Method for preparing high-corrosion-resistance colored passivating film on surface of aluminum alloy

An aluminum alloy surface, high corrosion resistance technology, applied in the direction of metal material coating process, etc., can solve the problems of reducing production efficiency, difficulty, and long film formation time, so as to improve production efficiency, improve corrosion resistance, and shorten production costs. The effect of membrane time

Active Publication Date: 2013-09-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these patented technologies have certain practical prospects, they all have some shortcomings, mainly as follows: 1) Most of the passivation films of titanium and zirconium are colorless, which is difficult to distinguish with the naked eye, w...

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  • Method for preparing high-corrosion-resistance colored passivating film on surface of aluminum alloy
  • Method for preparing high-corrosion-resistance colored passivating film on surface of aluminum alloy
  • Method for preparing high-corrosion-resistance colored passivating film on surface of aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0033] The method for preparing a highly corrosion-resistant colored passivation film on the surface of an aluminum alloy in this embodiment comprises the following steps:

[0034] (1) Pretreatment of the aluminum alloy surface: grinding the aluminum alloy surface to 1000#, followed by industrial pickling and mixed acid treatment;

[0035] Described industrial pickling is specifically:

[0036] Place the aluminum alloy in an acidic solution at 25°C for 1 minute, the composition of the acidic solution is 100g / L H 2 SO 4 , 20mL / L H 3 PO 4 , 0.3g / L OP-10, 6mL / L HF.

[0037] The mixed acid treatment is specifically:

[0038] The aluminum alloy was placed in a mixed acid solution at 25°C and immersed for 1 minute. The mixed acid solution consisted of 10%wt nitric acid, 2.5%wt phosphoric acid and 1.5%wt sulfuric acid.

[0039] (2) Dip the aluminum alloy treatment solution treated in step (1) at 30°C for 10 seconds to obtain a yellow passivation film containing zirconium, titan...

Embodiment 2

[0042] The method for preparing a highly corrosion-resistant colored passivation film on the surface of an aluminum alloy in this embodiment comprises the following steps:

[0043] (1) Pretreatment of the aluminum alloy surface: grinding the aluminum alloy surface to 1000#, followed by industrial pickling and mixed acid treatment;

[0044] Described industrial pickling is specifically:

[0045] Place the aluminum alloy in an acidic solution at 35°C for 3 minutes, the composition of the acidic solution is 100g / L H 2 SO 4 , 20mL / L H 3 PO 4 , 0.3g / L OP-10, 6mL / L HF.

[0046] The mixed acid treatment is specifically:

[0047] The aluminum alloy was placed in a mixed acid solution at 35°C and immersed for 3 minutes. The mixed acid solution consisted of 10%wt nitric acid, 2.5%wt phosphoric acid and 2%wt sulfuric acid.

[0048] (2) Dip the aluminum alloy treatment solution treated in step (1) at 30°C for 60s to obtain a yellow passivation film containing zirconium, titanium and...

Embodiment 3

[0051] The method for preparing a highly corrosion-resistant colored passivation film on the surface of an aluminum alloy in this embodiment comprises the following steps:

[0052] (1) Pretreatment of the aluminum alloy surface: grinding the aluminum alloy surface to 1000#, followed by industrial pickling and mixed acid treatment;

[0053] (2) Dip the aluminum alloy treatment solution treated in step (1) at 50°C for 100s to obtain a yellow passivation film containing zirconium, titanium and vanadium on the surface of the aluminum alloy; the composition of the aluminum alloy treatment solution is as follows :

[0054]

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Abstract

The invention discloses a method for preparing a high-corrosion-resistance colored passivating film on the surface of aluminum alloy. The method comprises the following steps of: (1) pretreating the surface of the aluminum alloy; and (2) placing the aluminum alloy treated in the step (1) in conditioning fluid, and impregnating at a constant temperature for a period of time to obtain the yellow passivating film containing zirconium, titanium and vanadium on the surface of aluminum alloy. The aluminum alloy conditioning fluid comprises the following components: 0.1g/L-20g/L of fluotitanic acid, 0.1g/L-30g/L of fluozirconic acid, 0.2g/L-40g/L of sodium metavanadate and 0.1g/L-20g/L of tannic acid. The film generated by the method has a color, is convenient to observe and can rapidly form the passivating film with high corrosion resistance.

Description

technical field [0001] The invention relates to an aluminum alloy surface chemical passivation treatment method, in particular to a method for preparing a highly corrosion-resistant Ti / V colored passivation film on the aluminum alloy surface. Background technique [0002] Aluminum alloy has become the second largest metal material in use after steel. However, the aluminum alloy has high activity and is easy to corrode, so it is necessary to carry out anti-corrosion treatment on the surface. The commonly used method is to form a complete, dense and uniform passivation film on the surface of the aluminum alloy and then spray it. At present, the most widely used passivation method is low-concentration chromate (about 0.2% dichromate or chromic anhydride) passivation, the main reason is that the passivation process is simple, the cost is low, and the formed film has excellent corrosion resistance. performance and self-healing ability. However, conventional chromate passivatio...

Claims

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Application Information

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IPC IPC(8): C23C22/44
Inventor 李文芳左茜穆松林杜军
Owner SOUTH CHINA UNIV OF TECH
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