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98698 “EFFECT OF EXPOSURE TIME ON CORROSION RESISTANCE OF PREPASSIVATED UNS S31603 SS IN THE GULF OF MEXICO”

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Product Number: 51300-98698-SG
ISBN: 98698 1998 CP
Author: N.A. Gonzalez, G. Hernandez-Duque
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The effect of exposure time, in the Gulf of Mexico, on the UNS S31603 stainless steel (SS) pitting corrosion resistance (PCR), was studied for 30 days using both open circuit potential (OCP) and potentiodynamic polarization (PP) techniques. Biofilm formation and corrosion attack were subsequently observed using scanning electron microscope (SEM) and atomic force microscopy (AFM). It was found that microorganisms colonizing the steel specimen’s surface during the first three days of testing, modified the OCP towards electropositive values, increasing the risk of pitting corrosion. It was also observed, that the SS specimens were most sensitive to pitting corrosion within the first fifteen days of exposure in seawater, decreasing this sensitivity during the last week, probably due to a decay in the biological activity and better behaviour of the passive film. Keywords: Marine corrosion, stainless steel, passive film, pitting corrosion, microbially influenced corrosion (MIC).
The effect of exposure time, in the Gulf of Mexico, on the UNS S31603 stainless steel (SS) pitting corrosion resistance (PCR), was studied for 30 days using both open circuit potential (OCP) and potentiodynamic polarization (PP) techniques. Biofilm formation and corrosion attack were subsequently observed using scanning electron microscope (SEM) and atomic force microscopy (AFM). It was found that microorganisms colonizing the steel specimen’s surface during the first three days of testing, modified the OCP towards electropositive values, increasing the risk of pitting corrosion. It was also observed, that the SS specimens were most sensitive to pitting corrosion within the first fifteen days of exposure in seawater, decreasing this sensitivity during the last week, probably due to a decay in the biological activity and better behaviour of the passive film. Keywords: Marine corrosion, stainless steel, passive film, pitting corrosion, microbially influenced corrosion (MIC).
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