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Preparation method for corrosion-resistant organic composite coating on surface of magnesium alloy

A composite coating and magnesium alloy technology, which is applied to the device for coating liquid on the surface, coating, pretreatment surface, etc., can solve the problems of poor bonding force of the magnesium alloy matrix and unsatisfactory anti-corrosion effect, etc. Achieve the effects of low corrosion current density, smooth, uniform and compact surface, and high electrochemical impedance

Active Publication Date: 2018-03-30
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thickness of the film layer is generally thin, the bonding force with the magnesium alloy substrate is not good, and its anti-corrosion effect is not satisfactory.

Method used

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  • Preparation method for corrosion-resistant organic composite coating on surface of magnesium alloy
  • Preparation method for corrosion-resistant organic composite coating on surface of magnesium alloy
  • Preparation method for corrosion-resistant organic composite coating on surface of magnesium alloy

Examples

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Embodiment

[0017] (1) The AZ91 magnesium alloy is polished and polished step by step with 280#, 600#, 800# and 1200# water-resistant abrasive paper, washed with water, and then degreased in an alkaline degreasing solution at 60 ° C for 1 minute, and then heated separately Wash with water and cold water, then ultrasonically clean in absolute ethanol for 10 minutes, then ultrasonically clean in deionized water for 10 minutes, and finally dry at 80°C for later use; the formula of the alkaline degreasing liquid is: sodium phosphate 20g / L, Sodium hydroxide 20g / L, sodium carbonate 40g / L.

[0018] (2) Put the AZ91 magnesium alloy treated in step (1) into the micro-arc oxidation electrolyte as the anode for micro-arc oxidation treatment, the cathode is stainless steel, and the pulse micro-arc oxidation method is used. The processing parameters are set as follows: the termination voltage is 220 volts, the oxidation time is 30 minutes, the pulse frequency is 50 Hz, and the duty ratio is 30%, so th...

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Abstract

The invention discloses a preparation method for a corrosion-resistant organic composite coating on the surface of magnesium alloy. The preparation method comprises the following steps: first, performing pre-treatment, such as grinding, polishing, water washing, oil removing and ultrasonic washing, on a magnesium alloy substrate in sequence; then, preparing micro-arc oxidizing electrolyte, and performing micro-arc oxidizing on the magnesium alloy which is subjected to the pre-treatment to form a micro-arc oxidation film; next, mixing epoxy resin and polyamide in proportion, dip-coating the surface of the micro-arc oxidation film with a mixture, and standing and drying at room temperature; and finally, dipping the micro-arc oxidation film in a polyacrylamide aqueous solution, taking out themicro-arc oxidation film, and frying for 1 to 12 hours at 80 to 150 DEG C to prepare the corrosion-resistant organic composite coating on the surface of the magnesium alloy. The method disclosed by the invention is easy to operate; the prepared organic composite coating on the surface of magnesium alloy can be bonded firmly with a substrate, has a smooth, uniform and dense surface, completely cover micro-pores of the micro-arc oxidation film, has high electrochemical impedance, low corrosion current density and hydrophobic property, and can improve the corrosion resistance of the magnesium alloy well.

Description

technical field [0001] The invention belongs to the field of metal material surface corrosion and protection, in particular to a method for preparing a corrosion-resistant organic composite coating on the surface of a magnesium alloy. Background technique [0002] Magnesium is rich in reserves and excellent in performance, but as a metal material, there are still many problems in direct production and application. The two reasons that limit the large-scale use of magnesium alloys are poor corrosion resistance and wear resistance. The standard electrode potential of pure magnesium is relatively negative, only -2.37 V. Magnesium and its alloys are easily corroded in humid environments, especially in corrosive media containing chloride ions, bromide ions, sulfate ions, etc., which makes magnesium Alloys have very high requirements on the application environment. In addition, magnesium alloys are relatively soft, have low hardness, and poor wear resistance. These defects severe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/10B05D7/14C25D11/30
CPCB05D3/102B05D7/14B05D2202/20B05D2504/00B05D2505/00B05D2518/00C25D11/30B05D2420/01B05D2420/02
Inventor 尚伟展晓强温玉清冯宇炜李雨晴
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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