利用消失模铸造工艺,以PbO-ZnO系低温玻璃粉作为主要的陶瓷化材料,进行了镁合金表面陶瓷化研究.利用SEM、XRD、线能谱分析和极化曲线等手段研究了镁合金表面陶瓷涂层的组织结构、相组成和元素的分布,测试了陶瓷层的耐腐蚀性能.结果表明,在基体的表面形成厚度为40～80μm左右的陶瓷涂层,涂层的主要成分有低温玻璃粉组成,并且成分组成由表层到基体变化明显,与基体之间形成了良好的结合界面.通过电化学性能测试表明,表面陶瓷层的腐蚀电位大幅度的提高,腐蚀电流密度降低,经过表面陶瓷化的镁合金耐腐蚀性能得到了提高.
Investigation of magnesium alloy surface ceramic-coating was conduct through evaporative pattern casting technology,the PbO-ZnO system low temperature glass was used to be the mainly ceramic material in the research.The corrosion resistance of ceramic-coating was tested by polarization curve,SEM and lineal energy spectrum were used to observed the change of surface microstructure and element distribution.The phase constitution was analyzed in coating by XRD.The analysis indicates that the coating with a thickness of 40-80μm was formed on the substrate surface and its mainly ingredient was low-temperature glass,the ingredient has a obvious change from the surface to the substrate,the interface quality between the ceramic-coating and substrate is in a good bond condition.The corrosion resistance of magnesium alloy coated with glass powder is improved considerably as verified by electrochemical testing,the corrosion potential increased greatly and corrosion current density decreased obviously after surface ceramic treatment.The ceramic-coating formed can provide a good corrosion resistance of magnesium alloy.
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