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Advances in Materials Science and Engineering
Volume 2015, Article ID 931761, 7 pages
http://dx.doi.org/10.1155/2015/931761
Research Article

Analysis of the Long-Term Corrosion Behavior of X80 Pipeline Steel in Acidic Red Soil Using Electrical Resistance Test Technique

1Institute of Corrosion and Protection, Northwestern Polytechnical University, Xi’an 710072, China
2School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Received 25 January 2015; Accepted 9 June 2015

Academic Editor: Holger von Wenckstern

Copyright © 2015 Shuaixing Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The long-term corrosion rate of X80 steel in an acidic red soil was monitored in situ by using a precise electrical resistance (ER) test system. The corrosion characteristics of X80 steel were examined via SEM, EDS, and XRD. The results indicated that the corrosion rate determined from ER test was very similar to that obtained from the mass loss test. The ER test technique made it possible to predict the long-term corrosion rate of steel in soil in situ. The corrosion rate of X80 steel in acidic red soil was about 0.0902 mm/a at 38 weeks, but the corrosion rate was dropped to 0.0226 mm/a after 5 years. The final corrosion product layer was composed mainly of FeOOH, γ-Fe2O3, and FeCO3.