Magnesium alloy surface chromium-free formation solution and processing technique thereof

A technology for chemical formation treatment and magnesium alloy, applied in the direction of metal material coating process, etc., can solve the problems of toxicity of hexavalent chromium, environmental pollution, non-compliance with environmental protection requirements, etc., and achieves less environmental pollution, simple and easy-to-obtain raw materials, and corrosion resistance. good effect

Inactive Publication Date: 2008-06-04
MITAC PRECISION TECH(KUNSHAN) CORP
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Problems solved by technology

At present, one of the commonly used surface protection technologies for magnesium alloys is chromate treatment: the protective film is obtained by chemical treatment with an aqueous solution of chromic anhydride acid and dichromate as the main components. Although the process is mature and the performance is stable, due to the Hexavalent chromium is poisonous, causing serious pollution to the environment and does not meet environmental protection requirements. The use of chromium has been banned worldwide

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  • Magnesium alloy surface chromium-free formation solution and processing technique thereof

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Embodiment Construction

[0014] Prepare magnesium alloy surface chromium-free forming solution according to the following formula:

[0015] Water-soluble cerium salt 8g

[0016] Nitrate 2g

[0017] Ammonium sulfate 10g

[0018] see figure 1 , which shows the process flow of chemical conversion treatment on the surface of magnesium alloy by using the chromium-free chemical conversion solution of the present invention.

[0019] As shown in the figure, the process flow is: degreasing→water washing→acid activation→pure water washing→surface adjustment→pure water washing→chemical conversion treatment→pure water washing→drying.

[0020] Specifically, the surface of the AZ91D magnesium alloy sample was degreased, washed with water, and then activated with an organic acid selected from acetic acid, oxalic acid, oxalic acid, and benzoic acid. After washing with industrial pure water, use alkaline surface conditioner for surface adjustment, and then carry out chemical conversion treatment after industrial p...

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Abstract

The invention provides a non-chromium conversion solution for magnesium alloy surfaces which takes the water as the solvent. Each liter of the solution comprises: water-soluble cerium salt of 1 to 15g, nitrate of 2 to 12g and ammonium sulfate of 2 to 12g. For the process using the non-chromium formation solution to make surface treatment to the magnesium alloy, the process flow is as follows: degreasing, bath, acid activation, pure bath, surface conditioning, pure bath, conversion treatment, pure bath and drying; wherein, the concrete procedures of the conversion treatment in the process flow are that: the magnesium alloy workpiece made a pre-treatment is dipped into the non-chromium conversion solution for treatment, the working temperature of the workpiece is between 20 and 85 DEG C, the conversion treatment time is between 20 seconds to 5 minutes. With the non-chromium conversion solution for magnesium alloy surfaces of the invention and the conversion process thereof, the obtained membrane has good corrosion resistance, can meet the requirement of environmental protection, has low raw material cost, is simple and easy to obtain, has the formula without heavy metal ions and phosphor elements as well as simple waste water treatment.

Description

【Technical field】 [0001] The invention relates to a chemical formation solution and a chemical formation treatment process thereof, in particular to a chromium-free surface formation solution of a magnesium alloy and a chemical formation treatment process thereof. 【Background technique】 [0002] Magnesium alloys are widely used in industrial fields such as automobiles and electronic communications because of their low specific gravity, high strength, and suitability for recycling. It can be used only after an anti-corrosion film layer is formed on its surface. [0003] There are two commonly used chemical conversion coating treatment methods for magnesium alloys: one is phosphate film formation, and the other is chromate film formation. At present, one of the commonly used surface protection technologies for magnesium alloys is chromate treatment: the protective film is obtained by chemical treatment with an aqueous solution of chromic anhydride acid and dichromate as the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05C23C22/78C23C22/82
Inventor 郑子仁杨升攀熊丹
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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