Magnesium alloy surface composite film and preparation method thereof

A surface composite and magnesium alloy technology, applied in the direction of surface reaction electrolytic coating, anodic oxidation, electrolytic coating, etc., can solve the problems of reduced precision of workpieces, low yield, environmental pollution, etc., and achieve small impact, fast speed, and simplified processing Process effect

Active Publication Date: 2019-11-29
HOHAI UNIV CHANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloy is easy to corrode due to its inherent chemical properties, and its anti-corrosion has become an important issue in its surface treatment.
[0003] The existing preparation method of composite film on the surface of magnesium alloy (Chinese patent application number: CN201510749871.8), first electroless plating the magnesium alloy in the nickel-containing plating solution, and then in the sewage electrodeposition solution containing cerium nitrate and stearic acid Electrodeposition reaction is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix nano-yttrium oxide powder and nano-silicon carbide powder at a weight ratio of 1:1, take 10 g of it and put it into 1 liter of 2% hydrofluoric acid solution, disperse and activate it with ultrasonic for 1-3 minutes, filter and clean it with deionized water, Immediately add 1 liter of deionized water, and then add 10 milliliters of dispersant to continue ultrasonic dispersion and activation for 1-3 minutes to obtain a nano-yttrium oxide and nano-silicon carbide solution. The dispersant is preferably tetramethylammonium hydroxide. Take 2 / 3 distilled water in a 10L tank, dissolve 4700g sodium hexametaphosphate and 3000g glycerol in sequence, after all the reagents in the tank are dissolved, pour 3000g potassium hydroxide into the tank solution under rapid stirring and mix evenly. Finally, 1 liter of the dispersed nano-yttrium oxide and nano-silicon carbide solution was poured into the tank until completely mixed, and finally water was added to 10 L to obtain an oxidati...

Embodiment 2

[0029] First, mix the nano-yttrium oxide powder and the nano-silicon carbide powder at a weight ratio of 1:1, take 10 g of it and put it into 1 liter of 2% hydrofluoric acid solution, disperse and activate it with ultrasound for 1 minute, filter and clean it with deionized water, and immediately Add 1 liter of deionized water, and then add 10 milliliters of dispersant tetramethylammonium hydroxide to continue ultrasonic dispersion for 3 minutes to obtain a nano-yttrium oxide and nano-silicon carbide solution. Take 2 / 3 of deionized water in a 10L tank, dissolve 5700g of hexamethylcyclotrisiloxane and 2000g of triethanolamine in turn, and after all the reagents in the tank are dissolved, pour 2000g of sodium hydroxide into it under rapid stirring In the tank solution, finally take 1 liter of dispersed nano-yttrium oxide and nano-silicon carbide solution and pour it into the tank until completely mixed, and finally add water to 10 L to obtain an oxidation electrolyte.

[0030] Pu...

Embodiment 3

[0035] First, mix the nano-yttrium oxide powder and nano-silicon carbide powder in a weight ratio of 1:1, take 10 g of it and place it in 1 liter of 2% hydrofluoric acid solution, disperse and activate it with ultrasonic for 2 minutes, filter and clean it with deionized water, and immediately Add 1 liter of deionized water, and then add 10 milliliters of dispersant tetramethylammonium hydroxide to continue ultrasonic dispersion and activation for 2 minutes to obtain a nano-yttrium oxide and nano-silicon carbide solution. Take 2 / 3 of distilled water in a 10L tank, dissolve 5200g of sodium hexametaphosphate and 2500g of glycerol in turn, and after all the reagents in the tank are dissolved, pour 2500g of potassium hydroxide into the tank under rapid stirring until completely Mix evenly, and finally take 1 liter of dispersed nano-yttrium oxide and nano-silicon carbide solution and pour it into a tank, add water to 10 L to obtain an oxidation electrolyte.

[0036] Put the magnesiu...

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PUM

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Abstract

The invention discloses a magnesium alloy surface composite film preparation method and belongs to the technical field of surface treatment. The magnesium alloy surface composite film preparation method comprises the following steps that an oxidation electrolyte solution is prepared; magnesium alloy is made to react with the oxidation electrolyte solution under nanosecond pulse with the voltage amplitude value being 500-800 V; and the oxidation electrolyte solution comprises meta-aluminate or phosphate, alkali, nano yttrium oxide powder and nano silicon carbide powder. The composite film preparation method provided by the invention is more environmentally friendly in preparation process, simple in process and low in cost. The invention further provides a magnesium alloy surface composite film, and the magnesium alloy surface composite film is obtained by adopting the magnesium alloy surface composite film preparation method and is capable of being wear resistant and corrosion resistant.

Description

technical field [0001] The invention relates to a magnesium alloy surface composite film and a preparation method thereof, belonging to the technical field of surface treatment. Background technique [0002] Magnesium alloy has the characteristics of high specific strength, high specific stiffness, high damping and good vibration reduction. However, magnesium alloy is easy to corrode due to its inherent chemical properties, and its anti-corrosion has become an important issue in its surface treatment. [0003] The existing preparation method of composite film on the surface of magnesium alloy (Chinese patent application number: CN201510749871.8), first electroless plating the magnesium alloy in the nickel-containing plating solution, and then in the sewage electrodeposition solution containing cerium nitrate and stearic acid Electrodeposition reaction is carried out in this method, although a super-hydrophobic composite film layer is obtained by this method, but due to the ...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D15/00
CPCC25D11/024C25D11/30C25D15/00
Inventor 蒋永锋包晔峰陈秉岩杨可
Owner HOHAI UNIV CHANGZHOU
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