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Method for in-situ preparation of layered double hydroxide anticorrosive coatings on surfaces of magnesium and magnesium alloys

A hydroxide, anti-corrosion technology, used in coatings, electrolytic coatings, etc., can solve problems such as poor corrosion resistance and achieve good biocompatibility

Active Publication Date: 2019-08-06
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Since layered double hydroxide coatings show great application prospects in the field of corrosion resistance of metal materials, in order to solve the problem of poor corrosion resistance of existing magnesium and its alloy materials, the purpose of the present invention is to propose a The method for constructing a layered double hydroxide anti-corrosion coating in situ on the surface of its alloy comprises: first preparing a hydroxide coating of the metal A element on the surface of magnesium and its alloys, and then chemically transforming the obtained metal A element The hydroxide coating is converted into a layered double hydroxide corrosion-resistant coating (Mg / A layered double hydroxide); the A element in the hydroxide coating of the metal A element is Fe, Mn One, preferably the hydroxide coating of the metal A element is iron oxyhydroxide (FeO(OH)), or manganese oxyhydroxide (MnO(OH))

Method used

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  • Method for in-situ preparation of layered double hydroxide anticorrosive coatings on surfaces of magnesium and magnesium alloys
  • Method for in-situ preparation of layered double hydroxide anticorrosive coatings on surfaces of magnesium and magnesium alloys
  • Method for in-situ preparation of layered double hydroxide anticorrosive coatings on surfaces of magnesium and magnesium alloys

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Experimental program
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Embodiment 1

[0038] (a) use the ferric nitrate solution of absolute ethanol configuration 1.00g / L, as electrolyte;

[0039] (b) Magnesium alloy is used as the cathode, graphite is used as the anode, the voltage is 120V, and the time is 1min;

[0040] (c) The electrodeposited sample is subjected to hydrothermal treatment in pure water, the temperature of the hydrothermal treatment is 90° C., and the time is 6 h. X-ray diffraction analysis showed that LDH phase was formed on the coating surface. The comparison of polarization curves shows that the LDH coating significantly improves the corrosion resistance of the samples.

Embodiment 2

[0042] (a) use the ferric nitrate solution of absolute ethanol configuration 1.00g / L, as electrolyte;

[0043] (b) Magnesium alloy is used as the cathode, graphite is used as the anode, the voltage is 120V, and the time is 2min;

[0044] (c) The electrodeposited sample is subjected to hydrothermal treatment in pure water, the temperature of the hydrothermal treatment is 105° C., and the time is 5 hours. X-ray diffraction analysis showed that LDH phase was formed on the coating surface. The comparison of polarization curves shows that the LDH coating significantly improves the corrosion resistance of the samples.

Embodiment 3

[0046] (a) use the ferric nitrate solution of absolute ethanol configuration 1.00g / L, as electrolyte;

[0047] (b) Magnesium alloy is used as the cathode, graphite is used as the anode, the voltage is 120V, and the time is 3min;

[0048] (c) The electrodeposited sample is subjected to hydrothermal treatment in pure water, the temperature of the hydrothermal treatment is 105° C., and the time is 5 hours. X-ray diffraction analysis showed that LDH phase was formed on the coating surface. The comparison of polarization curves shows that the LDH coating significantly improves the corrosion resistance of the samples.

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Abstract

The invention relates to a method for in-situ preparation of layered double hydroxide anticorrosive coatings on the surfaces of magnesium and magnesium alloys. The method comprises the steps that hydroxide coatings of a metal A element are prepared on the surfaces of the magnesium and the magnesium alloys, and the hydroxide coatings of the metal A element are converted into the layered double hydroxide anticorrosive coatings through chemical conversion; and the A element of the hydroxide coatings of the metal A elements is one of Fe and Mn, and preferably, the hydroxide coatings of the metal Aelements are hydroxyl oxidized iron (FeO(OH) or manganese oxyhydroxide (MnO(OH).

Description

technical field [0001] The invention relates to a method for surface modification of magnesium and its alloy materials, in particular to a method for constructing metal hydroxides (for example, (FeO(OH)) or (MnO(OH))) on the surface of materials by electrochemical deposition , and further carry out hydrothermal treatment on the sample after electrochemical deposition in water to form a surface modification method of layered double hydroxide anti-corrosion coating, which belongs to the technical field of metal material surface modification. Background technique [0002] The density of magnesium is 1.738g / cm 3 , which is a lightweight metal material, has good noise absorption, shock absorption and radiation protection properties. Therefore, magnesium and its alloy materials play an important role in the aerospace industry, military industry, and transportation. In addition, in the field of medical metal materials, magnesium and its alloys are expected to become the next gene...

Claims

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Application Information

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IPC IPC(8): C25D9/12C25D5/48
CPCC25D5/48C25D9/12
Inventor 刘宣勇张冬冬
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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