TRACK: Bioprocessing & Corrosion Mechanisms
This presentation addresses common corrosion degradation mechanisms in pressure hydrometallurgical applications, including general corrosion, pitting corrosion, stress corrosion cracking, crevice corrosion, and intergranular corrosion. It focuses on the effect of halides, presence of secondary phases, and alloying elements on corrosion performance of materials and briefly describes the use and limitations of iso-corrosion curves in estimation of corrosion rates. Assessment of the long-term durability of materials for hydrometallurgical applications often requires exposure and/or accelerated laboratory testing. This presentation covers experimental design and protocols, laboratory qualifications, standard procedures (e.g., ASTM, ISO), and elaborates on test parameters (e.g., pressure, temperature, agitation), solution and coupon considerations, test durations, and techniques for solution and coupon post-test analysis for effective materials selection. The application of accelerated electrochemical techniques in durability assessment is also highlighted in this presentation.