Keywords
Corrosion, passive film, Ni-Cu coating, polarization, vacancies. Chống ăn mòn, màng thụ động, lớp phủ Ni-Cu, phân cực điện động, lỗ trống.
How to Cite
ĐỖ QUANG, Q., & CÙ HUY, C. (2022). SITE-BLOCKING EFFECT OF Ce ON THE PASSIVE FILM FORMED ON Ni-Cu COATINGS. Journal of Marine Science and Technology, 65(65), 33–38. Retrieved from https://jmst.vimaru.edu.vn/index.php/tckhcnhh/article/view/111
Abstract
In this work, Ni-Cu coatings were obtained using the pulse current electrodeposition technique from electrolyte with 0, 150, 190 and 230mg/L ceric sulfate. The modification of Ce on microstructure and electrochemical of Ni-Cu coatings were examined. The composition of the passive film forms on samples were examined. The results demonstrate that Ni-Cu coating synthesized from 190 mg/L ceric sulfate in the bath shows the best corrosion resistance, Ce accumulates close to the interface (coating/passive film) and gives rise to a “site-blocking” effect on the outward transport of the oxygen vacancies and inward transport of cation vacancies. Ce accumulation enhances the corrosion resistance of Ni-Cu coatings.