摘要
目前锆合金表面处理存在周期长、装置复杂,得到的膜层质量不理想的问题,为此,开发了以焦磷酸钠为主要成分的电解液,研究了锆合金Zircaloy-4的直流微弧氧化(MAO)行为。采用扫描电镜和XRD对膜层的微观结构和相组成进行了分析。结果表明:微弧氧化膜层的生长符合线性规律,生长速度可达2.1μm/min;膜层的主要相组成为单斜氧化锆(m-ZrO2);经微弧氧化处理的膜层能够大幅度提高Zircaloy-4合金基体的自腐蚀电位,降低其自腐蚀电流密度。
A kind of electrolyte containing sodium pyrophosphate as the main component was formulated.The micro-arc oxidation behavior of zirconium alloy(Zircaloy-4) in the electrolyte was investigated.The microstructure and phase composition of resultant coating were studied by means of scanning electron microscopy and X-ray diffraction.It was found that the growth of the coating obeyed the linear law,and the growth rate was as much as 2.1 μm/min.The coating mainly consisted of monoclinic zirconium oxide(m-ZrO2),and was able to significantly increase the free corrosion potential and reduce the corrosion current density of Zircaloy-4 substrate.
出处
《材料保护》
CAS
CSCD
北大核心
2011年第5期8-10,82,共3页
Materials Protection
基金
湖南大学"中央高校基本科研业务费"资助
国家自然科学基金项目(51071066)资助
