铈对Zr-4合金微弧氧化陶瓷膜结构和性能的影响

Effect of Cerium on the Structure and Properties of Micro-Arc Oxidation Ceramic Coatings of Zircalloy-4

摘要:

在硅酸盐碱性电解液中加入稀土元素Ce的络合物，采用恒压微弧氧化技术在Zr-4合金表面制备陶瓷膜。分析了稀土元素Ce在陶瓷膜中的存在形式，以及对陶瓷膜的厚度、相组成、耐磨损性能和耐腐蚀性能的影响。稀土元素Ce能够进入陶瓷膜并在陶瓷膜中以固溶形式存在，影响陶瓷膜中t-ZrO2和m-ZrO2的相对比例，使孔洞及粒状物明显减少，陶瓷膜表面光滑致密，陶瓷膜厚度增加，耐磨、耐腐蚀性能提高。电解液中Ce的络合物加入量在0.001~0.003 mol/L时效果最为明显

Abstract:

Adding cerium complex to the silicate alkalinity electrolyte, the ceramic coating on the surface of Zircalloy-4 was prepared by constant voltage micro-arc oxidation. The existing form of the rare-earth element Ce in the ceramic coating and the influence of Ce on the coating thickness, phase composition, wear resistance and corrosion resistance were analyzed. The results show that Ce can enter the ceramic coating and exists in the form of solid solution, so that the relative proportion of t-ZrO2 and m-ZrO2 phases changes, the pores and granules are obviously reduced, the surface becomes smoother and more compact, the thickness of the coating increases, and the corrosion resistance and wear resistance are remarkably improved. The optimal addition amount of cerium complex in the electrolyte is 0.001-0.003 mol/L