Method for preparing magnesium and magnesium alloy surface coating

A magnesium alloy and coating technology, which is applied in the field of preparation of magnesium and magnesium alloy surface coatings, can solve the problems of unsatisfactory coating effects, complicated procedures, and high costs, and achieve the effects of excellent performance, simplified procedures, and compact structure

Inactive Publication Date: 2011-03-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of complicated procedures, high cost, heavy pollution, unsatisfactory plating effect and the like existing in the existing plating technology, and provides a method for preparing magnesium and magnesium alloy surface coatings based on micro-arc oxidation plating pretreatment

Method used

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  • Method for preparing magnesium and magnesium alloy surface coating
  • Method for preparing magnesium and magnesium alloy surface coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare 2L of NaF solution with distilled water at a concentration of 40g / L to obtain a micro-arc oxidation electrolyte. Prepare the electroless plating solution according to the formulation requirements of No. 01 plating process in Table 1, and adjust the pH value of the plating solution to 6.0. The AZ91D, AM60B and pure magnesium samples processed by wire cutting into 50mm×50mm×2mm were respectively polished with water sandpaper from coarse to fine until the appearance was uniform and smooth, and rinsed and scrubbed with absolute ethanol after connecting with the wire, and then rinsed with distilled water Then immersed in the micro-arc oxidation electrolyte at room temperature, and treated with sinusoidal alternating current constant voltage 200V micro-arc oxidation for 2 minutes. After taking it out, rinse it with tap water and distilled water in sequence, then immerse in the plating solution whose temperature is controlled at 80±2°C, and apply electroless plating fo...

Embodiment 2

[0032] Except that the micro-arc oxidation electrolyte was changed to 100g / L sodium phosphate solution, and the micro-arc oxidation condition was changed to a sinusoidal AC constant voltage of 150V for 60min, the others were the same as in Example 1.

[0033] A complete coating with a uniform, smooth appearance and a gray metallic sheen is obtained. OM and SEM carried out surface and cross-sectional observations, and found that the coating structure is dense and there are no obvious defects. According to GB / T13913-92 thermal shock test and file test, the results show that the bonding force is good.

Embodiment 3

[0035] Except that the micro-arc oxidation electrolyte was changed to 5g / L sodium fluoride and 20g / L sodium phosphate solution, and the micro-arc oxidation condition was changed to sinusoidal alternating current constant voltage 250V for a treatment time of 1min, the others were the same as in Example 1.

[0036] A complete coating with a uniform, smooth appearance and a gray metallic sheen is obtained. OM and SEM carried out surface and cross-sectional observations, and found that the coating structure is dense and there are no obvious defects. According to GB / T13913-92 thermal shock test and file test, the results show that the bonding force is good.

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Abstract

The present invention discloses a magnesium and magnesium alloy surface cladding preparation method which comprises the following procedures: a) the surface is cleaned up; b) electrolyte for micro-arc oxidation is a water-based solution, wherein, the concentration of sodium fluoride is between 1 g / L and 40 g / L; the concentration of sodium phosphate is between 1 g / L and 100 g / L; the sodium fluoride and the sodium phosphate can be used separately or in a combined way, or sodium hydroxide with the concentration between 0.05 g / L and 10 g / L is further added to use; c) the surface is treated bychemical plating and / or d) electroplating; water cleaning is only required among the procedures. The invention based on the knowledge of the related mechanism of plating technology and micro-arc oxidation technology makes the best of the advantages in particular that the micro-arc oxidation ceramic film has the characteristics of corrosion resistance and porosity, and combines the surface ceramictechnology and the surface alloy technology organically and solves the problems of complex working procedures, high cost, large pollution, imperfect effect, etc., in the prior plating art. With the method provided by the invention, a cladding with uniformity, smoothness, a compact structure and excellent performance can be achieved.

Description

technical field [0001] The invention belongs to the technical field of light alloy surface modification, and in particular relates to a preparation technology of magnesium and magnesium alloy surface coating. Background technique [0002] As we all know, in recent years, magnesium has been favored by all parties due to its advantages in resources, price and structural performance, and has the reputation of "green engineering materials in the 21st century". In many fields, especially in the fields where "lightweight" and "environmental protection" are of great significance or have special technical requirements, such as aerospace, automobile, electronics, communication, military, hardware and other industrial sectors, magnesium alloys have been obtained as structural materials. It has an unprecedented application, and its application space is still expanding, and its usage is growing rapidly. For example, the annual growth rate of magnesium alloy usage in the world is as high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C25D11/30C23C18/00C25D5/00
Inventor 张永君
Owner SOUTH CHINA UNIV OF TECH
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