Abstract
The effect of aging heat treatment on the microbiologically influenced corrosion (MIC) of 17–4PH stainless steel by Pseudomonas aeruginosa was investigated. The presence of P. aeruginosa promoted the pitting corrosion of 17–4PH stainless steel. With the increase of aging temperature from 480 ℃ to 780 ℃, the corrosion resistance of the steel under inoculated conditions increased first and then decreased, achieving the best performance after 620 ℃ aging treatment. The heat-treated samples exhibited more uniform microstructure with fewer defects and more precipitated Cu-rich phase, which helped to improve the resistance of 17–4PH stainless steel to MIC.
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