Remixed nanometer zinc sulfide tin molybdate conversion liquid for magnesium alloy surface treatment and application method thereof

A nano-zinc sulfide and surface treatment technology, which is applied in the coating process of metal materials, etc., can solve the problems of difficulty in meeting engineering requirements, poor corrosion resistance of conversion coatings, and high requirements for process operations, so as to achieve fast film formation and prevent agglomeration and sedimentation , Good anti-corrosion performance

Inactive Publication Date: 2017-05-31
巢湖云海镁业有限公司
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Problems solved by technology

At present, the commonly used chemical treatment solutions for magnesium alloys mainly include chromate, permanganate, phosphate, permanganate-phosphate and other solution systems. Among them, the process of chromate conversion coating is the most mature, but hexavalent chromium is a high Carcinogens are currently banned from use. Although other types of treatment solutions are more environmentally friendly to a certain extent, the conversion coatings formed have problems such as poor corrosion resistance and cracks in the film layer, which are difficult to meet engineering needs.
In order to improve these defects in the chemi

Method used

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Example Embodiment

[0019] A tin molybdate conversion solution of compound nano zinc sulfide used for surface treatment of magnesium alloys. The conversion solution is prepared from the following parts by weight of raw materials: sodium pyrophosphate 5, potassium stannate 20, sodium molybdate 20, Sodium fluoride 1, tannic acid 1, carboxy-terminated hyperbranched polyether 3, nano zinc sulfide 1, deionized water, and glacial acetic acid.

[0020] The conversion solution is prepared by the following steps:

[0021] (1) Mix sodium pyrophosphate with a small amount of deionized water, stir to completely dissolve, and the resulting solution is ready for use;

[0022] (2) Mix potassium stannate with a small amount of deionized water, stir to make it completely dissolved, and the resulting solution is ready for use;

[0023] (3) Mix sodium molybdate with a small amount of deionized water, stir to make it completely dissolved, and the resulting solution is ready for use;

[0024] (4) Mix sodium fluoride with a sm...

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Abstract

The invention discloses remixed nanometer zinc sulfide tin molybdate conversion liquid for magnesium alloy surface treatment. The conversion liquid selects tin acid salt and sodium molybdate as a main film forming agent, and uses sodium pyrophosphate, sodium fluoride, tannic acid and the like as assistants; nanometer zinc sulfide is added as a corrosion resistant assistance; and terminal carboxyl hyperbranched polyether water solution is used as a medium to obtain an uniform-dispersed nanometer zinc sulfide sol system for effectively preventing agglomeration and precipitation of nanometer materials in the system to achieve efficient modifying effect; the prepared conversion liquid has such advantages as fast film forming speed and high environmental protecting performance; and a conversion film formed on the surface of a magnesium alloy has such advantages as good corrosion resistance and surface compatibility, meanwhile, is unique in photoelectric performance, and further improves the use performance of the magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a tin molybdate conversion solution of complex nano-zinc sulfide used for magnesium alloy surface treatment and a use method thereof. Background technique [0002] Magnesium alloy is a lightweight, high-strength metal material. Products with the same strength can even be lighter than plastics. Its ability to withstand impact loads is greater than that of aluminum alloys. At the same time, magnesium alloys also have good processing performance, fast heat dissipation, Anti-seismic, anti-electromagnetic wave, recyclable and other advantages are widely used in aerospace, 3C products, sports equipment and other fields. Especially in recent years, 3C products have gradually developed in the direction of thinner and shorter, making high-performance magnesium alloys more favored by manufacturers. . [0003] Although magnesium alloys have the above advantages, d...

Claims

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Application Information

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IPC IPC(8): C23C22/44
CPCC23C22/44
Inventor 王青锋丁守君
Owner 巢湖云海镁业有限公司
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