Abstract
Plasma electrolytic oxidation (PEO) technique is one of the important methods used in the surface modification of magnesium alloys. In this paper, the ceramic coatings on pretreated KBM10 magnesium alloy with Nd(NO3)3 solution were prepared by PEO. The effects of Nd(NO3)3 solution concentration on the microstructure and corrosion resistance of PEO coatings on magnesium alloys were investigated by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD), and electrochemical workstation. It was found that the surface of the coatings was porous after PEO, and element Nd could be deposited on the surface of the coatings by pretreatment and existed in the PEO coatings. The coating formed at Nd(NO3)3 solution concentration of 0.06 mol/L exhibited the best corrosion resistance among all the as-prepared coatings.
Highlights
Magnesium alloys have great application value in the field of materials
The application range of magnesium alloys has been continuously expanding, but the high chemical activity and mechanical strength of magnesium have constrained the development of magnesium alloys [6,7]
The results showed that the prefabricated Plasma electrolytic oxidation (PEO) coating with ultrasonic shot peening rare earth was smoother, and the corrosion resistance of the coating was greatly improved [26]
Summary
Magnesium alloys have great application value in the field of materials. Because of urgent energy and environmental problems [1], and the obvious advantages [2] of magnesium alloys, magnesium alloys have been applied in many fields: the automobile industry, the 3C industry, the aerospace industry, metallurgy, the chemical industry, modern weapons, the nuclear industry, and so on [3,4,5].The application range of magnesium alloys has been continuously expanding, but the high chemical activity and mechanical strength of magnesium have constrained the development of magnesium alloys [6,7]. Magnesium alloys have great application value in the field of materials. Because of urgent energy and environmental problems [1], and the obvious advantages [2] of magnesium alloys, magnesium alloys have been applied in many fields: the automobile industry, the 3C industry, the aerospace industry, metallurgy, the chemical industry, modern weapons, the nuclear industry, and so on [3,4,5]. The standard equilibrium potential of Mg/Mg2+ is −2.34 V [8], so it is highly susceptible to chemical and electrochemical corrosion. The corrosion potential of magnesium alloy in aqueous solution is negative, about −1.5 V, which is more prone to corrosion than other metallic materials. The corrosion equations of magnesium alloys in water and air are as follows: Mg + 2H2 O → Mg(OH)2 + H2 ↑
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