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Magnesium alloy surface calcium series phosphorization solution and formation 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 non-compliance with environmental protection requirements, hexavalent chromium toxicity, environmental pollution, etc., and achieve the effects of less environmental pollution, low cost, and simple wastewater treatment.

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 calcium series phosphorization solution and formation processing technique thereof

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Embodiment Construction

[0015] Prepare magnesium alloy surface calcium system phosphating solution according to the following formula:

[0016] Monocalcium Phosphate 15g

[0017] Phosphoric acid 6ml

[0018] Nitrate 10g

[0019] Polyphosphate 1g

[0020] see figure 1 , which shows the process flow of using the calcium-based phosphating solution of the present invention to chemically treat the surface of a magnesium alloy.

[0021] 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.

[0022] 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 washi...

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Abstract

The invention provides a Ca-system phosphating solution for magnesium alloy surfaces which takes the water as the solvent. Each liter of the solution comprises: calcium biphosphate of 5 to 80 g, phosphoric acid of 2 to 15 ml, nitrate of 2 to 15 g and polyphosphate of 0.1 to 5 g. For the process using the Ca-system phosphating solution to make surface treatment to the magnesium alloy, the process flow is 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 Ca-system phosphating solution for treatment, the working temperature of the workpiece is between 20 and 35 DEG C, the conversion treatment time is between 20 seconds to 5 minutes. With the Ca-system phosphating 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; the conversion treatment can be made under room temperature without need to be heated, and has small energy consumption.

Description

【Technical field】 [0001] The invention relates to a phosphating solution and its chemical formation treatment process, in particular to a magnesium alloy surface calcium-based phosphating solution and its chemical formation treatment process. 【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 main components. Althou...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08C23C22/78C23G1/12C23G5/02
Inventor 郑子仁杨升攀熊丹
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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