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Preprocessing method of magnesium alloy electro-coating technology

A technology of electrophoretic coating and magnesium alloy, which is applied in the direction of metal material coating technology, electrolytic coating, electrophoretic plating, etc., can solve the problems of poor corrosion resistance and easy corrosion of magnesium, and achieve improved organizational structure, excellent anti-corrosion performance, Optimizing the effect of electrophoretic coating process

Inactive Publication Date: 2013-12-25
昆山纯柏精密五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, magnesium has poor corrosion resistance and is easily corroded during application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The pretreatment method of the magnesium alloy electrophoretic coating process provided in this embodiment includes steps:

[0018] (a) Use an aqueous solution of magnesium alloy degreasing powder to clean and remove the oil on the surface of the magnesium alloy workpiece; among them, the magnesium alloy degreasing powder is FG-02 type, and the cleaning time is 10 to 15 minutes;

[0019] (b) Use an aqueous solution of magnesium alloy pickling agent to clean and remove oxides on the surface of magnesium alloy workpieces; among them, the magnesium alloy pickling agent is FG-031 type, and the cleaning time is 3 to 5 minutes;

[0020] (c) Phosphate the magnesium alloy workpiece in a phosphating solution; the formula of the phosphating solution is: zinc oxide 15g / L, phosphoric acid 10ml / L, sodium fluoride 5g / L, sodium nitrate 12g / L, Ammonium molybdate 2g / L, hydroxylamine sulfate 4g / L, sodium lauryl sulfate 4g / L, the pH value of the phosphating solution is 3; the temperature ...

Embodiment 2

[0026] The pretreatment method of the magnesium alloy electrophoretic coating process provided in this embodiment includes steps:

[0027] (a) Use an aqueous solution of magnesium alloy degreasing powder to clean and remove the oil on the surface of the magnesium alloy workpiece; among them, the magnesium alloy degreasing powder is FG-02 type, and the cleaning time is 10 to 15 minutes;

[0028] (b) Use an aqueous solution of magnesium alloy pickling agent to clean and remove oxides on the surface of magnesium alloy workpieces; among them, the magnesium alloy pickling agent is FG-031 type, and the cleaning time is 3 to 5 minutes;

[0029] (c) Phosphate the magnesium alloy workpiece in a phosphating solution; the formula of the phosphating solution is: zinc oxide 20g / L, phosphoric acid 15ml / L, sodium fluoride 3g / L, sodium nitrate 10g / L, Ammonium molybdate 3g / L, hydroxylamine sulfate 8g / L, sodium lauryl sulfate 5g / L, the pH value of the phosphating solution is 5; the temperature ...

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Abstract

The invention discloses a preprocessing method of the magnesium alloy electro-coating technology. The preprocessing method comprises the step of carrying out phosphating processing on a magnesium alloy workpiece in a phosphating solution. The formula of the phosphating solution comprises the components of 15-20g / L of zinc oxide, 10-15ml / L of phosphoric acid, 3-5g / L of sodium fluoride, 10-12g / L of sodium nitrate, 2-3g / L of ammonium molybdate, 4-8g / L of hydroxylamine sulphate, and 4-5g / L of lauryl sodium sulfate. The PH value of the phosphating solution is 3-5, the temperature of the phosphating solution is 40-50DEG C, the phosphating time is 15-20 minutes, and 2-3g / L of nickel nitrate and 4-8g / L of manganous nitrate are further added into the phosphating solution. According to the preprocessing method, when phosphating processing is carried out on the magnesium alloy workpiece, the nickel salt and the manganese salt are added in the phosphating solution, therefore, the tissue structure of a phosphating film is effectively improved, the follow-up electro-coating technology is optimized, and the film obtained through the electro-coating technology has the excellent corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a pretreatment method of magnesium alloy electrophoretic coating process. Background technique [0002] Magnesium alloy has superior properties such as high specific strength, good machining performance, good shock absorption capacity, good thermal conductivity, good electromagnetic shielding performance, excellent hydrogen storage performance, high die-casting productivity, easy cutting, easy recycling, etc. It is a kind of performance Superior light metal structural materials, magnesium alloys, as high-quality alloy structural materials, are widely used in aerospace, automotive, electronics and medical equipment industries. [0003] However, magnesium has poor corrosion resistance and is easily corroded during application. There are many types of magnesium alloy corrosion, which can be divided into electrochemical corrosion, stress corrosion cracking, ...

Claims

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Application Information

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IPC IPC(8): C25D13/20C23C22/44
Inventor 黄海胜
Owner 昆山纯柏精密五金有限公司
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