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Preparing method for graphene oxide composite coating on surface of magnesium alloy

A technology of graphene compounding and surface oxidation, applied in the direction of coating, electrolytic coating, etc., to achieve the effect of simple operation, low corrosion current density, and uniform surface

Active Publication Date: 2016-02-24
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene oxide films are mostly used for some common metals and alloys such as copper and steel, and less used for magnesium alloys.

Method used

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  • Preparing method for graphene oxide composite coating on surface of magnesium alloy

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Embodiment

[0015] (1) Pretreatment of magnesium alloy

[0016] The AZ91 magnesium alloy was successively ground, polished, and washed with 600# and 1200# water-resistant abrasive paper, and then degreased in alkaline degreasing solution at 60°C for 1 minute, and then cleaned the surface of the sample with hot water and cold water respectively. Then ultrasonic cleaning in absolute ethanol for 10 minutes, ultrasonic cleaning with deionized water for 3 times, and cold air drying for subsequent use; the formula of the alkaline degreasing liquid is: sodium phosphate 20g / L, sodium hydroxide 20g / L, sodium carbonate 30g / L.

[0017] (2) Preparation of graphene oxide

[0018] Graphite oxide is prepared by the improved Hummers method. First cool 120ml of concentrated sulfuric acid in an ice-water bath. Under stirring, slowly add 5g of graphite powder in batches. After the reactants are completely mixed, the system is black; then slowly add 15g of high manganese in batches. Potassium acid, the so...

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Abstract

The invention discloses a preparing method for a graphene oxide composite coating on the surface of a magnesium alloy. The preparing method includes the steps that firstly, a magnesium alloy matrix is preprocessed; then, graphene oxide is prepared and dissolved into a 1-5 ml / L triethanolamine water solution and is subjected to ultrasonic dispersing for 2 hours to serve as an electroplating electrolyte; afterwards, a CHI860D type electrochemical workstation is used for assembling a three-electrode system, the preprocessed magnesium alloy serves as a study electrode, a platinum electrode serves as an auxiliary electrode, a saturated calomel electrode serves as a reference electrode, and the chronoamperometry is selected for conducting electrochemical deposition on the magnesium alloy; and finally, the magnesium alloy is taken out to be dried for 1-2 hours at the temperature ranging from 60 DEG C to 70 DEG C, and the graphene oxide composite coating on the surface of the magnesium alloy is obtained. The method is easy to operate, the surface of the obtained composite coating is even and flat, a typical crumple structure of the graphene oxide exists, low corrosion current density and high electrochemical resistance are achieved, and corrosion resistance of the magnesium alloy can be well improved.

Description

technical field [0001] The invention belongs to the field of electrochemical corrosion and protection on the surface of metal materials, and in particular relates to a preparation method of a graphene oxide composite coating on the surface of a magnesium alloy. Background technique [0002] As a very important light metal structural material, magnesium alloy is known as "green engineering metal structural material in the 21st century". Magnesium alloys have many special properties that cannot be replaced by other materials, such as light weight, good castability and dimensional stability, strong regeneration, etc. These properties make magnesium alloys widely used in metallurgy, aviation, military, electronics, Automotive industry, electrode materials and other fields. However, the most critical reason that restricts the development of the practical application of magnesium alloys is that magnesium alloys have relatively negative electrode potentials and are easily corroded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/12C25D5/18
CPCC25D5/18C25D9/12
Inventor 尚伟何楚斌温玉清王媛媛吴文凯
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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