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98168 Corrosion of High Purity Fe-Cr-Ni alloys in 13 N Boiling Nitric Acid

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Product Number: 51300-98168-SG
ISBN: 98168 1998 CP
Author: Joji Ohta, Masami Mayuzumi, Hideo Kusanagi, Hiroshi Takaku
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Corrosion in boiling nitric acid was investigated for high purity Fe-18%Cr-12%Ni alloys and type 304L stainless steels (SS). Owing to very low impurity concentration, the solution treated high purity alloys show almost no intergranular corrosion while the type 304L SS show severe intergranular corrosion. Both in the high purity alloys and type 304L SS, aging treatments ranging from 873 K to 1073 K for 1 h enhance intergranularcorrosion. During the aging treatments, impurities should be segregated to the grain boundaries. The corrosion behaviors were discussed from a standpoint of impurity segregation to grain boundaries. Keywords: austenitic high purity alloy, nitric acid, intergranular corrosion, phosphorus segregation, segregation energy
Corrosion in boiling nitric acid was investigated for high purity Fe-18%Cr-12%Ni alloys and type 304L stainless steels (SS). Owing to very low impurity concentration, the solution treated high purity alloys show almost no intergranular corrosion while the type 304L SS show severe intergranular corrosion. Both in the high purity alloys and type 304L SS, aging treatments ranging from 873 K to 1073 K for 1 h enhance intergranularcorrosion. During the aging treatments, impurities should be segregated to the grain boundaries. The corrosion behaviors were discussed from a standpoint of impurity segregation to grain boundaries. Keywords: austenitic high purity alloy, nitric acid, intergranular corrosion, phosphorus segregation, segregation energy
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