Corrosion characteristics of different stainless steels, austenitic and duplex, in NaOH environment, 19PEERS

Black liquor in production is maintained to be about 50% caustic, NaOH. General corrosion behaviour in 30% to 70% NaOH of the different alloys: UNS S32304, UNS S32205, UNS S32750, UNS S32906, a proprietary duplex alloy X and commercially pure nickel (UNS N02200) were investigated. The general corrosion resistances of the different alloys were in the above stated order, with UNS N02200 tolerating the highest pure caustic concentration. Alloying element importance on the corrosion rate in pure caustic solutions was also performed by an analysis with the statistical software tool Simca P+10.0. The most important alloying elements were found to be chromium, nitrogen and nickel. Stress corrosion cracking tests were also performed in 50 % NaOH at 137C for UNS S32906. UNS S32906 experienced no stress corrosion cracking at 50 % NaOH, 137C. 

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