Optimization of electrodeposition nanocrytalline Ni-Fe alloy coatings for the replacement of Ni coatings

纳米晶材料 材料科学 合金 冶金 计时安培法 成核 循环伏安法 腐蚀 涂层 金属间化合物 粒度 转化膜 表面粗糙度 化学工程 复合材料 电化学 纳米技术 电极 工程类 有机化学 化学 物理化学
作者
Yaqiang Li,Xiaofeng Cai,Zhang Guang-qian,Chuanjin Xu,Weirong Guo,Maozhong An
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:903: 163761-163761 被引量:45
标识
DOI:10.1016/j.jallcom.2022.163761
摘要

Fabricating nanocrystalline Ni-Fe alloy coatings with excellent brightness and corrosion resistance could reduce the use of Ni and benefit economically. Nanocrystalline Ni-Fe alloy coatings were electrodeposited on steel substrates and the coatings with 34.55% Fe content were achieved at the optimized conditions with the current efficiency high up to 80.30%. The electrodeposition behavior of Ni-Fe coatings was investigated by cyclic voltammetry (CV), chronopotentiometry and chronoamperometry. CV tests illustrate that Ni2+ and Fe2+ are co-electrodeposited to form single phase and the deposition of Ni is inhibited by the presence of Fe2+ while the deposition of Fe is boosted by the Ni2+ according to chronopotentiometry. The nucleation and growth of nanocrystalline Ni-Fe alloy coatings is 3D diffusion-controlled instantaneous nucleation process. Intermetallic compound, namely Ni3Fe phase, was formed according to XRD analysis and TEM analysis, while the mean grain size is 4.79 nm. SEM and AFM images demonstrate that nanocrystalline and compact surface were fabricated and the roughness is lower than 5 nm, better than pure Ni coating. Due to the nanocrystalline and compact surface, the icorr and Rct of nanocrystalline Ni-Fe alloy coating are 0.7544 μA cm−2 and 8560 Ω respectively, indicating that Ni-Fe alloy coating is of good corrosion resistance.
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