Effect of Sb and Mn alloying additions on the Corrosion Behaviour of Zn

J Chin Soc Corr Pro

2008, Vol. 28

Issue (5): 257-264 DOI:

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Effect of Sb and Mn alloying additions on the Corrosion Behaviour of Zn

中国科学院金属研究所金属腐蚀与防护国家重点实验室

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Abstract The effects of alloying elements Sb（1 %）and Mn（0.5% and 1%）on the corrosion behaviour of Zn have been studied in 0.1 M NaCl and 0.1 M NaCl + 0.1 M Na2SO4 + 0.01 M NaHCO3 solutions by potentiodynamic polarizations, linear polarization, SEM investigations and XPS analysis. The results indicate that Sb presents only in the Sb-rich intermetallic particles. Compared with Zn matrix, the Sb-rich phases had no significant effect on both cathodic and anodic behaviour of Zn. Mn was found in both the Mn-rich intermetallic particles and the Zn matrix. Electrochemical measurements revealed that Mn in solid solution can reduce the oxygen reduction on Zn and had no significant effect on the anodic behaviour of Zn in 0.1M NaCl solution. In the simulated solution of marine environment (0.1 NaCl + 0.1 Na2SO4 + 0.01 M NaHCO3), 0.5%Mn can significantly increase the corrosion resistance of Zn through the mechanism that it can produce a more compact film and influence ion migration through the pores in the film.

Key words: Zn alloying additions polarization curve microstructure XPS

Received: 17 September 2007

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. Effect of Sb and Mn alloying additions on the Corrosion Behaviour of Zn. J Chin Soc Corr Pro, 2008, 28(5): 257-264 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I5/257

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