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Crevice corrosion behavior of X70 steel in acid soil enviroment

  • Xu Chen*
  • , Xiao Gang Li
  • , Cui Wei Du
  • , Liang Ping
  • *Corresponding author for this work
  • University of Science and Technology Beijing

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A rectangle crevice assembly was used to investigate the effects of cathodic protection (CP) potential, bubbling CO 2 and surface condition on the crevice corrosion of X70 steel under disbonded coating. Results show that the solution within the crevice becomes more alkaline due to the reduction of dissolved oxygen. As a result, the potential of the steel reaches the protected potential range and thus the protection distance becomes longer when the applied CP potential is more negative. The IR drop mainly occurs in the vicinity of the opening. However, the introduction of CO 2 into the solution prevents the formation of an alkaline environment and forms a nearly neutral SCC potential-pH environment in the crevice. In addition, it is also found that the pre-corrosion product layer significantly decreases the polarization rate in the crevice.

Original languageEnglish
Title of host publication17th International Corrosion Congress 2008
Subtitle of host publicationCorrosion Control in the Service of Society
Pages1855-1865
Number of pages11
StatePublished - 2008
Externally publishedYes
Event17th International Corrosion Congress 2008: Corrosion Control in the Service of Society - Las Vegas, NV, United States
Duration: 6 Oct 200810 Oct 2008

Publication series

Name17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
Volume3

Conference

Conference17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
Country/TerritoryUnited States
CityLas Vegas, NV
Period6/10/0810/10/08

Keywords

  • Cathodic protection
  • Crevice corrosion
  • Polarization
  • X70 steel

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