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首页> 外文期刊>International Journal of Electrochemical Science >The Study of a Phosphate Conversion Coating on Magnesium Alloy AZ91D: I. Formation, Morphology and Composition
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The Study of a Phosphate Conversion Coating on Magnesium Alloy AZ91D: I. Formation, Morphology and Composition

机译：镁合金AZ91D上的磷酸盐转化膜的研究：I。形成，形貌和组成

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This paper involved a phosphate conversion coating on magnesium alloy AZ91D. The formation of thephosphate conversion coating was studied with potential-time curve and electrochemical impedancespectroscopy (EIS), and the morphology and composition of the phosphate conversion coating wereanalyzed with scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectronspectroscopy (XPS). The results showed that the growth process of the phosphate conversion coatingcould be divided into three steps. In the first step (0-40 s) the potential fluctuated sharply due to thealternate presence and absence of the metastable crystal nucleuses and the formation of the stablecrystal nucleuses composed of the elements of Zn, P and O. In the second step (40-200 s) the potentialmoved to the negative direction because of the electrochemical inhomogeneity attributed to the growthof the stable crystal nucleuses until the magnesium alloy surface was covered by the slab-likephosphate crystals completely. In the finally step (200-1200 s) the potential move to the positivedirection slowly until it leveled off because the thickness of the phosphate conversion coatingincreased gradually from the slab-like phosphate crystals initially. The magnesium alloy substrate wasisolated from the acidic and corrosive phosphating bath by the phosphate conversion coating, whichwas formed completely at 1200s. The phosphate conversion coating showed a uniform, compact andintegral crystal clusters and was composed of Zn3(PO4)2, Zn2Mg(PO4)2 and Zn.
机译：本文涉及镁合金AZ91D上的磷酸盐转化膜。用电位时间曲线和电化学阻抗谱（EIS）研究了磷酸盐转化膜的形成，并用扫描电子显微镜（SEM），X射线衍射（XRD）和X射线分析了磷酸盐转化膜的形貌和组成。光电子能谱（XPS）。结果表明，磷酸盐转化膜的生长过程可以分为三个步骤。在第一步（0-40 s）中，由于交替存在和不存在亚稳态晶核以及形成由Zn，P和O元素组成的稳定晶核，电势急剧波动。在第二步（40- 200 s）的电位因电化学不均匀性而向负方向移动，这归因于稳定晶核的生长，直到镁合金表面完全被板状磷酸盐晶体覆盖为止。在最后一步（200-1200 s）中，电势缓慢地向正方向移动，直到其趋于平稳为止，这是因为磷酸盐转化膜的厚度最初是从板状磷酸盐晶体逐渐增加的。通过磷酸盐转化膜将镁合金基材从酸性和腐蚀性的磷化浴中分离出来，该涂层在1200s内完全形成。磷酸盐转化膜显示出均匀，致密且完整的晶体簇，由Zn3（PO4）2，Zn2Mg（PO4）2和Zn组成。

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