Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2116-2121
© 2016 The Japan Institute of Metals and Materials

Effect of Molybdenum on the Corrosion of Low Alloy Steels in Synthetic Seawater

Su-Bin Shin1, Sol-Ji Song1, Young-Woong Shin1, Jung-Gu Kim1, Byung-Joon Park2 and Yong-Chan Suh2

1Department of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, South Korea
2Heavy Plate R&D Team of R&D Center, Hyundai-Steel Company, 167-32 Kodae-Ri, Songak-Eup, Dangjin 343-823, South Korea

The alloying effect of Mo on the seawater immersion corrosion for low alloy steel was investigated using weight loss tests and electrochemical impedance spectroscopy (EIS) in seawater. The Mo-containing low alloy steel showed an excellent corrosion resistance by the long immersion test due to the formation of homogeneous rust layer preventing active dissolution. SEM and XPS analyses were conducted to observe cross-sectional images of rust layer and indentify chemical composition of oxide formed on the surface after immersion test. The results revealed that the MoO42− ions which were oxidized from Mo form the compounds which disturb the approach of aggressive ions.

[doi:10.2320/matertrans.M2016222]

(Received 2016/06/17; Accepted 2016/09/15; Published 2016/11/25)

Keywords: corrosion resistance, electrochemical impedance spectroscopy, molybdenum, seawater, X-ray photoelectron spectroscopy

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