Process for magnesium alloy surface micro-arc oxidation

A technology of micro-arc oxidation and magnesium alloy, which is applied in anodic oxidation and other directions, can solve the problems of uneven micro-arc oxidation ceramic film, poor corrosion resistance and wear resistance, small specific heat capacity of electrolyte, etc., and achieve low production cost and corrosion resistance Strong resistance to abrasion and easy handling

Inactive Publication Date: 2006-05-17
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of uneven micro-arc oxidation ceramic film, poor corrosion resistance and wear resistance, small specific heat capacity of electrolyte and high energy consumption in the micro-arc oxidation process in the existing micro-arc oxidation technology. A method of micro-arc oxidation on the surface of magnesium alloy

Method used

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  • Process for magnesium alloy surface micro-arc oxidation

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specific Embodiment approach 1

[0007] Specific embodiment one: this embodiment is carried out through the following steps: (one) magnesium alloy is carried out pretreatment; (two) preparation alkaline electrolyte: a. preparation alkaline silicate electrolyte: add 4 -30g silicate, 2-10g potassium fluoride, sodium fluoride, sodium silicofluoride or potassium silicofluoride, 1-10g potassium hydroxide or sodium hydroxide, 5-30mL ethylene glycol or glycerol; b. Preparation Alkaline aluminate electrolyte: add 4-30g aluminate, 2-10g potassium fluoride, sodium fluoride, sodium fluorosilicide or potassium fluorosilicide to 1L deionized water; (3) Put the pretreated magnesium alloy in Micro-arc oxidation in alkaline silicate electrolyte or alkaline aluminate electrolyte: direct current is applied, the voltage keeps rising, constant current, and the current density is 1-15A / dm 2 , The power-on time is 5-90min, and the electrolyte temperature is always kept below 40°C.

specific Embodiment approach 2

[0008] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step (1), magnesium alloy is put into the pickling solution that forms by the volume ratio of acid and deionized water 1: 2-1: 10 Pickling for 30s-3min.

specific Embodiment approach 3

[0009] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step (1), magnesium alloy is put into sulfuric acid pickling solution successively (concentration is that the sulfuric acid of 98% and deionized water volume ratio are 1: 3 ) and alkaline degreasing liquid for pretreatment, in which the soaking time for pickling is 30s-3min.

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Abstract

The present invention relates to a magnesium alloy surface microarc oxidation method. Said method includes the following steps: (1), pretreatment; (2), preparing alkaline silicate electrolyte or alkaline aluminate electrolyte; and (3), placing the pretreated magnesium alloy in the alkaline silicate electrolyte or alkaline aluminate electrolyte and making microarc oxidation; applying DC current, continuously rising voltage, constant current, current density is 1-15 A/sq.dm, galvanization time is 5-90 min and electrolyte temperature is less than 40 deg.C.

Description

technical field [0001] The invention relates to a method for alloy surface micro-arc oxidation. Background technique [0002] Magnesium is an extremely active metal, and its standard electrode potential is relatively negative (-2.36V, vs. SHE). When it is in contact with other metals with relatively positive potential in a humid atmosphere, it is very easy to produce contact corrosion. Moreover, due to the surface of magnesium alloy There is a cathodic phase composed of impurities, so electrochemical reactions are easily generated in a humid environment to form pitting corrosion. Micro-arc oxidation is a new technology for in-situ growth of ceramic films on the surface of aluminum, magnesium, titanium and other valve metals and their alloys, but the existing magnesium alloy micro-arc oxidation technology has many defects, such as: invention patent CN1369577A, its magnesium The micro-arc oxidation ceramic film on the surface of the alloy is uneven, and the corrosion resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 安茂忠郭洪飞
Owner HARBIN INST OF TECH
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