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Method for anticorrosion treatment on surface of magnesium alloy material

A technology for anti-corrosion treatment and magnesium alloy, which is applied in the coating process of metal materials, the device for coating liquid on the surface, the plating of superimposed layers, etc. Achieve good corrosion resistance, simple process and low cost

Active Publication Date: 2010-04-21
SURFACE ENGINEERING RESEARCH CENTER OF NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing surface treatment methods for magnesium alloys mainly include chemical conversion, anodic oxidation, micro-arc oxidation, metal coating, organic coating, thermal spraying aluminum and vapor deposition, etc. On the basis of some magnesium alloy surface treatment methods, other process methods are added, which invisibly leads to complicated anti-corrosion treatment processes on the surface of magnesium alloys, and the operation procedures are numerous.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] AZ91D magnesium alloy was selected as the sample for anti-corrosion treatment on the surface of the magnesium alloy material. The treatment process was: degreasing → hot water washing → first cold water washing → pickling → second cold water washing → third cold water washing → activation → chemical Nickel plating→electroplating amorphous nickel tungsten phosphorus→fourth cold water washing→first drying→spraying epoxy primer→spraying topcoat→second drying finished product.

[0033] The specific process of anti-corrosion treatment on the surface of magnesium alloy materials is as follows:

[0034] ① Degreasing: Put the AZ91D magnesium alloy sample to be treated in the heated degreasing solution for ultrasonic degreasing for 10 minutes, and keep the temperature of the degreasing solution at 65°C during the ultrasonic degreasing process.

[0035] In this specific embodiment, the preparation process of degreasing solution is: take NaOH, NaOH 2 CO 3 Two components, the con...

Embodiment 2

[0058] AZ91D magnesium alloy was selected as the sample for anti-corrosion treatment on the surface of the magnesium alloy material. The treatment process was: degreasing → hot water washing → first cold water washing → pickling → second cold water washing → third cold water washing → activation → chemical Nickel plating→electroplating amorphous nickel tungsten phosphorus→fourth cold water washing→first drying→spraying epoxy primer→spraying topcoat→second drying finished product.

[0059] The specific process of anti-corrosion treatment on the surface of magnesium alloy materials is as follows:

[0060]① Degreasing: Put the AZ91D magnesium alloy sample to be treated in a heated degreasing solution for ultrasonic degreasing for 15 minutes, and keep the temperature of the degreasing solution at 75°C during the ultrasonic degreasing process.

[0061] In this specific embodiment, the preparation process of degreasing solution is: take NaOH, NaOH 2 CO 3 Two components, the concen...

Embodiment 3

[0084] AZ91D magnesium alloy was selected as the sample for anti-corrosion treatment on the surface of the magnesium alloy material. The treatment process was: degreasing → hot water washing → first cold water washing → pickling → second cold water washing → third cold water washing → activation → chemical Nickel plating→electroplating amorphous nickel tungsten phosphorus→fourth cold water washing→first drying→spraying epoxy primer→spraying topcoat→second drying finished product.

[0085] The specific process of anti-corrosion treatment on the surface of magnesium alloy materials is as follows:

[0086] ① Degreasing: Put the AZ91D magnesium alloy sample to be treated in the heated degreasing solution for ultrasonic degreasing for 12 minutes, and keep the temperature of the degreasing solution at 70°C during the ultrasonic degreasing process.

[0087] In this specific embodiment, the preparation process of degreasing solution is: take NaOH, NaOH 2 CO 3 Two components, the con...

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Abstract

The invention discloses a method for the anticorrosion treatment on the surface of a magnesium alloy material, which comprises the following steps of: completely removing an oxide film layer on the surface of the magnesium alloy material through acid washing; and forming an anticorrosion treatment layer on the surface of the magnesium alloy material through the process steps of chemical nickel-plating, electric plating of amorphous nickel-tungsten-phosphorus, spray coating of an epoxy primer, spray coating of a finishing paint and the like. Particularly, the sprayed epoxy primer is an epoxy coating containing superfine flake metal powder, and the epoxy coating eliminates a small amount of pinholes on the surface of the magnesium alloy material after the treatment, can effectively prevent a corrosive medium from penetrating into a matrix of the magnesium alloy material, can effectively ensure that the magnesium alloy material has good corrosion resistance because the epoxy primer has metal powder of which the electric potential is lower than that of the nickel-tungsten-phosphorus and nickel and can be corroded in preference to a nickel-tungsten-phosphorus plated layer and a nickel plated layer; and simultaneously, the treatment process steps are simplified, and the pollution to the environment and injuries to operators are reduced. The method has the advantages of simple process, convenient operation and low cost.

Description

technical field [0001] The invention relates to a treatment method for the surface of a magnesium alloy material, in particular to an anticorrosion treatment method for the surface of a magnesium alloy material. Background technique [0002] Magnesium is the metal element with the lowest density among all structural metals and alloy materials, and it is abundant and widely distributed in the earth's crust, and its content accounts for about 2.35% of the earth's weight. Pure metal magnesium is rarely used as a structural material, but magnesium alloy is a good lightweight structural material. Compared with other metal structural materials, it has many excellent physical and mechanical properties, and has higher specific strength and specific strength. Rigidity, good thermal conductivity and electrical conductivity, can withstand large shock and vibration loads, strong shock absorption, electromagnetic shielding and radiation resistance, easy cutting, casting, good recycling p...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C18/32C23C18/18C23C18/36C25D3/12C23G1/12B05D1/38
Inventor 郑顺奇朱利萍倪杨易更鲁闯吕绯
Owner SURFACE ENGINEERING RESEARCH CENTER OF NINGBO
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