Stress Corrosion Cracking in Continuous Digesters: Role of Organic Compounds in Pulping Liquors, TAPPICon26

This paper examines a specific organic compound found in pulping liquors, which has been previously identified as a corrosion activator in literature. This laboratory-based study uses potentiodynamic and slow-strain-rate experiments, which were conducted on carbon-steel working samples held in an autoclave at 120 °C, using both synthetic liquor samples and industry liquor samples to assess cracking susceptibility. Characterization of the inorganic phases of pulping liquors included measurements of effective alkali and sulphidity, while the organic phase was added in specific dosages to draw correlations with crack susceptibility. This work demonstrates how organic compounds such as catechol either inhibit or increase susceptibility to stress corrosion cracking of A516 grade 70 in simulated continuous digester environments based on elongation in potentiostatic studies, and maximum crack depth. In this work, the presence of catechol resulted in an increase in crack size measured post experiments.

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