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首页> 外文期刊>International Journal of Electrochemical Science >Preparation and Phosphating of Yttrium-Based Chemical Conversion Coatings on AZ91D Magnesium Alloy for Corrosion Protection
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Preparation and Phosphating of Yttrium-Based Chemical Conversion Coatings on AZ91D Magnesium Alloy for Corrosion Protection

机译：AZ91D镁合金上的钇基化学转化膜的制备与磷酸化

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The yttrium-based chemical conversion coatings were prepared on AZ91D magnesium alloy byimmersing in yttrium nitrate solution firstly, and then in ammonium dihydrogen phosphate(NH4H2PO4) solution. The micro-morphology and the composition of the coating were investigatedusing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The results show that the numberand size of the cracks in the coating were obviously reduced after phosphating, and the compactness ofthe yttrium conversion coatings were increased. The phosphated coating was mainly composed ofY2O3, YOx/y, Mg3(PO4)2, AlPO4 and YPO4. Furthermore, the corrosion resistance of the coating wasmeasured by means of potentiodynamic polarization curves and electrochemical impedancespectroscopy (EIS). Following phosphating, the corrosion potential of the coating was shiftedpositively about 180mV compared to the uncoated one, and the corrosion current density decreasedabout one order of magnitude.
机译：首先在AZ91D镁合金上先浸入硝酸钇溶液，然后再浸入磷酸二氢铵（NH4H2PO4）溶液中制备钇基化学转化膜。分别使用扫描电子显微镜（SEM），能量色散光谱（EDS），X射线衍射（XRD）和X射线光电子能谱（XPS）研究了涂层的微观形貌和组成。结果表明，磷化后涂层中裂纹的数量和大小均明显减少，钇转化膜的致密性增加。磷酸盐涂层主要由Y2O3，YOx / y，Mg3（PO4）2，AlPO4和YPO4组成。此外，通过电位动力学极化曲线和电化学阻抗谱法（EIS）测量了涂层的耐腐蚀性。磷化后，与未涂层相比，涂层的腐蚀电位正向偏移约180mV，腐蚀电流密度降低约一个数量级。

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