期刊
APPLIED SURFACE SCIENCE
卷 442, 期 -, 页码 446-460出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.02.115
关键词
Microstructure; Localized corrosion; Dislocation; Volta potential
类别
资金
- National Key Research and Development Program of China [2017YFB0702100]
CO2 corrosion behavior of carbon steel with different microstructures (H steel: coarse laminar pearlite; T steel: globular and shot rod shaped pearlite) was analyzed in 3 wt.% NaCl solution at 60 degrees C with imidazoline-based inhibitor by electrochemical and weight loss methods. Electrochemical measurements showed that, compared to H steel, the inhibitor film adsorbed on T steel had a higher pitting corrosion resistance and the inhibition efficiency for T steel was larger at each concentration of inhibitor. Weight loss results exhibited that both steels suffered general corrosion in absence of inhibitor; however, localized corrosion was observed on the samples with insufficient concentration of inhibitor. H steel suffered more severe localized corrosion than T steel, it was related to that H steel had a higher density of dislocations in the pearlite area and the larger driving force for galvanic corrosion. The localized corrosion on H steel mainly distributed on the laminar pearlite area. (C) 2018 Elsevier B.V. All rights reserved.
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