Abstract
Abstract In some pulp mills black liquor is oxidized to control odor as well as to allow an increase in pulp production in recovery boiler capacity-limited mills. The oxidation of black liquor affects the liquor chemical composition, which can affect the corrosivity of black liquors. Stress corrosion cracking (SCC) and general corrosion susceptibility of commonly used materials—carbon steel (A516-Grade 70 [UNS K02700]), austenitic stainless steel (Type 304L [UNS S30403]), and duplex stainless steels (2205 [UNS S32205] and 2304 [UNS S32304])—were evaluated for use in southern hardwood black liquor and an equivalent oxidized black liquor from the same mill. The liquors were analyzed for their inorganic composition to identify the reasons for changes in their corrosivity. Results indicate that the incomplete oxidation of liquor may lead to increased concentrations of hydroxide and thiosulfate in the liquor and can increase susceptibility of austenitic stainless steels to undergo SCC. Duplex stainless steels ...
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