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Study on the One-step-coloring of Magnesium Alloy by Micro-arc Oxidation and Its Electrolyte Lifetime

Author: TaiHongBo
Tutor: WangJinXian；DongXiangTing
School: Changchun University of Science and Technology
Course: Inorganic Chemistry
Keywords: Magnesium Alloy Micro-arc Oxidation Lifetime of Electrolyte One-step-coloring
CLC: TG174.41
Type: Master's thesis
Year: 2009
Downloads: 250
Quote: 4
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Abstract


Micro-arc oxidation （MAO） is an advanced surface protective technology for preparation of ceramic coatings on the metals, Which is payed extensively more attention in the area of magnesium alloy surface treatment technology. In this dissertation, the effect factor of micro-arc oxidation electrolyte of magnesium alloy was studied. The method of prolonging the lifetime of the electrolyte is obtained. The micro-oxidation and one-step-coloring technology are systematically studied.The effects of the concentrations of NaOH, main salt and additives on the lifetime of the electrolyte are discussed. With the increase of the concentration of NaOH, the lifetime of electrolyte decreased. The lifetime of electrolyte of silicon system is shortest, that of phosphorus system next and that of aluminum system is the longest. The lifetime of electrolyte can be prolonged by adding the （NaPO3）6 in the disabled electrolyte because （NaPO3）6 can increase the corrosion resistance of coat. The depth of ceramic coating color can be controlled by the content of colored salt, or main salt, or the final voltage of micro-oxidation. With the the content of the coloring salts, the color of the ceramic coating deepen, and the same to the main salt content and the final voltage. The black or gray purple ceramic coat with smooth surface were obtained by the study on the complexation reaction of colored salt （CuSO4·5H2O） with ammonia and EDTA respectively and then micro-arc oxidation coloring experiment in the electrolyte composed of the above complexo and sodium silicate, KOH and KF.The XRD analysis shows that the main components of the black and purple gray ceramic coat are MgO and Mg2SiO4. Energy spectrum proves that copper ion had entered the film. The thickness, hardness, adhesion force and color lasting tests of the black and purple gray ceramic coat made by micro-arc oxidation show that the ceramic coat has good adhesion to the substrate, adjustable coat thickness, compact and smooth appearance, and lasting color, higher hardness and corrosion resistance than original magnesium alloy.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Electrochemical protection
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