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98695 CRITICAL TEMPERATURES FOR CREVICE CORROSION OF HIGH-NITROGEN STAINLESS STEELS

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Product Number: 51300-98695-SG
ISBN: 98695 1998 CP
Author: James H. Russell, Bernard S. Covino
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A relatively simple electrochemical method was used to determine the critical temperatures for crevice corrosion (CCT) of a series of high nitrogen stainless steels in 3.5% NaCl solution and to compare those to critical pitting temperatures (CFT) reported previously. CCT's for several commercial stainless steels were also measured. In most cases, the critical crevice temperature was linearly related to the pitting resistance equivalence, slightly divergent from, and 10° to 30° C lower than the critical pitting temperature. The method is useful in distinguishing the relative localized corrosion resistance of those alloys whose critical pitting temperahnt was at or above the maximum temperature of the equipment. Evidence for synergy between the molybdenum and nitrogen concentrations was not convincing. Keywords: critical crevice temperature, critical pitting temperature, nitrogen stainless steels, stainless steels, corrosion, sodium chloride
A relatively simple electrochemical method was used to determine the critical temperatures for crevice corrosion (CCT) of a series of high nitrogen stainless steels in 3.5% NaCl solution and to compare those to critical pitting temperatures (CFT) reported previously. CCT's for several commercial stainless steels were also measured. In most cases, the critical crevice temperature was linearly related to the pitting resistance equivalence, slightly divergent from, and 10° to 30° C lower than the critical pitting temperature. The method is useful in distinguishing the relative localized corrosion resistance of those alloys whose critical pitting temperahnt was at or above the maximum temperature of the equipment. Evidence for synergy between the molybdenum and nitrogen concentrations was not convincing. Keywords: critical crevice temperature, critical pitting temperature, nitrogen stainless steels, stainless steels, corrosion, sodium chloride
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