In this paper, a micro-arc oxidation (MAO) coating was formed on NiTi alloy in a 0.2 mol/L NaAlO2base electrolyte with three additives of 0.03 mol/L NaOH, 0.03 mol/L NaH2PO2 and 0.03 mol/LNa3PO4, respectively. The influence of different additives on the surface morphology and corrosionresistance of the MAO coatings was systematically investigated. The result revealed that a relativelyflat MAO ceramic coating with a typical MAO porous morphology was presented in the electrolytewith NaH2PO2. The coating showed the best corrosion resistance which was verified by the smallestcorrosion current density after polarization test, indicating that NaH2PO2 was an ideal additive. On thebase of the above results, MAO-NaH2PO2 coating was mainly studied. The section morphologyindicated that the MAO-NaH2PO2 coating was composed of the dense inner layer and loose outer layer,with a thickness of 5.4 μm. XRD showed that the MAO-NaH2PO2 coating was mainly composed ofAl2O3. It was also proved that the wear resistance of the MAO-NaH2PO2 coating had been improved.
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机译：在本文中，在0.2mol / L Naalo2Base电解质中形成微电弧氧化（MAO）涂层，其中三种添加剂分别为0.03mol / L NaOH，0.03mol / L NaH2PO2和0.03mol / Lna3PO4。系统研究了不同添加剂对毛涂层表面形态和腐蚀的影响。结果表明，在电解质技术NaH2PO 2中介绍了具有典型MAO多孔形态的相对型MAO陶瓷涂层。涂层显示出最佳耐腐蚀性，通过偏振试验后的小核腐蚀电流密度验证，表明NaH2PO2是理想的添加剂。在上述结果的基础上，主要研究了Mao-NaH2PO2涂层。 MAO-NaH2PO2涂层的形态晶部分由致密内层和松散的外层组成，厚度为5.4μm。 XRD表明，MAO-NaH2PO2涂层主要由2O3组成。还证明了MAA-NaH2PO2涂层的耐磨性已得到改善。
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