Enhancing mechanical properties and corrosion resistance of nickel-aluminum bronze via hot rolling process

作     者：Yanhua Zeng Fenfen Yang Zongning Chen Enyu Guo Minqiang Gao Xuejian Wang Huijun Kang Tongmin Wang Yanhua Zeng;Fenfen Yang;Zongning Chen;Enyu Guo;Minqiang Gao;Xuejian Wang;Huijun Kang;Tongmin Wang

作者机构：Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第61卷第2期

页      面：186-196页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Key Research and Development Program of China(No.2017YFA0403803) the National Natural Science Foundation of China(Nos.51525401,51834009,51927801,51901034,51974058) the Liaoning Revitalization Talents Program(No.XLYC1808005) 

主　　题：Nickel-aluminum bronze Hot rolling Mass loss EIS Selective phase corrosion 

摘      要：The mechanical properties and corrosion behavior of as-cast, as-annealed and hot-rolled nickelaluminum bronze(NAB) alloy(Cu-9 Al-10 Ni-4 Fe-1.2 Mn, all in wt.%) in 3.5 wt.% Na Cl solution were investigated. The results show that annealing introduces a large number of k phases to precipitate in the k phase. However, after further hot rolling, the original continuous k phases are spheroidized and dispersed, increasing the strength, hardness, and elongation of the alloy. In addition to the enhanced mechanical properties, the corrosion resistance of the NAB samples is also improved significantly by hot rolling, as revealed by the mass loss measurements, electrochemical impedance spectroscopy(EIS), and cross-sectional corrosion morphology. Selective phase corrosion occurs by the preferential corrosion of the k phase, which acts as an anode to the k phases, and the uncorroded k phases are retained in the corrosion product film. The interfaces between the k phases and the surrounding corrosion products become discontinuous caused by the spheroidization of k phases, reducing the corrosion of the substrate by the corrosive medium via the channels. As a result, the corrosion rate and the maximum local corrosion depth of the hot-rolled NAB sample are greatly reduced.