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Surface treatment method of rear-earth magnesium alloy casting product

An alloy casting and surface treatment technology, applied in the direction of metal material coating process, etc., can solve the problems of accelerated substrate corrosion, complex process and high cost

Active Publication Date: 2015-05-20
YANGZHOU FENG MING METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the electrode potential of the coating metal is much higher than that of magnesium, if the coating has perforation, it will accelerate the corrosion of the substrate.
Moreover, such a process is complex and costly, and is only suitable for processing parts with simple shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The surface treatment method of a kind of rare earth magnesium alloy casting product of the present invention, comprises the following steps successively:

[0025] (1) Surface pre-treatment of rare earth magnesium alloy castings: After machining and heat treatment, the rare earth magnesium alloy castings are subjected to degreasing and mechanical impurity removal treatment, and then the magnesium hydroxide alkaline aqueous solution with a pH value of 8 is used to remove the surface of the rare earth magnesium alloy castings. grease, and then immerse the rare earth magnesium alloy casting in the sulfuric acid aqueous solution with a pH value of 1 for 1min.

[0026] (2) Prepare surface treatment solution: Dissolve cerium sulfate powder in water to obtain cerium sulfate aqueous solution with cerium sulfate molar concentration of 0.02mol / L.

[0027] (3) Surface modification of rare earth magnesium alloy castings: inject the aqueous solution of cerium sulfate in step (2) int...

Embodiment 2

[0030] The surface treatment method of a kind of rare earth magnesium alloy casting product of the present invention, comprises the following steps successively:

[0031] (1) Pre-treatment of the surface of rare earth magnesium alloy castings: the rare earth magnesium alloy castings are subjected to mechanical processing and heat treatment for degreasing and mechanical impurity removal, and then the magnesium hydroxide alkaline aqueous solution with a pH value of 10 is used to remove the surface of the rare earth magnesium alloy castings. grease, and then immerse the rare earth magnesium alloy casting in the sulfuric acid aqueous solution with a pH value of 3 for 3 minutes.

[0032] (2) Prepare surface treatment solution: Dissolve cerium sulfate powder in water to obtain cerium sulfate aqueous solution with cerium sulfate molar concentration of 0.08mol / L.

[0033] (3) Surface modification of rare earth magnesium alloy casting products: inject the cerium sulfate aqueous solutio...

Embodiment 3

[0036] The surface treatment method of a kind of rare earth magnesium alloy casting product of the present invention, comprises the following steps successively:

[0037] (1) Surface pre-treatment of rare earth magnesium alloy castings: after machining and heat treatment, the rare earth magnesium alloy castings are subjected to degreasing and mechanical impurity removal treatment, and then the magnesium hydroxide alkaline aqueous solution with a pH value of 11 is used to remove the surface of the rare earth magnesium alloy castings. grease, and then immerse the rare earth magnesium alloy casting in the sulfuric acid aqueous solution with a pH value of 5 for 5 minutes.

[0038] (2) Prepare surface treatment solution: Dissolve cerium sulfate powder in water to obtain cerium sulfate aqueous solution with cerium sulfate molar concentration of 0.12mol / L.

[0039] (3) Surface modification of rare earth magnesium alloy castings: inject the cerium sulfate aqueous solution in step (2) ...

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PUM

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Abstract

The invention relates to a surface treatment method of a rear-earth magnesium alloy casting product. The surface treatment method sequentially comprises the following steps of: immersing the rear-earth magnesium alloy casting product in 0.02mol / L-0.12mol / L of cerium sulfate aqueous solution in an ultrasonic precipitating-crystallizing device after carrying out oil-removing and impurity-removing pre-treatment onto the rear-earth magnesium alloy casting product; adding a magnesium hydroxide solution to regulate the pH value to 8-11; adding hydrogen peroxide to generate cerium hydroxide, wherein the mass percentage concentration of the hydrogen peroxide is 5%-20%, and the weight ratio of the using amount of the hydrogen peroxide to the cerium hydroxide aqueous solution is (1-5):100; generating a precipitated and crystallized compact tetravalent cerium protective film on the surface of the rear-earth magnesium alloy casting product by the cerium hydroxide under the ultrasonic action; and getting out the rear-earth magnesium alloy casting product from the precipitating-crystallizing device, and drying at 120 DEG C to 240 DEG C after water-washing to obtain the rear-earth magnesium alloy casting product coated with cerium dioxide on the surface. The surface treatment method of the rear-earth magnesium alloy casting product can be used for forming a compact tetravalent cerium protective film on the surface of the rear-earth magnesium alloy casting product; moreover, the process is simple and reliable.

Description

technical field [0001] The invention relates to a surface treatment method for a rare earth magnesium alloy casting product, and belongs to the technical field of rare earth magnesium alloy material manufacturing. Background technique [0002] Magnesium alloy has become the material of choice for the lightweight development of the equipment manufacturing industry due to its light weight, excellent structural performance, and easy recycling. In particular, the extensive application of auto parts and the demand for the development of telecommunication products in the direction of light, thin, short, and small, The development of this emerging material presents an extremely optimistic prospect. With the breakthrough of magnesium alloy application technology, the global consumption of magnesium alloy will grow rapidly at an annual rate of 20%. [0003] Since the late 1980s, with the application of magnesium alloys in the field of aviation and aerospace, the research on the appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/73C23C22/60
Inventor 张星眭怀明贺从波徐永峰
Owner YANGZHOU FENG MING METAL PROD
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