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J Chin Soc Corr Pro  2010, Vol. 30 Issue (1): 46-50    DOI:
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CHARACTERISTIC OF X70 PIPELINE STEEL IN THE KU'ERLE SOIL ENVIRONMENT
LIU Zhiyong;DU Cuiwei;LI Xiaogang;JIA Gaifeng
Key Lab of Corrosion Erosion and Surface Technique Beijing; Corrosion and Protection Center;University of Science and Technology Beijing; Beijing 100083
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Abstract  

Corrosion characteristic of X70 pipeline steel in a high saliferous and alkaline soil environment, named Ku'erle soil, was investigated by burying tests both in lab and nature field, micro-morphology analyses and electrochemical polarization technique. The X70 pipeline steel would form a protective corrosion product film, leading to a relative low dissolution current, however, the anodic current in local corrosion area, or in fresh surface without film covering, is much more intensive than the usual metal surface covered with productive film, indicating that X70 pipeline steel is susceptible to local corrosion. The characteristic of these localizing corrosion is non-uniform corrosion and visible corrosion pits observed in a magnifying scale, and in a mode of intergranular corrosion under micro scale observation.

Key words:  X70 pipeline steel      Soil in Ku’erle      Corrosion     
Received:  12 May 2008     
ZTFLH: 

TG 172.4

 
Corresponding Authors:  LIU Zhiyong     E-mail:  liuzhiyong7804@126.com

Cite this article: 

LIU Zhiyong;DU Cuiwei;LI Xiaogang;JIA Gaifeng. CHARACTERISTIC OF X70 PIPELINE STEEL IN THE KU'ERLE SOIL ENVIRONMENT. J Chin Soc Corr Pro, 2010, 30(1): 46-50.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2010/V30/I1/46

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