Passivation Effect of Rare Earth Lanthanum on Galvanized Steel

Abstract:

By way of chemical marinate method, carrying out rare earth lanthanum to corrosion protect galvanized steel. The process of rare earth lanthanum conversion coating for galvanized steel was studied by using orthogonal experiment to get the optimized passivation parameters when the concentration of La (NO₃) is 30g/L, H₂O₂ is 20ml/L, pH=4 and was passivated at 40°C for 30s. The corrosion resistance was examined by weight loss tests, neutral salt spray tests (NSS) and electrochemical impedance spectroscopy (EIS). The results showed that the corrosion impedance of the pretreated sample was significantly improved, the corrosion rate was decreased by one order of magnitude, and the anti-white rust time was 54h.

• Periodical: Applied Mechanics and Materials (Volume 525)
• Pages: 31-34
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.525.31
• Online since: February 2014
• Authors: Xiao Feng Liu*
• Keywords: Corrosion Resistance, Galvanized Steel, Orthogonal Experiment, Rare Earth Lanthanum

References

[1] Zin IM. Materials Science, Vol. 450-453 (2000).

[2] Mekhalif Z, Forget L, Delhalle J. Corrosion Science, Vol. 547-566 (2005).

[3] Hua L，Chan YC，WU Y P. Journal of Hazardous Materials, Vol. 1360-1368 (2009).

[4] Yang N, Long JM. Chinese Rare Earths, Vol. 55-61 (2002). [in Chinese].

[5] Lu J, Wu H, Kong G, et al., Transactions of Nonferrous Metals Society of China, Vol. 1397-1401 (2006).

[6] Trabelsi W, Cecilio P, Ferreira MG., et al., Progress in Organic Coatings, Vol. 276(2005).

[7] Montemor M F, Simões A M, Ferreira M G S. Progress in Organic Coatings, Vol. 111 (2002).

[8] Hosseini M, Ashassi-Sorkhabi H, Ghiasvand H A Y. Journal of Rare Earths, Vol. 537 (2007).

[9] Lu J T, Wu H J, Kong G, Che C S, Xu Q Y. Transactions of Nonferrous Metals Society of China, Vol. 1397 (2006).