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Preparation method of metal protective coating

A metal protection and coating technology, which is applied in coatings, chemical instruments and methods, cleaning methods and utensils, etc., can solve problems such as structural defects and complex processes of micro-arc oxidation coatings that cannot be fundamentally solved, and achieve structural changes Defects, simple operation, and the effect of improving overall performance

Active Publication Date: 2022-05-06
CRRC QINGDAO SIFANG CO LTD
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Problems solved by technology

However, the process of these post-treatment methods is relatively complicated, and cannot fundamentally solve the structural defects of the micro-arc oxidation coating, which is sparse on the outside and dense on the inside.

Method used

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  • Preparation method of metal protective coating

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Embodiment 1

[0034] This embodiment provides a kind of method that adopts micro-arc oxidation technology to prepare metal protective coating, such as figure 1 shown, including the following steps:

[0035] (1) AZ31 magnesium alloy substrate 1 is subjected to a conventional micro-arc oxidation in the electrolyte;

[0036] The composition of the electrolyte is: 20g / L NaSiO 3 9H 2 O, 2g / L KOH, 2g / L NaF, 1g / L NaVO 3 2H 2 O.

[0037] The operating conditions of micro-arc oxidation are: the power supply adopts bipolar pulse power supply, constant current mode, pulse frequency is 500Hz, duty cycle is 20%, and current density is 10A / dm 2 , the circulating water cooling temperature is 20°C, and the oxidation time is 15min.

[0038] After a conventional micro-arc oxidation treatment, a micro-arc oxidation coating 2 is obtained on the surface of the AZ31 magnesium alloy substrate 1; the micro-arc oxidation coating 2 is composed of an inner dense area 4 and an outer loose area 3;

[0039] Among t...

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Abstract

The invention relates to the technical field of preparation of metal protective coatings, in particular to a preparation method of a metal protective coating based on laser cleaning stripping-micro-arc oxidation. The preparation method of the metal protective coating provided by the invention comprises the following steps: stripping an outer loose region of a micro-arc oxidation coating by using a laser cleaning technology, and carrying out secondary micro-arc oxidation on the surface of an exposed inner compact region. According to the method, the laser cleaning technology is applied to the micro-arc oxidation coating preparation process for the first time, through the laser selective stripping effect, the formed composite treatment micro-arc oxidation coating is more compact in structure compared with a traditional micro-arc oxidation coating, especially the inner side compact area is thicker, and the micro-arc oxidation coating is more compact in structure. Therefore, the wear resistance and corrosion resistance of the obtained composite-treated micro-arc oxidation coating are remarkably improved, and the technical bottlenecks that the outer side area of the coating obtained through a traditional micro-arc oxidation process is loose in structure and thick in layer, and the inner side area of the coating is compact in structure and thin in layer are solved.

Description

technical field [0001] The invention relates to the technical field of metal protective coating preparation, in particular to a method for preparing a metal protective coating based on laser cleaning stripping-micro-arc oxidation. Background technique [0002] Micro-arc oxidation, also known as "surface ceramization" and "micro plasma oxidation", is a high-voltage oxidation method developed on the basis of anodic oxidation. [0003] In the process of micro-arc oxidation treatment, the metal to be treated (usually aluminum, magnesium, titanium and other valve metals and their alloys) is connected to the anode of the power supply and placed in the electrolyte, and the low-voltage stage begins. The surface of the workpiece is first anodized to produce oxides ; When the voltage continues to increase, the metal surface oxide is broken down by the high voltage to generate arc discharge, and the high temperature generated by the arc discharge melts the metal surface, and reacts wit...

Claims

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Application Information

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IPC IPC(8): C25D11/30B08B7/00
CPCC25D11/026C25D11/024C25D11/30B08B7/0042
Inventor 刘勇韩晓辉江涣梁赛郝森
Owner CRRC QINGDAO SIFANG CO LTD
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