Microbiologically influenced corrosion (MIC) of S32654 (654SMO) super austenitic stainless steel (SASS) by acid producing bacterium (APB), Acidithiobacillus caldus SM-1, a strain of sulfur-oxidizing bacteria (SOB) used in biohydrometallurgy field, was investigated using electrochemical measurements and surface characterizations during a 14-day immersion test. The results indicated that S32654 SASS was susceptible to MIC by APB, and A. caldus SM-1 was capable of producing an aggressive acidic environment underneath the biofilm, resulting in the dissolution of the passive film and severe pitting attacks against S32654 SASS, which is commonly regarded as a corrosion resistant material.

微生物腐蚀S32654的（MIC）（654SMO）超奥氏体不锈钢（SASS）由酸产生菌（APB），嗜酸喜温SM-1，在生物湿法冶金领域中使用的硫氧化细菌的菌株（SOB），用调查在14天的浸没测试中进行电化学测量和表面表征。结果表明S32654 SASS易受APB的MIC侵害，而A. caldus SM-1能够在生物膜下产生侵蚀性酸性环境，从而导致钝化膜的溶解和对S32654 SASS的严重点蚀。通常被认为是一种耐腐蚀材料。