Crevice corrosion of N80 carbon steel in CO2-saturated environment containing acetic acid. (November 2016)

• Record Type: Journal Article
• Authors: Li, Y.Z.; Xu, N.; Liu, G.R.; Guo, X.P.; Zhang, G.A.
• Is Part Of: Corrosion science. Volume 112(2016)
• Page Start: 426
• Page End: 437
• Publication Date: 2016-11
• Subjects: A. Carbon steel -- B. EIS -- B. SEM -- C. Crevice corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.08.002
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Crevice corrosion of carbon steel occurs in the presence of acetic acid (HAc). Crevice corrosion is triggered by the galvanic effect inside and outside crevice. The corrosion of steel is promoted inside crevice while inhibited outside crevice. Deep corrosion groove appears at the crevice mouth. The crevice corrosion of steel is promoted by increasing the HAc concentration. Abstract: Crevice corrosion of N80 carbon steel in CO2 -saturated environment containing acetic acid (HAc) was studied by electrochemical measurements and surface analysis. No obvious corrosion is observed on the half-electrode outside crevice while severe corrosion occurs on the half-electrode inside crevice, and deep corrosion groove appears at the crevice mouth. Crevice corrosion of carbon steel is triggered by the galvanic effect between the two half-electrodes inside and outside crevice. Crevice corrosion is promoted by increasing the HAc concentration because the galvanic effect between the two half-electrodes inside and outside crevice is strengthened with the increase of HAc concentration.