A kind of surface treatment method of rare earth magnesium alloy product

Abstract

The invention provides a method for surface treatment of rare earth magnesium alloy products, which comprises the following steps in turn: (1) surface treatment liquid preparation: in the surface treatment liquid preparation equipment, water and rare earth sulfate are prepared into an aqueous solution, and then the above rare earth sulfuric acid is added Add magnesium oxide to the brine solution, then add any one or two of aluminum sulfate or zinc sulfate to the above solution to prepare a surface treatment solution; (2) surface pretreatment of rare earth magnesium alloy products; (3) electrochemical oxidation ‑Chemical deposition coupling technology treatment: In the electrochemical oxidation-chemical deposition surface treatment reactor, the electrochemical oxidation-chemical deposition coupling technology treatment is performed on the surface of rare earth magnesium alloy products; (4) After-treatment of the surface of rare earth magnesium alloy products. Form a corrosion-resistant, anti-oxidation, flame-retardant, smooth and dense protective film on the surface of rare earth magnesium alloy products.

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 ...

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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 liquid: there are many factors that affect the performance of the rare earth magnesium alloy anodic oxidation film, such as: surface treatment liquid composition and concentration, power supply Types 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 anodic oxidation of rare earth magnesium alloys is restricted and the production process is not easy to control: the existing environment-friendly electrochemical oxidation-chemical deposition coupling technology of rare earth magnesium alloys also generally suffers from unstable surface treatment liquids, difficult control of the production process, and difficulty in controlling rare earth magnesium alloys. The corrosion resistance, flame retardancy and oxidation resistance of alloys are not significantly improved, which restricts the application of anodic oxidation of rare earth magnesium alloys

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