中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 25 No. 8 August 2015 |
(Chemistry Department, Faculty of Science Sohag, Sohag University, Sohag 82524, Egypt)
Abstract:Zn plays an important role in the protection of iron and steel from corrosion in sea water, and the alloying of Zn and Ni can improve its corrosion resistance. The corrosion behavior of Zn-Ni alloys in synthetic sea water (3.5% NaCl, mass fraction) was studied using Tafel plot and electrochemical impedance spectroscopy (EIS) techniques. The corrosion resistance of the investigated alloys with various Ni contents (0.5%-10%, mass fraction) was compared with that of Zn. The results show that the corrosion resistance of Zn-Ni alloys (except 0.5% Ni) is superior to that of Zn. The 10% Ni gives the highest corrosion resistance due to the formation of γ-Zn3Ni with γ-ZnNi phases in the alloy. In the case of alloy I (0.5% Ni), it exhibits a higher corrosion rate (less corrosion resistance) than Zn.
Key words: Zn-Ni alloy; Ni content; corrosion resistance; Cl- ions; impedance; polarization