Journal
CORROSION SCIENCE
Volume 93, Issue -, Pages 109-119Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.01.024
Keywords
Carbon steel; AFM; XPS; Acid corrosion; Sulphidation
Funding
- Natural Science Foundation of China [51171208, 51271201]
- Science Foundation of China University of Petroleum, Beijing, China [LLYJ-2011-41]
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The initiation and various developmental stages of steel corrosion in H2S environments were investigated using atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Results revealed that grain boundaries corrode at the initiation stage and that corrosion products initially form on both sides of the grain boundary and then accumulate. Corrosion products grew at the interface between the steel and corrosion product layer at the developmental stage. XPS analyses showed the composition and valence states of the corrosion products, and a model of the formation process of corrosion product films was proposed. (C) 2015 Elsevier Ltd. All rights reserved.
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