INFLUENCE OF Cl$^{-}$ CONCENTRATION ON CREVICE CORROSION OF X70 PIPELINE STEEL

Acta Metall Sin

2009, Vol. 45

Issue (9): 1130-1134 DOI:

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INFLUENCE OF Cl$^{-}$ CONCENTRATION ON CREVICE CORROSION OF X70 PIPELINE STEEL

SONG Yiquan¹; DU Cuiwei²; ZHANG Xin²; LI Xiaogang^2;3

1) School of Material and Metallurgy; Inner Mongolia University of Science and Technology; Baotou 014010
2) The Key Lab of Corrosion; Erosion and Surface Technology of Beijing; Corrosion and Protection Center of University of Science and Technology Beijing; Beijing 100083
3) State Key Laboratory of Corrosion and Protection; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015

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SONG Yiquan DU Cuiwei ZHANG Xin LI Xiaogang. INFLUENCE OF Cl$^{-}$ CONCENTRATION ON CREVICE CORROSION OF X70 PIPELINE STEEL. Acta Metall Sin, 2009, 45(9): 1130-1134.

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Abstract

The influence of Cl^- concentration in corrosion medium to crevice corrosion of X70 pipeline steel was investigated by wedge-type crevice model. The experimental results show that under natural corrosion condition, as the crevice opening thickness is 0.15 mm and the test periodic is 120 h,\linebreak with increase of the Cl^- concentration (c^m_Cl^-) in corrosion medium outside the crevice the Cl^- concentration (c^m_Cl^-) in the crevice solution from the opening to the bottom gradually increases, the pH value in the crevice solution and the electrode potential of X70 steel samples from the opening to the bottom in the crevice gradually decrease, which indicated that crevice corrosion tendency of X70 steel increases with increase of the Cl^- concentration (c^m_Cl^-) in corrosion medium outside the crevice.

Key words: Cl^- concentration X70 pipeline steel crevice corrosion

Received: 11 May 2009

ZTFLH:

TG171

Fund:

Supported by National Natural Science Foundation of China (Nos.50301003 and 50461004) and “Spring Sunshine Plan” Research Project of Ministry of Education of China (No.Z2004-2-15022)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I9/1130

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