Corrosion Behavior of Carbon Steel in Diluted Sulfuric Acid based on Seawater
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초록
The International Maritime Organization (IMO) will administer a new 0.5% global sulfur cap on fuel contentfrom 1 January 2020, lowering from the present 3.5% limit. Seawater SOx (sulfur oxide) scrubbing is especiallyspray scrubbing and a promising alternative to complying with the IMO regulation. However, the ionizationof SO2 (sulfur dioxide) and the H2SO4 (sulfuric acid) formed from SO3 (sulfur trioxide) is proposed toaccelerate corrosion of the internal seawater pipe. Apparently, the corrosion of the scrubber seawater pipingsystem occurs in a severe and frequent manner. Hence, in this study, electrochemical measurement andweight loss of carbon steel (used as seawater pipe in most of the ships) in diluted sulfuric acid solutionwere investigated to determine corrosion rate, corrosion current density, corrosion potential, electrochemicalbehavior, and impressed-current density. Accordingly, the corrosion rate of carbon steel sheet in variousdiluted sulfuric acid solutions was observed to be greater than that in natural seawater, thus suggestingthe fundamental data to deal with corrosion problems in scrubber seawater pipe.
Abstract
The International Maritime Organization (IMO) will administer a new 0.5% global sulfur cap on fuel contentfrom 1 January 2020, lowering from the present 3.5% limit. Seawater SOx (sulfur oxide) scrubbing is especiallyspray scrubbing and a promising alternative to complying with the IMO regulation. However, the ionizationof SO2 (sulfur dioxide) and the H2SO4 (sulfuric acid) formed from SO3 (sulfur trioxide) is proposed toaccelerate corrosion of the internal seawater pipe. Apparently, the corrosion of the scrubber seawater pipingsystem occurs in a severe and frequent manner. Hence, in this study, electrochemical measurement andweight loss of carbon steel (used as seawater pipe in most of the ships) in diluted sulfuric acid solutionwere investigated to determine corrosion rate, corrosion current density, corrosion potential, electrochemicalbehavior, and impressed-current density. Accordingly, the corrosion rate of carbon steel sheet in variousdiluted sulfuric acid solutions was observed to be greater than that in natural seawater, thus suggestingthe fundamental data to deal with corrosion problems in scrubber seawater pipe.
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