In the harsh marine environment, various metallic materials in service are subjected to varying degrees of corrosion damage, significantly impacting marine ecosystems and economic efficiency. While the mechanisms of microbial corrosion in shallow marine environments have become a focal point of international research, with substantial progress made in theoretical frameworks and experimental data accumulation, the understanding of microbial corrosion mechanisms under the unique conditions of deep-sea environments remains limited. This study focuses on the effect of deep-sea piezotolerant bacteria on the corrosion of 2205 duplex stainless steel in M. piezotolerans bacteria containing media at 28 ^oC, namely the optimal growth temperature of that bacteria, aiming to provide theoretical support for microbial corrosion research on metallic materials in deep-sea environments. The M. piezotolerans bacteria used in this study, was isolated and purified from sampling sediments from the South Pacific Gyre. Characterization techniques such as confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM), X-ray photoelectron currents. The uniform corrosion rate was reduced; however, small pitting corrosion sites were observed on the spectroscopy (XPS), and electrochemical impedance spectroscopy (EIS) were employed to examine the corrosion behavior of 2205 duplex stainless steel in the presence of M. piezotolerans. The results demonstrated that the presence of M. piezotolerans may facilitate the formation of a three-dimensional structured corrosion products film on the steel surface. Compared to sterile solutions, steels in M. piezotolerans culture exhibited lower impedance values and higher corrosion rate. Overall, the biofilm formed in the presence of M. piezotolerans on 2205 duplex stainless steel could partially inhibit the uniform corrosion of the steel but exacerbated localized corrosion, resulting in the formation of distinct pitting sites on the steel surface.