纳米晶Ni-Co-Fe-P合金镀层在3.5wt.%NaCl溶液中的腐蚀特性  

Corrosion Behaviour of Nanocrystalline Ni-Co-Fe-P Alloy Coatings in 3.5wt.% NaCl Solution

作　　者：林兰芳[1] 戴品强[2,3] 林绿波[2] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]福州大学材料科学与工程学院,福建福州350108 [3]福建工程学院材料科学与工程学院,福建福州350108

出　　处：《材料科学与工程学报》2013年第2期229-234,共6页Journal of Materials Science and Engineering

基　　金：福建省自然科学基金资助项目(2012J01202)

摘　　要：用脉冲电沉积方法制备纳米晶Ni-Co-Fe-P合金镀层。采用X射线衍射(XRD),透射电镜(TEM),扫描电镜(SEM),能谱分析(EDS)等测试方法研究合金镀层的微观结构、表面形貌和合金成分;采用电化学极化曲线的方法测定合金镀层的腐蚀特性。结果表明随着P加入导致合金镀层晶粒细化,并随P含量的增加镀层从纳晶向非晶转变;纳晶Ni-40.41%Co-6.16%Fe-1.63%P合金镀层经600℃退火1h后,其平均晶粒尺寸从8.3nm长大至160.8nm。合金镀层的点蚀抗力随着镀层中P含量的增加而明显增强;合金镀层的腐蚀速率随晶粒尺寸的增大而减小,存在典型的晶粒尺寸效应。Nanocrystalline （nc） Ni Co Fe P alloy coatings were prepared by pulsed electrical deposition. Microstructure, surface morphology and composition of the nc Ni-Co-Fe-P alloy coatings were tested by means of XRD, TEM, SEM, EDS. The corrosion behavior of the alloy coatings was also investigated by means of Tafel polarization curves. The results show that the addition of P resulted in the decrease of grains size of the coatings. Further increase of P addition made the microstructure of coatings change from nanocrystalline to amorphous. After annealing at 600~C the grain size of Ni-40.41~Co-6.16 ~//00Fe-1.63~P coating increased from 8.3 nm to 160.8 nm. The spot corrosion resistance of the coatings increased dramatically as P increased. The corrosion rate of the coatings decreased with increasing the grain size, showing the typical grain size effect on corrosion behavior.

关 键 词：脉冲电沉积 纳米晶 Ni—Co—Fe—P 腐蚀特性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]