Micro-arc oxidation electrolyte for preparing high-corrosion-resistance and high-wear-resistance coating on surface of magnesium alloy and preparation method and application of micro-arc oxidation electrolyte

A technology of micro-arc oxidation and wear-resistant coating, which is applied in the field of electrolyte, can solve the problems of environmental pollution raw material prices, low corrosion resistance, and low porosity, and achieve low price, enhanced corrosion resistance and wear resistance, and reduced The effect of microcracks

Inactive Publication Date: 2021-01-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the coating prepared by the existing method has low corrosion resistance or is easy to cause environmental pollution and expensive raw materials. AZ91 alloy is used as the base material, and sodium metaaluminate, sodium silicate, sodium phosphate and hydrogen Sodium oxide / potassium hydroxide is used as the basic electrolyte, sodium dodecylbenzenesulfonate is used as an anionic surfactant, and inexpensive zirconium silicate is used as an additive to provide a magnesium alloy surface prepared by micro-arc oxidation with high corrosion resistance and wear resistance The electrolyte formula of the coating and its preparation method and application are used to prepare a micro-arc oxidation film layer with dense structure, low porosity, good corrosion resistance, tight combination with the substrate, and excellent protection performance on the AZ91 alloy

Method used

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  • Micro-arc oxidation electrolyte for preparing high-corrosion-resistance and high-wear-resistance coating on surface of magnesium alloy and preparation method and application of micro-arc oxidation electrolyte
  • Micro-arc oxidation electrolyte for preparing high-corrosion-resistance and high-wear-resistance coating on surface of magnesium alloy and preparation method and application of micro-arc oxidation electrolyte
  • Micro-arc oxidation electrolyte for preparing high-corrosion-resistance and high-wear-resistance coating on surface of magnesium alloy and preparation method and application of micro-arc oxidation electrolyte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Pretreatment

[0019] The AZ91 alloy samples were sequentially polished with SiC sandpaper to remove the oxide skin on the surface until the surface of the samples was smooth and showed a bright metallic luster. Then place the sample in acetone and ultrasonically clean it for 10 min to remove oil and fine particles on the surface of the sample. Then rinse with absolute ethanol, and finally dry with cold wind to obtain the sample to be treated by micro-arc oxidation.

[0020] 2) Configure the electrolyte

[0021] Mix 2g / L sodium metaaluminate, 1g / L sodium silicate, 4g / L sodium phosphate, 6g / L sodium hydroxide with water to form an electrolyte, stir with a high-speed stirring device to keep the electrolyte uniform precipitation.

[0022] 3) Setting parameters

[0023] Prepared in constant voltage mode, positive voltage 400V, negative voltage 30V, current frequency 600Hz, positive duty ratio 30%, negative duty ratio 10%, processing time 10min, reaction temperature c...

Embodiment 2

[0029] 1) Pretreatment

[0030] The AZ91 alloy samples were sequentially polished with SiC sandpaper to remove the oxide skin on the surface until the surface of the samples was smooth and showed a bright metallic luster. Then place the sample in acetone and ultrasonically clean it for 10 min to remove oil and fine particles on the surface of the sample. Then rinse with absolute ethanol, and finally dry with cold wind to obtain the sample to be treated by micro-arc oxidation.

[0031] 2) Configure the electrolyte

[0032] Mix 1g / L sodium silicate, 4g / L sodium phosphate, 6g / L sodium hydroxide, 1g / L sodium dodecylbenzenesulfonate and 15g / L zirconium silicate with water to form an electrolyte, Stir with a high stirring device to keep the electrolyte even and free of precipitation.

[0033] 3) Setting parameters

[0034] Prepared in constant voltage mode, positive voltage 400V, negative voltage 30V, current frequency 600Hz, positive duty ratio 30%, negative duty ratio 10%, pro...

Embodiment 3

[0040] 1) Pretreatment

[0041] The AZ91 alloy samples were sequentially polished with SiC sandpaper to remove the oxide skin on the surface until the surface of the samples was smooth and showed a bright metallic luster. Then place the sample in acetone and ultrasonically clean it for 10 min to remove oil and fine particles on the surface of the sample. Then rinse with absolute ethanol, and finally dry with cold wind to obtain the sample to be treated by micro-arc oxidation.

[0042] 2) Configure the electrolyte

[0043] Mix 1g / L sodium silicate, 4g / L sodium phosphate, 6g / L sodium hydroxide, 1g / L sodium dodecylbenzenesulfonate and 25g / L zirconium silicate with water to form an electrolyte, Stir with a high stirring device to keep the electrolyte even and free of precipitation.

[0044] 3) Setting parameters

[0045] Prepared in constant voltage mode, positive voltage 400V, negative voltage 30V, current frequency 600Hz, positive duty ratio 30%, negative duty ratio 10%, pro...

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Abstract

The invention discloses a micro-arc oxidation electrolyte for preparing a high-corrosion-resistance and high-wear-resistance coating on the surface of a magnesium alloy and a preparation method and application of the micro-arc oxidation electrolyte. The electrolyte is formed by adding 0.5-50 g / L of additive zirconium silicate and 0.5-5 g / L of anionic surfactant sodium dodecyl benzene sulfonate onthe basis of one to three kinds in 1-50 g / L of sodium metaaluminate, 1-50 g / L of sodium silicate, 1-50 g / L of sodium phosphate and 0.5-20 g / L of one kind in sodium hydroxide and potassium hydroxide. ZrO2 and SiO2 decomposed from zirconium silicate in the micro-arc oxidation process provide a heterogeneous nucleation core for forming a ceramic coating, ZrO2 is used as a ceramic toughening phase, and formation of defects such as microcracks in a film layer can be reduced. Undecomposed zirconium silicate particles can also play a role in hole sealing, the thickness, density and hardness of a micro-arc oxidation film and the combination degree of the micro-arc oxidation film and a base body are increased, and therefore the corrosion resistance and wear resistance of the coating are greatly improved. In addition, compared with direct addition of ZrO2 and SiO2, the electrolyte taking zirconium silicate as the additive has the cost advantage of being low in cost.

Description

technical field [0001] The invention belongs to the technical field of micro-arc oxidation, and relates to an electrolytic solution for preparing a highly corrosion-resistant and wear-resistant ceramic coating on the surface of a magnesium alloy and an application method thereof. Background technique [0002] Micro-arc oxidation is through the combination of electrolyte and corresponding electrical parameters, on the surface of aluminum, magnesium, titanium and other metals and their alloys, relying on the instantaneous high temperature and high pressure generated by arc discharge, in situ growth of ceramic films mainly composed of matrix metal oxides Floor. The coating prepared by micro-arc oxidation technology has the advantages of firm combination with the substrate, compact structure, high toughness, simple technical process, easy operation and less environmental pollution. It is a new green and environment-friendly material surface treatment technology, which has broad...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 陈民芳陈国瑞由臣
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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