Optimization of Cr/Mo molar ratio in FeCoCrMoCBY alloys for high corrosion resistance  

高耐腐蚀性能FeCoCrMoCBY合金中的最优Cr/Mo摩尔比（英文）

作　　者：Cheng-jie WANG Qing-jun CHEN Huai-xiao XIA 王诚杰;陈庆军;夏怀效(南昌航空大学材料科学与工程学院,南昌330063)

机构地区：[1]School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第12期2663-2672,共10页中国有色金属学报（英文版）

基　　金：Project(51261021)supported by the National Natural Science Foundation of China;Project(KJLD13056)supported by the Science and Technology Landing Plan of Jiangxi Province,China

摘　　要：The corrosion behavior of bulk metallic glasses(BMGs)(Fe41Co7Cr15Mo14C15B6Y2)100-xCrx(x=0,4,8,12,molar fraction,%)was investigated in1mol/L HCl aqueous solution with electrochemical tests.The electrochemical measurements demonstrate that the passive current density of Fe-based amorphous alloy is reduced by about one order of magnitude,and meanwhile,the stability of passive film can be guaranteed by the Cr/Mo molar ratio.The Mott–Schottky(M–S)curves show that the passive film is the densest when the molar ratio of Cr/Mo is between1.37and1.69.X-ray photoelectron spectroscopy(XPS)analysis was performed to clarify chemical states of elements in the passive films.The results show that the corrosion resistance of the alloy is related to the molar ratio of Cr/Mo.The stability of passive film is determined by the synergistic action of Cr and Mo elements.The main component of the passive film is Cr3+oxide.When the potential is greater than0.5V(vs SCE),Mo6+ions play an important role in keeping the stability of the passive film.The appropriate molar ratio of Cr/Mo can reduce the dissolution rate of the passive film.采用水冷铜模吸铸法制备(Fe_(41)Co_7Cr_(15)Mo_(14)C_(15)B_6Y_2)_(100-x)Cr_x(x=0,4,8,12,摩尔分数,%)块体金属玻璃,利用电化学方法研究其在1 mol/L HCl中的耐腐蚀性能。电化学测试发现钝化电流密度降低了大约一个数量级,同时发现适当的Cr/Mo摩尔比可以保证钝化膜的稳定性。Mott–Schottky曲线证实当Cr/Mo摩尔比为1.37~1.69时,合金的钝化膜更致密。采用XPS分析钝化膜中元素的化学状态,发现合金耐腐蚀性能与Cr/Mo摩尔比有关,钝化膜的稳定性由Cr和Mo协同作用决定。钝化膜的主要成分为Cr^(3+)的氧化物。当电位高于0.5 V(vs SCE)时,Mo6+是决定钝化膜稳定性的主要因素。适当的Cr/Mo摩尔比可以降低钝化膜的腐蚀速率。

关 键 词：bulk metallic glasses corrosion resistance passive film electrochemical measurement Cr/Mo molar ratio 

分 类 号：TG139.8[一般工业技术—材料科学与工程]