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A kind of preparation method of magnesium alloy surface composite film layer

A surface composite, magnesium alloy technology, applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of low density of phosphate film, weakened corrosion resistance, etc., to meet the requirements of environmental protection and reliability Effects of continuous development, short production times, improved surface quality and corrosion resistance

Active Publication Date: 2018-01-12
青岛海骊准晶新材料科技有限公司
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  • Application Information

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Problems solved by technology

However, the phosphate film layer has low density and is relatively thin, and the micropores in the film layer will weaken its corrosion resistance, and its corrosion resistance performance needs to be improved to meet production applications.

Method used

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  • A kind of preparation method of magnesium alloy surface composite film layer
  • A kind of preparation method of magnesium alloy surface composite film layer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1. The material is the shell of the hand electric drill head.

[0024] Grind and load the shell of the electric drill head.

[0025] Degreasing: Immerse the shell in a sodium hydroxide degreasing tank with a mass percentage of 8% and a temperature of 75°C, and use ultrasonic waves for 20 minutes to make the oil, alkaline solution and surface active substances undergo saponification and emulsification reactions and dissolve in the In water, in order to achieve the purpose of degreasing, it can be clearly seen that the surface of the shell becomes bright. Afterwards, enter the first distilled water washing tank, apply ultrasonic waves at room temperature for 40 seconds, remove the alkaline solution and grease molecules remaining on the surface of the shell, take it out and dry it with hot air.

[0026] Pickling: Then immerse the casing in a pickling tank filled with 50g / L hydrofluoric acid and 40g / L ethylene glycol, and use ultrasonic waves at room temperature f...

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Abstract

The invention relates to a preparation method of a magnesium alloy surface composite film, which comprises the following steps: (1) sanding and feeding a magnesium alloy component; (2) carrying out degreasing, ultrasonic treatment, acid washing, alkali washing and other pretreatment techniques; and (3) carrying out modification treatment, ultrasonic treatment, film preparation, sintering and other composite film forming techniques. The composite film has more smooth, compact and uniform surface topography than the single barium phosphate film, and has better corrosion resistance than the single barium phosphate film. The method solves the problems of low solution stability, nonuniform conversion film, high shedding tendency and the like in the treatment process. The method is simple and convenient to operate, has high universality, and is applicable to any magnesium alloy material surface treatment. The whole process does not use any chromic acid or cyanide, and thus, is pollution-free, thereby satisfying the requirements for environmental protection and sustainable development in practical production. The method is simple in technique, can easily form an automatic production line, does not need high equipment investment, and has the advantage of short time for forming productive capacity.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a method for performing chemical composite treatment on the surface of magnesium alloy materials. Background technique [0002] Magnesium alloys have attracted widespread attention due to their small specific gravity, good biocompatibility and many other advantages. But because magnesium is very active, the problem of corrosion resistance seriously limits its further promotion and application. In the anti-corrosion technology of magnesium alloy surface, phosphate conversion technology has become a hot topic because of its advantages of simple process, low cost and convenient operation. L.Kouisni and others studied the phosphating coating on AM60 magnesium alloy, David Hawke et al. conducted phosphate-permanganate treatment on AM60B magnesium alloy, L.Y.Niu studied the zinc phosphate conversion coating, Zhao Ming et al. studied AZ91D In the multi-element composite film (ME...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/12C23C18/00
CPCC23C18/04C23C18/1254
Inventor 金华兰赖勇来杨湘杰郭洪民
Owner 青岛海骊准晶新材料科技有限公司
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