A Method of Improving the Corrosion Resistance of Magnesium Alloy Valves

A magnesium alloy and corrosion resistance technology, applied in the field of new material processing, can solve the problems of limited application of magnesium alloy valves, high notch sensitivity, poor corrosion resistance, etc., to inhibit electrochemical corrosion, curb pitting corrosion, and improve resistance. The effect of corrosion life

Active Publication Date: 2022-04-05
HEXIAN KEJIA VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since magnesium is a relatively active metal, its corrosion resistance is very poor, and it is highly sensitive to notches, which is easy to cause stress concentration, which greatly limits the application occasions of magnesium alloy valves.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for improving the corrosion resistance of magnesium alloy valves, the preferred solution is that the prepared corrosion-resistant coating material is co-electrodeposited with zinc ions on the magnesium alloy valve to be plated by the method of metal electrodeposition, forming a thickness of A dense layer of 10.0 microns, to obtain a composite coating, which acts as an inert anti-corrosion barrier;

[0019] Specifically, the following steps are included:

[0020] S1: Pretreatment of valve parts to be plated before composite electroplating: Polish the magnesium alloy valve with 150-mesh and 300-mesh sandpaper in sequence, then ultrasonically clean it in acetone solution for 10 minutes, and dry it in a vacuum oven at 70°C for 10 hours;

[0021] S2: Preparation of composite electroplating solution: Weigh 22 grams of zinc sulfate, dissolve it in 180 milliliters of phosphoric acid aqueous solution with a mass concentration of 4.0%, add 4.1 grams of the prepared corro...

Embodiment 2

[0026] A method for improving the corrosion resistance of magnesium alloy valves, the preferred solution is that the prepared corrosion-resistant coating material is co-electrodeposited with zinc ions on the magnesium alloy valve to be plated by the method of metal electrodeposition, forming a thickness of A dense layer of 11.0 microns, to obtain a composite coating, which acts as an inert anti-corrosion barrier;

[0027] Specifically, the following steps are included:

[0028] S1: Pretreatment of valve parts to be plated before composite electroplating: Grind the magnesium alloy valve with 150-mesh and 300-mesh sandpaper in sequence, then ultrasonically clean it in acetone solution for 12 minutes, and dry it in a vacuum oven at 75°C for 12 hours;

[0029] S2: Preparation of composite electroplating solution: Weigh 23 grams of zinc sulfate, dissolve it in 190 milliliters of phosphoric acid aqueous solution with a mass concentration of 4.5%, add 4.2 grams of the prepared corros...

Embodiment 3

[0034] A method for improving the corrosion resistance of magnesium alloy valves, the preferred solution is that the prepared corrosion-resistant coating material is co-electrodeposited with zinc ions on the magnesium alloy valve to be plated by the method of metal electrodeposition, forming a thickness of A dense layer of 12.0 microns, to obtain a composite coating, which acts as an inert anti-corrosion barrier;

[0035] Specifically, the following steps are included:

[0036] S1: Pretreatment of valve parts to be plated before composite electroplating: Polish the magnesium alloy valve with 150 mesh and 300 mesh sandpaper in sequence, then ultrasonically clean it in acetone solution for 15 minutes, and dry it in a vacuum oven at 80°C for 14 hours;

[0037] S2: Preparation of composite electroplating solution: Weigh 24 grams of zinc sulfate, dissolve it in 200 milliliters of phosphoric acid aqueous solution with a mass concentration of 5.0%, add 4.3 grams of the prepared corro...

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Abstract

The invention relates to the technical field of new material processing, and discloses a method for improving the corrosion resistance of magnesium alloy valves. The prepared corrosion-resistant coating material is co-electrodeposited with zinc ions to the magnesium alloy valves to be plated by metal electrodeposition. On the workpiece, a dense layer with a thickness of 10.0-12.0 microns is formed to obtain a composite coating, which acts as an inert anti-corrosion barrier, prevents corrosion, remains stable in acidic media, can withstand the test of general high temperature, and reduces stress corrosion. Sensitivity, can inhibit the occurrence of electrochemical corrosion, the invention can significantly improve the corrosion resistance of magnesium alloy valves, solve the problems of high porosity and unstable protective properties of corrosion-resistant coatings for existing magnesium alloy valves, and have no pollution The waste liquid is produced without toxicity, and the economic and social benefits are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of new material processing, and in particular relates to a method for improving the corrosion resistance of a magnesium alloy valve. Background technique [0002] The density of magnesium alloy is 23% of steel, 67% of aluminum, and 170% of plastic. It is the lightest metal in metal structural materials. The yield strength of magnesium alloy is roughly equivalent to that of aluminum alloy, only slightly lower than that of carbon steel. It is plastic 4-5 times. my country is a famous magnesium-producing country in the world. The production capacity, output and export of primary magnesium rank first in the world. The total amount of magnesite resources reaches 3.145 billion tons, ranking first in the world. In 2001, the export volume reached 200kt, accounting for the world's magnesium market. More than 40% of the total demand. However, the quality of raw magnesium in my country is poor, the quality of magnesiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D7/00C25D5/42
CPCC25D15/00C25D7/00C25D5/42
Inventor 黎宏
Owner HEXIAN KEJIA VALVE CASTING
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