Journal
CORROSION
Volume 75, Issue 9, Pages 1034-1043Publisher
NATL ASSOC CORROSION ENG
DOI: 10.5006/3195
Keywords
carbon steel; Cl-; HCO3-; electrochemical characterizations; pitting corrosion
Funding
- Key Scientific Research Project in Shanxi Province [MC2016-06, 201603D111004, 20181101014, 201805D121003]
- Shanxi Scholarship Council of China [2017-029]
- Patent Promotion and Implement Found of Shanxi Province [20171003]
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Pitting corrosion behavior of AISI 1020 carbon steel exposed to natural aeration and solutions containing Cl- or/and HCO3- was investigated using electrochemical and surface characterizations. The results reveal a synergistic effect of HCO3- and Cl- on pitting corrosion behavior of carbon steel. HCO3- serves as the main source of hydrogen and acts as a reactant to promote the formation of FeCO3/Fe2O3/Fe3O4 films as corrosion product, which are a prerequisite for pitting initiation and propagation. Cl- contributes to the catalytic dissolution of the Fe matrix, film breakdown, and diffusion within the occluded cavity, thereby significantly enhancing the pitting corrosion of carbon steel.
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