氢气气氛中热处理对Ni-W合金镀层组织和性能的影响  

Effect of Heat Treatment in Hydrogen Atmosphere on Microstructure and Properties of Ni-W Alloy Coating

作　　者：谢蔚[1] 张亚东[1] 周琼宇[1,2,3] 成祥[1] 胡安伟[1] 张路[1] XIE Wei ZHANG Yadong ZHOU Qiongyu CHENG Xiang HU Anwei ZHANG Lu(School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 College of Material Science and Engineering, Shanghai University, Shanghai 200072 Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330029)

机构地区：[1]江西理工大学材料科学与工程学院,赣州341000 [2]上海大学材料科学与工程学院,上海200072 [3]江西省科学院应用物理研究所,南昌330029

出　　处：《材料导报》2017年第16期94-97,共4页Materials Reports

基　　金：国家自然科学基金(51504104);江西省自然科学基金(20151BAB216012;20161BAB206141);江西理工大学博士启动基金(jxxjbs15006)

摘　　要：研究了在氢气气氛中,不同的热处理温度对Ni-W合金镀层表面状态、相结构及显微硬度和耐蚀性的影响。结果表明,镀态的Ni-W合金镀层存在一种未知相(2θ≈41.4°),热处理过程中这一未知相消失,同时镀层中析出NiW、Ni_4W等沉淀相。随着热处理温度的升高,镀层的晶粒度逐渐增大,镀层在热处理过程中形成的孔隙逐渐增多。当热处理温度达到1 000℃后,镀层表面出现明显的裂纹,同时镀层中可还原形成单质W。Ni-W合金镀层的显微硬度经热处理后显著增大,热处理温度为500℃时镀层的显微硬度最大,同时镀层具有与镀态Ni-W合金相近的耐蚀性,热处理温度进一步升高后镀层的耐蚀性降低。The effect of annealing temperature on the morphology,phase composition,micro-hardness and corrosion resistance of Ni-W coating were investigated.The results show that an unidentified phase（2θ ≈41.4°）was presented in the as-plated Ni-W coating and then disappeared after annealing treatment.Meanwhile,NiW and Ni4W were precipitated in the annealed coating.As the annealing temperature increased,the grain size and porosity of coating gradually increased.Significant cracks were observed and W was found in the Ni-W coating annealed at 1 000℃ .The micro-hardness of annealed Ni-W coatings were much higher than that of asdeposited coating,while an adverse corrosion performance was observed for the annealed Ni-W coatings.The corrosion resistance became worse with the increasing annealing temperature.The coating annealed at 500 ℃ showed a biggest micro-hardness value and a fairly acceptable corrosion resistance.

关 键 词：NI-W合金 镀层 氢气气氛 热处理 显微硬度 耐蚀性 

分 类 号：TG147[一般工业技术—材料科学与工程]