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Influence of the complexing agent sodium citrate on the chemical composition, surface morphology and corrosion resistance of Ni–Fe electrodeposits
Transactions of the IMF ( IF 1.9 ) Pub Date : 2019-08-27 , DOI: 10.1080/00202967.2019.1643586
G. P. da Silva 1 , R. N. de Lima 1 , F. J. N. Santos 1 , F. P. S. de Menezes 1 , L. P. L. Morais 1 , L. F. da Silva Filho 1
Affiliation  

ABSTRACT A comparative study has been made of the influence of the complexing agent, sodium citrate, on the characteristics of Ni–Fe alloys obtained by electrodeposition. The alloys were synthesised from modified Watts electrolytes with different proportions of Ni2+ and Fe3+ ions. Energy-dispersive X-ray spectroscopy (EDS) analyses showed that the coatings obtained from electrolytes without sodium citrate (CWOCs) had higher Fe values than Ni and those obtained with electrolytes containing complexing agent (CWCs) presented an inverse behaviour. Micrographs obtained by scanning electron microscopy (SEM) showed the formation of uniform, homogeneous and nodular deposits, typical of Ni coatings. However, the presence of microcracks and porosity in the CWCs was verified. Potentiodynamic linear polarisation (PLP) and electrochemical impedance spectroscopy (EIS) analysis identified corrosion processes with active dissolution in 0.1 mol L−1 NaCl medium in all the analysed deposits, with the CWOCs being more resistant than the CWCs.

中文翻译:

络合剂柠檬酸钠对Ni-Fe电沉积物化学成分、表面形貌和耐腐蚀性能的影响

摘要 对络合剂柠檬酸钠对电沉积镍铁合金特性的影响进行了比较研究。这些合金是由具有不同比例的 Ni2+ 和 Fe3+ 离子的改性瓦特电解质合成的。能量色散 X 射线光谱 (EDS) 分析表明,从不含柠檬酸钠 (CWOCs) 的电解质中获得的涂层的 Fe 值高于 Ni,而那些用含有络合剂 (CWCs) 的电解质获得的涂层表现出相反的行为。通过扫描电子显微镜 (SEM) 获得的显微照片显示形成了均匀、均质和结节状沉积物,这是镍涂层的典型特征。然而,证实了 CWC 中存在微裂纹和孔隙。
更新日期:2019-08-27
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