Electrochemical behaviour of ternaryNi-Zn-P thin films depositionon steel substrate

Indian Journal of Chemical Technology

Popescu, Ana-Maria¹ 

关键词: Corrosion;    Thin films;    Ni-Zn-P;    Electrodeposition;    Sulphate;    Corrosion test;   

DOI  :  

学科分类：化学（综合）

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

Ternary Ni-Zn-P alloy thin films  with a thickness of 15-20 μm are considered as a replacement for cadmium sacrificial coatings for anticorrosive protection of steel parts working in highly corrosive media. Anticorrosive Ni-Zn-P thin films has been electrochemically deposited from aqueous sulphate solutions on carbon steel substrate. The influence of bath composition (variable ZnSO₄·7H₂O contents) and electrodeposition type (potentiostatic or galvanostatic) on physical-chemical and corrosion characteristics of obtained films have been studied. Films are characterized by energy dispersive analysis (EDAX) and scanning electron microscopy (SEM). The corrosion tests are performed in 3% NaCl solution with optimal resulting values of -916.2 mV vs. saturated calomel electrode (SCE) for the corrosion potential and 13.4 μA·cm^-2 for the corrosion current density. The calculated value for the corrosive attack protection efficiency is 67.7%.

【 授权许可】

CC BY-NC-ND