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98116 Effects of C and N on Corrosion Resistance of High Cr Alloys in CO2 and H2S Environments.

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Product Number: 51300-98116-SG
ISBN: 98116 1998 CP
Author: Katsumi Masamura, Yasuto Inohara, Yusuke Minami,
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In CO2 environments. corrosion rate of 12-13% Cr alloys depends on carbon and nitrogen contents, because C and N form carbides and nitrides reducing Cr content in matrix. From chemical analysis of extracted residuals. a new index Creff accounting N is proposed as following. Creff = Cr - 10(C+N) Good correlations were found between Creff and corrosion rate of high Cr alloys in CO2 environment. Results of polarization measurements indicate that C and N mainly control anodic behavior in high pH solutions. In NACE solution saturated with 1 atm H2S and low pH number. the precipitation of carbides and nitrides accelerated cathodic reaction resulting in high corrosion rate Keywords: carbon dioxide, hydrogen sulfide, carbide, stainless steel
In CO2 environments. corrosion rate of 12-13% Cr alloys depends on carbon and nitrogen contents, because C and N form carbides and nitrides reducing Cr content in matrix. From chemical analysis of extracted residuals. a new index Creff accounting N is proposed as following. Creff = Cr - 10(C+N) Good correlations were found between Creff and corrosion rate of high Cr alloys in CO2 environment. Results of polarization measurements indicate that C and N mainly control anodic behavior in high pH solutions. In NACE solution saturated with 1 atm H2S and low pH number. the precipitation of carbides and nitrides accelerated cathodic reaction resulting in high corrosion rate Keywords: carbon dioxide, hydrogen sulfide, carbide, stainless steel
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