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99620 EFFECT OF SULFITE IONS IN N2 AND CO2 PURGED 0.5 M NACL SOLUTION ON STAINLESS STEELS EXAMINED BY DIFFERENT ELECTROCHEMICAL TECHNIQUES AND BY REFLECTANCE MEASUREMENTS

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Product Number: 51300-99620-SG
ISBN: 99620 1999 CP
Author: T.Hemmingsen, N. O.Aagotnes, T. Kroeger-Silseth, N. Kolak and M. Kaik
Industries: Chemical Inhibitors , Oil and Gas Production
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Three steels, 13% Cr-steel, SS 304 steel and duplex steel are examined for corrosion for 48-hours periods in N2 or CO2 purged 0.5 M sodium chloride electrolytes with different sulfite concentrations. The results show that 13% Cr-steel is most susceptible to pitting in the presence of sulfite both under N2 and CO2 atmospheres. SS 304 steel was more resistant to corrosion than 13% Crsteel. Duplex steel showed rather good corrosion resistance under these conditions. The corrosion rate, inclusive pitting corrosion, after 24 hours in presence of 0-10 mM sulfite based on LPR-measurements is for duplex steel 0.5 – 0.9 mm/year under N2 and 0.1 - 1.8 mm/year under CO2, for SS 304 steel 1.0 – 1.8 mm/year under N2 and 0.6- 1.4 mm/year under CO2, and for 13% Cr-steel 1.3 – 2.2 mm/year under N2 and 0.7- 1.8 mm/year under CO2. The use of AC-impedance measurements is discussed. The method should be used with care when other mechanisms than general corrosion are involved.
Three steels, 13% Cr-steel, SS 304 steel and duplex steel are examined for corrosion for 48-hours periods in N2 or CO2 purged 0.5 M sodium chloride electrolytes with different sulfite concentrations. The results show that 13% Cr-steel is most susceptible to pitting in the presence of sulfite both under N2 and CO2 atmospheres. SS 304 steel was more resistant to corrosion than 13% Crsteel. Duplex steel showed rather good corrosion resistance under these conditions. The corrosion rate, inclusive pitting corrosion, after 24 hours in presence of 0-10 mM sulfite based on LPR-measurements is for duplex steel 0.5 – 0.9 mm/year under N2 and 0.1 - 1.8 mm/year under CO2, for SS 304 steel 1.0 – 1.8 mm/year under N2 and 0.6- 1.4 mm/year under CO2, and for 13% Cr-steel 1.3 – 2.2 mm/year under N2 and 0.7- 1.8 mm/year under CO2. The use of AC-impedance measurements is discussed. The method should be used with care when other mechanisms than general corrosion are involved.
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