On-line high temperature capillary electrophoresis instrument (HotUCE) was constructed for analysis of corrosive ions at normal pulping process temperatures in synthetic liquors in order to evaluate stress corrosion cracking (SCC) susceptibility of stainless steels. The HotUCE-instrument was on-line coupled to an autoclave, where welded duplex stainless steel samples were immersed 500 h in the simulated high ionic strength hot black, hot white or green liquors at temperatures below 210°C.

The results showed that only minor amounts of oxidized sulphur compounds emerged. Amounts of sulphur species correlate with the corrosion potential changes of the duplex stainless steel specimens during the cooking experiments. The increase of sulphite during cooking was higher in hot white than in hot black liquor. The results indicate that SCC risk was enhanced at higher temperatures most probably due to increased formation of thiosulphate.

Subject
Sulfur, Cooking, Liquor, Autoclaves, Sulfates, Sulfur species, Instrumentation, Thiosulfate, Sulfides, Duplex stainless steel, Stainless steel, Stress corrosion cracking, Samples
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2007
GOV
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