Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 13, Issue 12, Pages 12099-12117Publisher
ESG
DOI: 10.20964/2018.12.50
Keywords
DC stray current; X70 steel; corrosion; linear fitting method; polarization resistance
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To investigate polarization characteristics of X70 steel at direct current densities in the 50 similar to 1200 A/m(2) range under anodic and cathodic interferences, electrochemical method was used to test Tafel polarization curves. The critical current density was 180 A/m(2) and equal or above this value the Tafel polarization curves were linear. By fitting these curves, we obtained polarization resistance R-p, which can be used to characterize the polarization characteristics of X70 steel at DC current. R-p decreased with an increase in the DC current density under both cathodic and anodic interferences. Relational between R-p and DC current density was calculated. As the anodic interference current density increased, corrosion potential of X70 steel shifted positively. Opposite behavior is observed in the case of cathodic interference.
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