 1.0g / L, epoxy resin: 0.5g / L,

[0031] γ-aminopropyltriethoxysilane: 0.2g / L deionized water: balance.

[0032] Process conditions: pH (adjusted with acetic acid or ammonia water) 4.5, temperature 30°C.

[0033] Put the aluminum alloy products treated in A and B above into the above-mentioned blocking solution for 6 minutes. Take out the tap water and wash it twice, then wash it once with deionized water, and dry it at 80° C. for 30 minutes.

[0034] Check that a light blue conversion film is formed on the surface of the sample.

Embodiment 3

[0036] Colored chrome-free film former composition:

[0037] Fluotitanic acid (calculated as metal ions): 2.0g / L, ammonium fluoride: 0.2g / L,

[0038] Tannic acid: 1.0g / L, polyurethane resin: 0.5g / L,

[0039] γ-glycidyl etheroxypropyltrimethoxysilane: 0.2g / L, deionized water: balance.

[0040] Process conditions: pH (adjusted with acetic acid or ammonia water) 4.0, temperature 20°C.

[0041] Put the aluminum alloy products treated in A and B above into the above-mentioned blocking solution for 4 minutes. Take out the tap water and wash it twice, then wash it once with deionized water, and dry it at a temperature of 90° C. for 20 minutes.

[0042] Check that a light yellow conversion film is formed on the surface of the sample.

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PUM

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Abstract

The invention provides a film-forming agent capable of obtaining a chemical conversion coating with very good corrosion resistance, hexavalent chromium or heavy metal is not contained, sewage treatment is simple, and no pollution is caused to the environment. An aluminum alloy nonferrous chromium-free film-forming agent contains at least one of water-soluble titanium compounds or water-soluble zirconium compounds, the content is 0.05-3.0g / L (according to metal ions), and the content of organic carboxylic acid is 0.1-1.0g / L. The film-forming agent further comprises 0.1-1.0 g / L of an accelerant and 0.02-5.0g / L of a sealing agent.

Description

technical field [0001] The invention belongs to the technical field of additives, and more specifically relates to a chemical conversion treatment process for aluminum alloy products and a colored chrome-free film-forming agent. Background technique [0002] Aluminum alloy products have poor corrosion resistance when exposed to the environment, and the surface is easily corroded by various factors. Therefore, chemical conversion treatment must be carried out to form a conversion film to enhance corrosion resistance and adhesion of the coating. [0003] At present, my country mainly uses chromizing agents for chemical conversion treatment, which contain hexavalent chromium and trivalent chromium, which are highly toxic substances to organisms and have strong carcinogenicity, so many countries in the world have restricted the use of chromizing agents . At present, my country's requirements for total chromium in wastewater from areas with serious environmental pollution are not...

Claims

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Application Information

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IPC IPC(8): C23C22/73
CPCC23C22/73C23C22/34
Inventor 周国新顾志山
Owner 湖州织里天荣铝材添加剂厂
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