Method for preparing hydrotalcite coating on magnesium alloy surface by combining acid pretreatment and steam method

An acid pretreatment, magnesium alloy technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of high cost, environmental pollution, the thickness of hydrotalcite coating is guaranteed and loose, etc., to slow down the corrosion rate, production process Environmental protection, the effect of increased thickness

Pending Publication Date: 2021-10-29
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the corrosion resistance of the composite film prepared by this preparation method is still not very satisfactory, and it cannot bring long-term protection to the magnesium alloy substrate.
[0005] At present, there has been some progress in the preparation of hydrotalcite coatings by the in-situ steam method, but the thickness of the prepared hydrotalcite coatings is guaranteed and loose, which cannot provide long-term effective protection for the substrate.
In addition, there are other methods, such as CN108330472A discloses a method for enhancing the corrosion resistance of LDH coatings on the surface of magnesium alloys, and CN112680090A discloses a method for preparing corrosion-resistant self-repairing coatings on the surface of magnesium alloys. Although these methods prepare The composite coating has excellent corrosion resistance, but it uses a lot of chemicals, the cost is high, and it is easy to pollute the environment. layers matter

Method used

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  • Method for preparing hydrotalcite coating on magnesium alloy surface by combining acid pretreatment and steam method
  • Method for preparing hydrotalcite coating on magnesium alloy surface by combining acid pretreatment and steam method
  • Method for preparing hydrotalcite coating on magnesium alloy surface by combining acid pretreatment and steam method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The substrate material is extruded magnesium alloy AZ31, and the steps for preparing hydrotalcite coating on the surface of extruded magnesium alloy AZ31 are as follows:

[0062] (1) Pretreatment of the surface of the extruded magnesium alloy AZ31: the extruded magnesium alloy AZ31 sample was polished to remove the surface oxide layer, and after there were no obvious burrs on the surface of the substrate, it was cleaned with an organic solvent and dried. Ethanol solution can be used;

[0063] (2) Carry out acid pretreatment to the magnesium alloy sample after step (1) pretreatment: prepare the citric acid solution of 30g / L, immerse the AZ31 magnesium alloy sample in the citric acid solution, take out after soaking for 30s, and then Cleaning and drying to obtain the magnesium alloy sample after acid pretreatment for subsequent use;

[0064] (3) Prepare hydrotalcite coating on the surface of magnesium alloy sample after acid pretreatment by in-situ steam method: suspend ...

Embodiment 2

[0067] The substrate material is extruded magnesium alloy AZ80, and the steps for preparing hydrotalcite coating on the surface of extruded magnesium alloy AZ80 are as follows:

[0068] (1) Pretreatment of the surface of the extruded magnesium alloy AZ80 substrate: take 4 magnesium alloy samples from the same magnesium alloy plate, grind the extruded magnesium alloy AZ80 sample to remove the surface oxide layer, and After the surface has no obvious burrs, clean it with an organic solvent and dry it;

[0069] (2) Carry out acid pretreatment to the magnesium alloy sample after the pretreatment of step (1): prepare 20g / L citric acid solution, immerse the extruded AZ80 magnesium alloy sample in the citric acid solution, and soak for 0s respectively (i.e. without acid pretreatment), take out after 10s, 20s, 30s, then clean and dry, obtain the magnesium alloy sample after acid pretreatment for subsequent use;

[0070] (3) The in-situ steam method was used to prepare hydrotalcite co...

Embodiment 3

[0075] The substrate material is extruded magnesium alloy AZ61, and the steps for preparing hydrotalcite coating on the surface of extruded magnesium alloy AZ61 are as follows:

[0076] (1) Pretreatment of the surface of the magnesium alloy substrate: the magnesium alloy sample is polished to remove the surface oxide layer, and after there are no obvious burrs on the surface of the substrate, it is cleaned with an organic solvent and dried;

[0077] (2) Carry out acid pretreatment to the magnesium alloy sample after step (1) pretreatment: prepare the citric acid solution of 20g / L, immerse the AZ61 magnesium alloy sample in the citric acid solution, take out after soaking for 40s, and then Cleaning and drying to obtain the magnesium alloy sample after acid pretreatment for subsequent use;

[0078] (3) Prepare hydrotalcite coating on the surface of magnesium alloy sample after acid pretreatment by in-situ steam method: suspend the magnesium alloy sample after citric acid pretrea...

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Abstract

The invention discloses a method for preparing a hydrotalcite coating on the surface of a magnesium alloy by combining acid pretreatment and a steam method, and mainly solves the technical problem that the corrosion resistance of a hydrotalcite coating in the prior art is not ideal. The method comprises the following steps: (1) pretreating the surface of a magnesium alloy matrix; (2) carrying out acid pretreatment on the pretreated magnesium alloy matrix; and (3) preparing the hydrotalcite coating on the surface of the magnesium alloy matrix subjected to acid pretreatment through an in-situ steam method, wherein an acid solution adopted in acid pretreatment is an organic weak acid solution, and the organic weak acid is at least one of oxalic acid, an acetic acid solution or citric acid. The hydrotalcite coating obtained by the invention has the characteristics of compact structure, strong adhesive force, good corrosion resistance and long service life.

Description

technical field [0001] The invention relates to the technical field of preparation of magnesium alloy surface coatings, in particular to a method for preparing hydrotalcite coatings on the surface of magnesium alloys by combining acid pretreatment and steam method. Background technique [0002] Lightweight materials such as magnesium and magnesium alloys have attracted extensive attention and research in aerospace, automotive, and biomedical fields due to their outstanding properties, such as high specific strength, specific stiffness, and excellent machinability. However, its active chemical properties and poor corrosion resistance hinder its practical application and development. One of the effective ways to solve this problem is to prepare high-performance coatings by surface modification techniques, such as chemical conversion coatings, micro-arc oxidation (MAO) coatings, and layer-by-layer self-assembled coatings. However, a large amount of chemicals are usually used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00C23G1/12
CPCC23C26/00C23G1/12
Inventor 张芬孙翔曾荣昌王金梦
Owner SHANDONG UNIV OF SCI & TECH
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