The Preparation, Characterization and Formation Mechanism of a Calcium Phosphate Conversion Coating on Magnesium Alloy AZ91D.
The Preparation, Characterization and Formation Mechanism of a Calcium Phosphate Conversion Coating on Magnesium Alloy AZ91D.
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DOI：
10.3390/ma11060908
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发表时间：
2018-05-28
期刊：
影响因子：
--
通讯作者：
Ding Y
中科院分区：
文献类型：
--
作者：
Liu D;Li Y;Zhou Y;Ding Y
镁合金的耐蚀性差是阻碍其广泛应用的主要障碍之一。化学转化膜由于具有成本低、操作简单等优点，在提高镁合金耐蚀性方面受到了广泛的关注。本研究采用化学转化的方法在AZ91D镁合金表面制备了一层钙磷涂层。采用扫描电子显微镜(SEM)和电化学方法研究了工艺参数对磷化钙涂层组织结构和耐蚀性的影响，并用X射线衍射仪(XRD)对涂层成分进行了表征。磷酸钙涂层主要由CaHPO4·2H2O(DCPD)组成，裂纹和气孔较少。在常温、20min、不搅拌的条件下，获得的涂层具有良好的耐蚀性能，涂层组织呈树叶状。同时，认识到NH4H2PO4在转化过程中作为成膜剂和酸化剂的作用，并对DCPD的形成机理进行了详细的探讨。
The poor corrosion resistance of magnesium alloys is one of the main obstacles preventing their widespread usage. Due to the advantages of lower cost and simplicity in operation, chemical conversion coating has drawn considerable attention for its improvement of the corrosion resistance of magnesium alloys. In this study, a calcium phosphate coating was prepared on magnesium alloy AZ91D by chemical conversion. For the calcium phosphate coating, the effect of processing parameters on the microstructure and corrosion resistance was studied by scanning electron microscope (SEM) and electrochemical methods, and the coating composition was characterized by X-ray diffraction (XRD). The calcium phosphate coating was mainly composed of CaHPO4·2H2O (DCPD), with fewer cracks and pores. The coating with the leaf-like microstructure provided great corrosion resistance to the AZ91D substrate, and was obtained under the following conditions: 20 min, ambient temperature, and no stirring. At the same time, the role of NH4H2PO4 as the coating-forming agent and the acidifying agent in the conversion process was realized, and the formation mechanism of DCPD was discussed in detail in this work.
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