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Normal temperature fast filming fluid for aluminium alloy surface and its usage

A technology of aluminum alloy surface and film-forming liquid, which is applied in the field of metal surface chemical conversion liquid that does not contain hexavalent chromium, can solve problems such as difficulty in obtaining a uniform color protective film, inability to realize industrial continuous production, and low concentration of dissolved titanium ions , to achieve the effect of saving industrial production time and energy, reducing costs and reducing production costs

Inactive Publication Date: 2007-08-22
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the "chromium-free conversion coating" announced by U.S. Patent 6,638,369, its treatment solution has the advantage of not containing hexavalent chromium, and the fluoride in the same range as the existing hexavalent chromium conversion process has been added to the treatment solution, but due to The sodium titanate or potassium titanate used in this process has extremely low solubility in water, so the effective concentration of dissolved titanium ions is low, which cannot guarantee the quality of the film in the continuous production process, cannot meet the requirements of industrial continuous production, and contains extremely toxic Potassium ferricyanide
Moreover, since the temperature of the conversion liquid used in this process is in the range of 60 to 80°C, a large amount of energy will be consumed
[0006] For high-strength aluminum alloys, due to the dissolution of many metal ions during the conversion reaction, such as Cu 2+ , Zn 2+ etc., the treatment solution of this patent does not contain ingredients to remove these ion interferences, therefore, it is difficult to obtain a protective film with uniform color for this type of aluminum alloy

Method used

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Examples

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Effect test

specific Embodiment 1

[0063] Specific Example 1: Clean the surface of aluminum alloy 3A21 with gasoline, then immerse it in a 3% sodium hydroxide solution at a temperature of 30 to 60°C for 3 minutes for degreasing treatment, and then immerse the alloy in a 5% nitric acid solution at room temperature after washing with water 5 minutes, after rinsing with deionized water, then immerse the surface of the aluminum alloy at room temperature to quickly form a film of hexavalent chromium chemical conversion replacement solution. The composition of the chemical conversion liquid is 0.10 g / L of sodium silicate, 0.5 g / L of titanyl sulfate, 0.5 g / L of hydrogen peroxide, 1 g / L of aluminum sulfate, and 5 g / L of sodium fluoride. Sulfuric acid is used to adjust the pH of the conversion liquid to 2-8, and the temperature is 15-20°C. After reacting for 10 minutes, the aluminum alloy is taken out and washed with water to dry. The formed film has passed the 336-hour neutral salt spray test (ASTM B117) test, and the ...

specific Embodiment 2

[0064] Specific embodiment 2: After the aluminum alloy LD2CS is subjected to the same pretreatment as in Example 1, the alloy is immersed in 0.05g / L sodium silicate, 2g / L titanyl sulfate, hydrogen peroxide 0.5g / L, chlorinated In the conversion solution of cerium 2g / L and sodium fluoride 4g / L, sulfuric acid adjusts the pH value of the solution. The reaction conditions are the same as in Example 1. The aluminum alloy LD2CS treated above has formed a layer of white film layer after 336 hours of neutral salt spray (ASTM B117) test and still does not rust. Glue hard.

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Abstract

The present invention discloses one kind of normal temperature fast filming fluid for aluminum alloy surface and its usage. The filming fluid contains silicate, titanate, peroxide, fluoride and trivalent metal salt. When it is used, the filming fluid is controlled to be in the temperature of 1-40 deg.c and pH value of 2-8, and to be contacted with aluminum alloy for 1-10 min. The filming fluid can form film with high anticorrosive performance and excellent adhering performance, and has less environmental pollution, fast filming speed, low production cost and capacity of being used in industrial production.

Description

technical field [0001] The invention relates to a method for surface treatment of aluminum alloys, in particular to a metal surface chemical conversion solution that does not contain hexavalent chromium, which can quickly endow the aluminum alloy surface with superior corrosion resistance and adhesion performance under normal temperature conditions, and the use of the chemical conversion solution A method for treating the surface of an aluminum alloy. Background technique [0002] Chromate chemical transformation (passivation) of metal surface is a traditional processing technology, which has been widely used in functional coating and decorative coating fields for nearly a century due to its excellent anti-corrosion and adhesion properties, such as aerospace , electronics, automobiles, pharmaceuticals, printing, machinery, chemicals, food processing and other manufacturing industries. [0003] In the past, the surface treatment method of aluminum and its alloys was treated ...

Claims

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Application Information

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IPC IPC(8): C23C22/05C23C22/34C23C22/66C23C22/68C23C22/78
CPCC23C22/34C23C2222/10C23C22/68
Inventor 郭瑞光耿志良杨杰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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