The effects of n-hexylamine acting as an inhibitor in stress corrosion cracking (SCC) of A533B CL.1 (UNS(1) K12539) and sensitized type 304 (UNS S30400) stainless steels (SS) in pressurized high-temperature waters have been investigated. Characteristics of SCC were measured by the slow strain rate technique (SSRT) in pressurized high-temperature water in the absence and in the presence of n-hexylamine at a strain rate of 2.1 × 10−6 1/s under an applied potential of −200 mV (vs a standard hydrogen reference electrode [SHE]) for A533B CL. 1, and at a strain rate of 4.17 × 10−6 1/s under a free corrosion potential for sensitized type 304 SS. The n-hexylamine was found to be effective as the inhibitor of the initiation of the SCC of A533B CL. 1 steels and sensitized type 304 SS in pressurized high-temperature water.

Subject
Scanning electron microscopy, Environmental cracking, Strain rate, Crack growth, Water, Materials, Inhibitor performance, Crack initiation, Mechanical failure, Corrosion inhibitors, Steel, Stress corrosion cracking, Slow strain rate technique
National Association of Corrosion Engineers
1990
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