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Magnesium or magnesium alloy corrosion-resistant hydrophobic plasma electrolytic oxidation solution

A plasma and electrolytic oxidation technology, which is applied in the direction of anodic oxidation, can solve the problems of easy formation of cavities and cracks, low surface hardness, and easy corrosion, etc., and achieve the effect of smooth surface, strong corrosion resistance and stable process

Inactive Publication Date: 2015-04-29
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ceramic layer coatings formed by these technologies are all magnesium oxide or hydroxide-based ceramic coatings, with loose texture, low surface hardness, brittleness, and easy formation of cavities and cracks in the coating. Corrosion prone to water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepared with deionized water, each liter of electrolyte contains 8g of sodium fluorozirconate and 1.2g of sodium dihydrogen phosphate.

[0022] Preparation method: in deionized water, first add fluorozirconium sodium salt, fully stir to dissolve completely, then add sodium dihydrogen phosphate, fully stir to dissolve completely, and it is ready.

Embodiment 2

[0024] Prepared with deionized water, each liter of electrolyte contains 18 g of sodium fluorozirconate and 0.3 g of sodium dihydrogen phosphate.

[0025] The preparation method is the same as in Example 1.

Embodiment 3

[0027] It is prepared with deionized water, and each liter of electrolyte contains 13 g of sodium fluorozirconate and 0.75 g of sodium dihydrogen phosphate.

[0028] The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention relates to a magnesium or magnesium alloy corrosion-resistant hydrophobic plasma electrolytic oxidation solution which is prepared from deionized water. Every liter of electrolyte contains 6-20g of fluozirconate, and 0.1-1.5g of sodium dihydrogen phosphate, 0.1-2.5g of disodium hydrogen phosphate or 0.1-1.5g of phosphoric acid. The electrolyte is free of Cr<6+>, and can enhance the corrosion resistance, hydrophobicity and binding force with the substrate of the obtained coating.

Description

Technical field [0001] The invention relates to an electrolytic oxidizing solution for coating a surface coating, in particular to a corrosion-resistant hydrophobic plasma electrolytic oxidizing solution of magnesium or magnesium alloy. Background technique [0002] Magnesium and magnesium alloys have been widely used in industries such as automobiles, aerospace, electronics, military, and nuclear energy due to their unique comprehensive properties such as low density, high specific strength and specific stiffness, and good shock absorption and electromagnetic shielding properties. However, magnesium is more active in nature and is easily corroded in the air. Therefore, when magnesium alloy is used as a structure and shell material, reliable surface protection measures must be adopted. Plasma electrolytic oxidation is a technology for in-situ growth of ceramic oxide coating on the surface of light metal. This is completely different from the starting point of other ceramic coati...

Claims

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Application Information

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IPC IPC(8): C25D11/30
CPCC25D11/30
Inventor 王丽付文吴世逵
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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