Effects of Er addition and cooling rate on the corrosion resistance of Zn-5Al alloys

• Published in: Materials science and technology Vol. 39; no. 8; pp. 1030 - 1038
• Main Authors: Ge, Zhen, Huang, Chengcong, Qi, Liang, Tang, Liang, You, Shengyi
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 24.05.2023; SAGE Publications
• Subjects: corrosion resistance; microstructure; Zn-5Al alloy; microstructure; Zn-5Al alloy; Er; corrosion resistance
• ISSN: 0267-0836; 1743-2847
• DOI: 10.1080/02670836.2022.2157529

Galfan (Zn-5Al-RE) coating is widely used in high-strength steel wires. The effects of cooling rate and the adulteration of erbium (Er) on the microstructure and corrosion resistance of Zn-5Al alloys were investigated in this study. The results show that the Zn-5Al alloy is made up of the primary η-Zn phase and eutectic structure at a high cooling rate. As the cooling rate decreases, the corrosion current firstly increased and then decreased due to decrease of the primary η-Zn content , the appearance and grew of α-Al phase. Moreover, the addition of Er leads to the formation of Er-containing intermetallic compounds in the Zn-5Al alloy, reducing the size of the primary η-Zn and α-Al phase, decreasing the corrosion current density, and improving the density and compactness of the corrosion product.