TaSiCN、TaAlSiCN和TaCrSiCN涂层在NaCl-KCl熔盐中的耐腐蚀性能对比研究  

Comparative Study on Corrosion Resistance of TaSiCN,TaAlSiCN and TaCrSiCN Coatings in NaCl-KCl Molten Salt

作　　者：宁知恩 吴璐[1] 张伟[1] 方忠强[1] 毛建军 孔祥刚 Ning Zhien;Wu Lu;Zhang Wei;Fang Zhongqiang;Mao Jianjun;Kong Xianggang(Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2023年第S02期193-200,共8页Nuclear Power Engineering

基　　金：国家自然科学基金(U2067218);国家重点研发计划(2022YFB1902403)。

摘　　要：为探究Al、Cr元素掺杂的TaSiCN涂层在NaCl-KCl熔盐中的耐腐蚀性能,利用射频磁控溅射技术并通过调控Ar和N_(2)混合气体的比例在Ta合金基体上制备了近似N原子百分比的TaSiCN、TaAlSiCN和TaCrSiCN纳米复合涂层。系统研究了涂层的微观结构、化学组成和耐NaCl-KCl熔盐的腐蚀性能。结果表明:所有沉积态的涂层均由TaN、TaC和Ta(C,N)纳米晶相以及SiCx、SiN_(x)、CN_(x)和sp2无定型态碳等非晶相组成,其中掺杂元素Al、Cr也以非晶的形式存在于涂层之中。腐蚀后的涂层表面主要由Ta(C,N)、Ta_(2)O_(5)、Na_(2)Ta_(4)O_(11)晶相成分和一些非晶相成分构成。涂层在NaCl-KCl熔盐中的腐蚀行为主要以氧化腐蚀为主,熔盐侵蚀为辅。通过对比发现,涂层耐腐蚀性顺序为:TaAlSiCN>TaSiCN>TaCrSiCN。本研究可为熔盐电解坩埚表面涂层技术的开发提供一种具有应用潜力的候选涂层材料。In order to explore the corrosion resistance of Al and Cr doped TaSiCN coatings in NaCl-KCl molten salt,nano-composite coatings of TaSiCN,TaAlSiCN and TaCrSiCN with approximately N atomic percent were prepared on Ta alloy substrate by using RF magnetron sputtering technology and adjusting the ratio of Ar and N_(2)mixed gases.The microstructure,chemical composition and corrosion resistance of the coating in NaCl-KCl molten salt were systematically studied.The results show that all as-deposited coatings are composed of TaN,TaC and Ta(C,N)nanocrystals and amorphous carbon such as SiCx,SiN_(x),CN_(x)and sp2,among which the doped Al and Cr elements also exist in the coatings in amorphous form.After corrosion,the coating surface is mainly composed of crystalline components such as Ta(C,N),Ta_(2)O_(5)and Na_(2)Ta_(4)O_(11),and other amorphous components.The corrosion behavior of coating in NaCl-KCl molten salt is mainly oxidation corrosion,supplemented by molten salt corrosion.Through comparison,it is found that the order of corrosion resistance of three coatings is:TaAlSiCN>TaSiCN>TaCrSiCN.This study can provide a potential candidate coating material for the development of surface coating technology of molten salt electrolytic crucible.

关 键 词：TaSiCN涂层 磁控溅射技术 Ta合金 NaCl-KCl熔盐 抗腐蚀性 

分 类 号：TL941.33[核科学技术—辐射防护及环境保护]