Surface treatment method for rare earth magnesium alloy product

Abstract

The invention provides a surface treatment method for a rare earth magnesium alloy product. The method comprises the following steps: (1) preparing surface treatment liquid: in preparation equipment of the surface treatment liquid, preparing water and a rare earth sulfate into an aqueous solution; then, adding magnesium oxide into the rare earth sulfate aqueous solution; and then, adding any one or two of aluminum sulfate and zinc sulfate into the solution to prepare the surface treatment liquid; (2) carrying out surface pre-treatment on the rare earth magnesium alloy product; (3) carrying out electrochemical oxidation-chemical deposition coupling technique: in an electrochemical oxidation-chemical deposition treatment reactor, carrying out the electrochemical oxidation-chemical deposition coupling technique on the surface of the rare earth magnesium alloy product; and (4) carrying out surface post-treatment on the rare earth magnesium alloy product. A corrosion-resistant, antioxidant, flame-retardant, smooth and compact protective film is generated on the surface of the rare earth magnesium alloy product.

Description

technical field [0001] The invention belongs to the field of rare earth magnesium alloy product manufacturing technology and material surface treatment technology, and particularly relates to a rare earth magnesium alloy product surface treatment method. Background technique [0002] Magnesium alloy products have been widely used in aerospace, automotive, electronics, machinery, military, etc. and the nuclear industry. However, due to the high chemical activity of magnesium, the standard equilibrium potential is very negative (-2.36V), and the resulting problems of corrosion resistance, flame retardancy and oxidation resistance of the products have become the main bottleneck restricting the wide application of magnesium and its alloys. Therefore, improving the corrosion resistance, flame retardancy and oxidation resistance of rare earth magnesium alloys has important application value. [0003] Since the late 1980s, with the application of magnesium alloys in the aviation ...

AI Technical Summary

Problems solved by technology

However, it is still difficult to meet the requirements for use under harsh conditions in practical applications

[0011](2) The existing rare earth magnesium alloy electrochemical oxidation-chemical deposition coupling technology also generally suffers from unstable performance of the surface treatment solution: affecting the performance of the rare earth magnesium alloy anodic oxide film There are many factors, such as: surface treatment liquid composition and concentration, power supply type and parameters, pH value, temperature, film forming time, stirring method and intensity, etc.

The traditionally used rare earth magnesium alloy electrochemical oxidation-chemical deposition coupling technology contains chromium, fluorine, cyanide, etc., which seriously endanger human health and the ecological environment, and restrict the production and application of surface treatment fluids

[0012](3) The application of rare earth magnesium alloy anodic oxidation is restricted and the production process is not easy to control: the existing environment-friendly rare earth magnesium alloy electrochemical oxidation-chemical deposition coupling technology is also common There are problems such as unstable surface treatment liquid, difficult control of the production process, and insignificant improvement in the corrosion resistance, flame retardancy and oxidation resistance of rare earth magnesium alloys, which restrict the application of anodic oxidation of rare earth magnesium alloys.

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