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Method for silane reinforcing magnesium alloy cathode electrophoretic corrosion-proof layer

A technology for enhancing magnesium alloys and cathodic electrophoresis, which is applied to metal material coating processes, coatings, electrolytic coatings, etc. It can solve the problems of limited size and high cost of magnesium alloy samples, and achieve easy mass and automated production and production costs. Low, the effect of improving corrosion resistance

Inactive Publication Date: 2007-03-28
重庆工学院
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for silane-reinforced cathodic electrophoretic corrosion-resistant coating of magnesium alloy, which is treated with silane solution without heating or special equipment, and at the same time of enhancing the bonding force between cathodic electrophoretic paint and magnesium alloy substrate , to solve the problem of limited size and relatively high cost of plasma-treated magnesium alloy samples

Method used

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  • Method for silane reinforcing magnesium alloy cathode electrophoretic corrosion-proof layer

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Effect test

Embodiment 1AZ31

[0032] Example 1 AZ31 wrought magnesium alloy sample silane enhanced cathodic electrophoresis

[0033]Because the cathodic electrophoresis technology has requirements on the surface finish and cleanliness of the sample. Therefore, the surface pretreatment of the magnesium alloy is first required. The process route is: pre-cleaning → degreasing (alkaline washing) → hot water washing → cold water washing → pickling → water washing → silane treatment → drying. The alkaline washing solution is a mixed solution of 40g / L sodium hydroxide and 10g / L sodium phosphate decahydrate. The degreasing is carried out at 60~70℃. The alkaline time is 3min~30min according to the oil stain of the sample. The acid is carried out immediately after washing. Washing, pickling time depends on the surface roughness of the sample and the formula of the pickling solution, generally 30s to 3min. After pickling, rinse immediately to ensure that the surface is not oxidized, and then immerse the sample with silan...

Embodiment 2AZ91

[0041] Example 2 AZ91D magnesium alloy hand tool shell silane enhanced cathodic electrophoresis

[0042] Firstly, the surface pretreatment of the magnesium alloy is required. The process route is: pre-cleaning→degreasing (alkaline washing)→hot water washing→cold water washing→acid washing→water washing→silane treatment→drying. The alkaline washing solution is a mixed solution of 40g / L sodium hydroxide and 10g / L sodium phosphate decahydrate. Degreasing is carried out at 60-70°C. The alkaline time is 30 minutes according to the amount of oil stain on the sample. Pickling is carried out immediately after washing. The pickling time depends on the surface roughness of the sample and the formula of the pickling solution, generally 3 minutes. After pickling, rinse immediately to ensure that the surface is not oxidized, and then immerse the sample with silane. The silane is γ-glycidoxypropyltrimethoxysilane, the concentration is 2%, and the immersion time is 30s~90s. The immersion tempera...

Embodiment 3AZ91

[0050] Example 3 AZ91D magnesium alloy motorcycle parts silane enhanced cathodic electrophoresis

[0051] Firstly, the surface pretreatment of the magnesium alloy is required. The process route is: pre-cleaning→degreasing (alkaline washing)→hot water washing→cold water washing→acid washing→water washing→silane treatment→drying. The alkaline washing solution is a mixed solution of 40g / L sodium hydroxide and 10g / L sodium phosphate decahydrate. Degreasing is carried out at 60~70℃. The alkaline time is 15min according to the amount of oil stain on the sample. Pickling is carried out immediately after washing. The pickling time depends on the surface roughness of the sample and the formula of the pickling solution, generally 3min. Rinse immediately after pickling to ensure that the surface is not oxidized, and then immerse the sample with silane. The silane is acrylic triethoxysilane, the concentration is 2%, the immersion time is 90s, and the immersion temperature is normal temperatur...

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Abstract

The invention relates to a method of silence enhancing magnesium alloy cathode electrophoresis corrosion resistant coating layer. It takes silence enhancing process to the surface of magnesium alloy after cleaning. The silence solution adopts aqueous solution of 2-3 ethoxy, silicone base propyl tetrasulfide, propenyl-3-ethoxy silicane, gama- glycidol ether oxygen propyl-3-methoxyl silence or 2, 3 ethoxy silicone base ethane, and pH value is acidity. The method need not special device to heat, and combining with cathode electrophoresis, the binding power of cathode electrophoresis lacquer and magnesium alloy basal body would be enhanced.

Description

Technical field [0001] The invention relates to a corrosion resistance treatment technology for the surface of a magnesium alloy. Background technique [0002] Magnesium alloys have poor corrosion resistance, and various coatings are used to protect the magnesium alloy matrix from corrosive media. At present, anodizing treatment, chemical conversion treatment, electroplating, epoxy resin sealing, paint, enamel, etc. are commonly used. The coating of these surface treatments is relatively thin, and the corrosion resistance is limited to a certain extent. Both electroplating and anodizing are restricted by the size of the equipment. Eliminate the problem of waste liquid. Therefore, countries around the world have successively carried out research on surface treatment methods such as plasma micro-arc anodization, laser surface heat treatment, laser surface alloying, physical vapor deposition (PVD), chemical vapor deposition (CVD) or electron beam evaporation on magnesium alloy surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/00
CPCC25D13/20C23C2222/20
Inventor 张津吴超云黄福祥张微麻彦龙王莹
Owner 重庆工学院
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