Pitting corrosion resistance of a novel duplex alloy steel in alkali-activated slag extract in the presence of chloride ions

Jin-jie Shi; Jing Ming; Xin Liu

doi:10.1007/s12613-017-1504-4

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1134-1144

Jin-jie Shi, Jing Ming, and Xin Liu, Pitting corrosion resistance of a novel duplex alloy steel in alkali-activated slag extract in the presence of chloride ions, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1134-1144. https://doi.org/10.1007/s12613-017-1504-4

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Jin-jie Shi, Jing Ming, and Xin Liu, Pitting corrosion resistance of a novel duplex alloy steel in alkali-activated slag extract in the presence of chloride ions, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1134-1144. https://doi.org/10.1007/s12613-017-1504-4

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Research Article

Pitting corrosion resistance of a novel duplex alloy steel in alkali-activated slag extract in the presence of chloride ions

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Corresponding author:
Jin-jie Shi E-mail: jinjies@126.com
Received: 2 March 2017; Revised: 2 May 2017; Accepted: 5 May 2017

Abstract

Abstract

In this study, two types of reinforcing steels (conventional low-carbon steel and a novel duplex alloy steel with Cr and Mo) were exposed to chloride-contaminated extract solutions (ordinary Portland cement (OPC) extract and alkali-activated slag (AAS) extract) to investigate their pitting corrosion resistance. The results confirm that the pitting corrosion resistance of the alloy steel is much higher than that of the low-carbon steel in both extract solutions with various NaCl concentrations. Moreover, for each type of steel, the AAS extract contributes to a higher pitting corrosion resistance compared with the OPC extract in the presence of chloride ions, likely because of the formation of flocculent precipitates on the steel surface.
- pitting corrosion resistance;
- alloy steel;
- alkali-activated slag;
- chloride ions;
- electrochemical impedance spectroscopy;
- cyclic potentiodynamic polarization

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