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Chemical oxidation method of surfaces of aluminum and aluminum alloys

A technology of aluminum alloy surface and chemical oxidation, which is applied in the direction of metal material coating technology, etc., to achieve the effect of meeting functional requirements, good electrical conductivity, and good protection performance

Inactive Publication Date: 2012-04-04
ZHENGZHOU AIRCRAFT EQUIP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

When the surface of some aluminum alloy electrical parts needs to have both protective function and conductive function, the conventional oxidation method often cannot meet its special requirements

Method used

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Embodiment Construction

[0008] The surface chemical oxidation method of aluminum and aluminum alloys of the present invention comprises the following steps:

[0009] 1. Degreasing process: use 50g / L~70g / L sodium phosphate (Na 3 PO 4 12H 2 O), 25g / L~35g / L sodium silicate (Na 2 SiO 3 10H 2 O), 3g / L~5g / L soap or 8g / L~12g / L synthetic washing powder and other degreasing solutions that do not corrode aluminum, clean the parts for 3min~15min at a temperature of 75℃~95℃, and degrease The quality is qualified if the continuous and uniform water film on the surface of the part does not break within 30s during the next process of water washing;

[0010] 2. One-time water washing process: clean the degreasing solution on the surface of the parts with clean and flowing tap water;

[0011] 3. One-time light extraction process: use 300g / L~500g / L nitric acid (HNO 3 ρ=1.42g / ml) solution to emit light on the above parts at room temperature, eliminate the natural oxide film formed on the surface of the parts in...

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Abstract

The invention discloses a chemical oxidation method of surfaces of aluminum and aluminum alloys. The chemical oxidation method comprises the following working procedures of: oil removal, primary water-washing, primary bright-dipping, alkaline corrosion, secondary bright-dipping, conductive oxidation, secondary water-washing and drying, wherein a solution used in the conductive oxidation working procedure comprises the following component of: 3-7g / L of chromic anhydride, 1-4g / L of sodium fluoride and 0.5-2g / L of potassium ferricyanide, the solution temperature is 15-60 DEG C and the oxidation time is 5-20min. The chemical oxidation method disclosed by the invention has the advantages that: in the oxidation process, the solution is prepared according to the proportions of the chromic anhydride to the sodium fluoride to the potassium ferricyanide of (3-7): (1-4): (0.5-2(g / L)), the solution temperature is controlled at 15-60 DEG C, and the oxidation time is controlled to 5-20min, therefore protection layers generated on the surfaces of aluminum and aluminum alloy parts and component not only have better protection performance, but also have favorable electric conduction function and meet functional requirements of multiple products.

Description

technical field [0001] The invention relates to a method for surface oxidation of aluminum and aluminum alloys, in particular to a method for chemical surface oxidation of aluminum and aluminum alloys. Background technique [0002] The surface of aluminum and aluminum alloy generally needs to be oxidized to produce an oxide film for surface protection. Commonly used oxidation treatment methods are divided into chemical oxidation and electrochemical oxidation. Generally, the formed oxide film layer is non-conductive. When the surface of some aluminum alloy electrical parts needs to have both protective function and conductive function, the conventional oxidation method often cannot meet its special requirements. This kind of protective layer with special requirements is often applied to products that require electromagnetic shielding for electrical components, and is also used for aluminum alloy parts that require conductive functions due to component technology and structur...

Claims

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Application Information

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IPC IPC(8): C23C22/37C23C22/73
Inventor 杨全胜薛卫东
Owner ZHENGZHOU AIRCRAFT EQUIP
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