表面纳米化对锆合金微动腐蚀行为的影响  

Effect of Surface Nanocrystallization on Fretting Corrosion Behavior of Zirconium Alloy

作　　者：唐晨[1] 张伟[1] 李正阳[2] 蔡振兵[2] TANG Chen;ZHANG Wei;LI Zheng-yang;CAI Zhen-bing(Nuclear Power Institute of China,Chengdu 610213,China;Tribology Research Institute,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国核动力研究设计院,成都610213 [2]西南交通大学摩擦学研究所,成都610031

出　　处：《装备环境工程》2022年第11期110-118,共9页Equipment Environmental Engineering

基　　金：国家自然科学基金重点项目(U2067221)。

摘　　要：目的研究N36锆合金表面纳米化层的形貌和微观结构,分析表面纳米化层的微动腐蚀机理。方法采用超声表面滚压技术(USRP)对锆合金进行表面纳米化处理,研究不同滚压速度对表面纳米化层形貌、相组成、粗糙度、显微硬度、电化学腐蚀和微动腐蚀行为的影响。结果USRP处理后,锆合金表面有明显的塑性变形痕迹,致使锆合金表面发生加工硬化,提高了表面的硬度。锆合金的腐蚀电流密度相较于基体更低,最大磨损深度和磨损率均低于基体。结论USRP处理后的锆合金晶粒细化、晶界增多,提高了锆合金的表面活性,有利于钝化膜的形成。锆合金的磨损机理为氧化磨损和磨粒磨损的共同作用。The morphology and microstructureof N36 zirconium(Zr)alloy surface nanocrystallization layer were studied.The frettingcorrosion mechanism of the surface nanocrystallization layer was analyzed.Ultrasonic surface rolling processing(USRP)was used to preparesurface nanocrystallization layer on Zr alloys.The effects of rolling speeds on the morphology,phase composition,roughness,hardness,electrochemical corrosion and fretting corrosion behavior of the surface nanocrystallization layer were studied.Results shows thatZralloyafter USRP present plastic deformation trace.The plastic deformation on the sur-face of Zr alloy leads to work hardening and increases the surface hardness.The electrochemical corrosion tests indicate that Zr alloy after USRP shows a lower corrosion current density compared with substrate.The wear depth and wear rate of Zr alloy af-ter USRP is lower than thatsubstrate.The Zr alloy after USRP refinegrain and increase the number of grain boundary,which im-proving the activity of Zr alloy and beneficial to form passivation film.The wear mechanism of Zr alloy after USRP is the inter-action of oxidation wear and abrasive wear.

关 键 词：锆合金 超声表面滚压 表面纳米化 腐蚀 微动腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]