Plasma electrolytic oxidation of zircaloy-4 alloy with DC regime and properties of coatings

作     者：程英亮 伍帆 CHENG Ying-liang;WU Fan

作者机构：湖南大学材料科学与工程学院长沙410082 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2012年第22卷第7期

页      面：1638-1646页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project (51071066) supported by by the National Natural Science Foundation of China Project (531107040029) supported by the Fundamental Research Fund for the Central Universities,China Project supported by the Development of Youth Teachers of Hunan University,China 

主　　题：zirconium alloy plasma electrolytic oxidation corrosion resistance micro-hardness 

摘      要：The plasma electrolytic oxidation（PEO） coatings on zircaloy？4 alloy were prepared in silicate,phosphate and pyrophosphate electrolyte systems or their combination by DC current *** proper processing parameters were determined and the coatings were evaluated by electrochemistry technique,micro-hardness,SEM and *** results show that the coating prepared in pure silicate system is uneven and after the addition of phosphate solution,the homogeneity of the coating is still *** coating prepared in pure pyrophosphate electrolyte system is homogeneous,but its hardness value is *** the addition of silicate into the pyrophosphate electrolytic system,both the uniformity and hardness of the coating are *** XRD results show that the phase compositions are m-ZrO2 and t-ZrO2,the addition of silicate is beneficial to the formation of *** results of polarization curves show that the coatings prepared in pyrophosphate and the mixture of pyrophosphate and silicate have better corrosion resistance.