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Investigation of AISI 1040 steel corrosion H2S solution containing chloride ions by digital image processing coupled with in electrochemical techniques

Alexsandro Mendes Zimer and Emerson Costa Rios and Paulo de Carvalho Dias Mendes and Wesley Nunes Goncalves and Odemir Martinez Bruno and Ernesto Chaves Pereira and Lucia Helena Mascaro

CORROSION SCIENCE, 53(10):3193-3201, 2011

This paper presents a study of AISI 1040 steel corrosion in aqueous electrolyte of acetic acid buffer containing 3.1 and 31 x 10(-3) mol dm(-3) of Na2S in both the presence and absence of 3.5 wt.% NaCl. This investigation of steel corrosion was carried out using potential polarization, and open-circuit and in situ optical microscopy. The morphological analysis and classification of types of surface corrosion damage by digital image processing reveals grain boundary corrosion and shows a non-uniform sulfide film growth, which occurs preferentially over pearlitic grains through successive formation and dissolution of the film. (C) 2011 Elsevier Ltd. All rights reserved.