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首页> 外文期刊>Corrosion >Effects of Sodium Fluoride on Structure and Corrosion Resistance of Plasma Electrolytic Oxidation Ceramic Coatings on Magnesium Alloys
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Effects of Sodium Fluoride on Structure and Corrosion Resistance of Plasma Electrolytic Oxidation Ceramic Coatings on Magnesium Alloys

机译：氟化钠对镁合金上等离子电解氧化陶瓷涂层结构和耐蚀性的影响

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摘要

F- is used widely as an additive in the electrolyte solutions during the plasma electrolytic oxidation (PEO) of Mg alloys. The goal of this work was to investigate effects of sodium fluoride (NaF) on the structure and corrosion resistance of the ceramic coatings containing Ca and P on AZ91D (UNS M11916) Mg alloy using the PEO technique. The phase composition, morphology, and the element distribution of the coatings were studied using x-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. The corrosion resistance of the coatings in the simulated body fluid (SBF) was examined using electrochemical impedance spectroscopy (EIS) and the polarizing curve methods. The results show that the coating was composed mainly of magnesium oxide (MgO), which was increased with a dosage of NaF. Ca and P also existed in the coating. The coating had a two-layer structure: the outer layer was loose and porous and the inner layer was comparatively dense. There were many microholes on the coating surface. Increasing the dosage of NaF, the thickness and roughness of the coating were increased. The amount of Mg increased gradually from the outer layer to the inner layer, the amount of O changed less, and the amount of F and Ca in the outer layer was more than that in the inner layer. EIS and the polarizing curve tests showed the coatings improved the corrosion resistance of the AZ91D Mg alloy in SBF solution by nearly two orders of magnitude; the coating prepared without NaF had the best corrosion resistance; the doping of NaF was not liable to improve the corrosion resistance of the coating. [PUBLICATION ABSTRACT]
机译：在镁合金的等离子体电解氧化（PEO）过程中，F-被广泛用作电解质溶液中的添加剂。这项工作的目的是利用PEO技术研究氟化钠（NaF）对AZ91D（UNS M11916）Mg合金上含Ca和P的陶瓷涂层的结构和耐蚀性的影响。使用X射线衍射，扫描电子显微镜和能量色散光谱研究了涂层的相组成，形态和元素分布。使用电化学阻抗谱（EIS）和极化曲线方法检查了涂层在模拟体液（SBF）中的耐腐蚀性。结果表明，该涂层主要由氧化镁（MgO）组成，并随NaF剂量的增加而增加。 Ca和P也存在于涂层中。涂层具有两层结构：外层是疏松多孔的，内层是相对致密的。涂层表面有许多微孔。增加NaF的剂量，增加了涂层的厚度和粗糙度。 Mg的含量从外层到内层逐渐增加，O的含量变化较小，并且外层中的F和Ca的含量大于内层中的。 EIS和极化曲线测试表明，该涂层将AZ91D Mg合金在SBF溶液中的耐蚀性提高了近两个数量级。没有NaF制备的涂层具有最佳的耐腐蚀性； NaF的掺杂不易于提高涂层的耐腐蚀性。 [出版物摘要]

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  • 来源
    《Corrosion》 |2010年第8期|p.1-6|共6页
  • 作者

    Z P Yao X R Liu L L Li S F Qi Z H Jiang;

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    Z.P. Yao,[dagger],* X.R. Liu,** LL. Li, ** S.F. Qi, ** and Z.H. Jiang**Submitted for publication December 30, 2009: in revised form, April 3, 2010.[double dagger] Corresponding author. E-mail address: yaozhongping@hit.edu.cn.* School of Chemical Engineering and Technology. Postdoctoral Station of Chemistry Engineering and Technology, Harbin Institute of Technology. Harbin 150001, People's Republic of China.** School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001. People's Republic of China.;

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