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Black chromium-free conversion film treatment agent for ADC12 pressure casting aluminum alloy and surface treatment method for ADC12 pressure casting aluminum alloy

A technology of ADC12 and cast aluminum alloy, which is applied in the direction of metal material coating process, etc., can solve the problems of poor environmental protection, pollution, environmental pollution, etc.

Active Publication Date: 2019-01-11
广东东明新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese invention patent application CN89104371.3 discloses a method for chemical oxidation treatment of the surface of aluminum and its alloys by using a chemical oxidation treatment solution composed of chromic anhydride, fluoride, potassium ferricyanide, surfactants, rare elements, etc. After oxidation, the oxide film of aluminum alloy is rice yellow. Because the oxide film formed by this method is chromate, chromium and its compounds will cause serious environmental pollution, and the environmental protection is poor. Therefore, the method of chemical oxidation treatment mentioned above has pollution limited by the problem

Method used

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  • Black chromium-free conversion film treatment agent for ADC12 pressure casting aluminum alloy and surface treatment method for ADC12 pressure casting aluminum alloy
  • Black chromium-free conversion film treatment agent for ADC12 pressure casting aluminum alloy and surface treatment method for ADC12 pressure casting aluminum alloy
  • Black chromium-free conversion film treatment agent for ADC12 pressure casting aluminum alloy and surface treatment method for ADC12 pressure casting aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A surface treatment method for ADC12 die-casting aluminum alloy, which comprises the steps of:

[0065] (1) Put the ADC12 die-casting aluminum alloy into the degreasing agent for degreasing and degreasing treatment. The degreasing agent includes each component of the following concentrations: sodium pyrophosphate 10 g / L, sodium tripolyphosphate 20 g / L, sodium metasilicate 5 g / L, sodium gluconate 2 g / L, OP-10 emulsifier 1.25 g / L, K12 anionic active agent 1 g / L. The temperature of the degreasing treatment is 60 degrees centigrade, and the treatment time is 6 minutes. After washing with water, put it into the whitening solution below for whitening treatment.

[0066] (2) Putting the ADC12 die-casting aluminum alloy after the degreasing and degreasing treatment into a whitening agent for whitening treatment. The whitening agent is A434 environmental protection whitening agent, which is produced by Dongming Chemical Industry in Boluo County. After washing with water, put...

Embodiment 2

[0071] Different from Example 1, the ADC12 die-casting aluminum alloy black chrome-free conversion film treatment agent comprises the components of the following concentrations: 5 milliliters / liter of 85% phosphoric acid; 5 grams / liter of ammonium molybdate (sodium); 15 grams of ammonium bifluoride / liter; nickel nitrate hexahydrate (cobalt) 3 g / liter; dispersant 0.01 ~ 0.05 ml / liter, the balance is water.

Embodiment 3

[0073] Different from Example 1, the ADC12 die-casting aluminum alloy black chrome-free conversion coating treatment agent comprises the components of the following concentrations: 2 ml / liter of 85% phosphoric acid; 10 grams / liter of ammonium molybdate (sodium); 5 grams of ammonium bifluoride / liter; nickel (cobalt) nitrate hexahydrate 5 g / liter; dispersant 0.01 ~ 0.05 ml / liter, the balance is water.

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Abstract

The invention relates to a black chromium-free conversion film treatment agent for an ADC12 pressure casting aluminum alloy and a surface treatment method for the ADC12 pressure casting aluminum alloy. The conversion film treatment agent is prepared from the following components with concentrations as follows: 1-15 ml / L phosphoric acid, 1-15 g / L molybdate, 1-15 g / L ammonium hydrogen fluoride, 1-5g / L nickel nitrate hexahydrate, a 0.01-0.05 ml / L dispersant and the balance of water. The black chromium-free conversion film treatment agent for the ADC12 pressure casting aluminum alloy can form a black conversion film on the surface of the ADC12 pressure casting aluminum alloy and the conversion film has the advantages of being good in adhesive force, high in degree of corrosion resistance, good in salt spray resistance property and good in film forming uniformity, and can improve the corrosion resistance and the film adhesive force of the surface of the ADC12 pressure casting aluminum alloy. The black chromium-free conversion film treatment agent is free of chromium and does not pollute the environment, so that the black chromium-free conversion film treatment agent is relatively goodin environment-friendly property.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to an ADC12 die-casting aluminum alloy black chrome-free conversion film treatment agent and a surface treatment method for ADC12 die-casting aluminum alloy. Background technique [0002] As a widely used industrial material, ADC12 die-casting aluminum alloy is widely used in various industries such as aerospace, automobiles, precision instruments, etc. widespread attention. Due to the low surface hardness of aluminum alloy, it is easy to be worn, therefore, surface treatment is often required after aluminum parts are processed. In the prior art, the most common surface treatment is a chemical oxidation method using an oxidation treatment solution. For example, Chinese invention patent application CN89104371.3 discloses a method for chemical oxidation treatment of the surface of aluminum and its alloys by using a chemical oxidation treatment solution composed of ch...

Claims

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Application Information

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IPC IPC(8): C23C22/44C22C21/02
CPCC22C21/02C23C22/44
Inventor 熊猛易金彪况金权
Owner 广东东明新材科技有限公司
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