This work analyzes the premature corrosion failure of a welded AISI 304 stainless steel (SS) pipe network in well water (WW) for 6 months. Laboratory tests were performed to analyze the corrosion behavior and to identify and distinguish the genera of bacteria. Pipe specimens were analyzed using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, open circuit potential, cyclic potentiodynamic polarization, and electrochemical impedance spectroscopy. Physicochemical properties of WW in the AISI 304 SS pipe presented a positive Langelier saturation index, indicating the formation of corrosion scales. In welded 304 austenitic SS, the chromium depletion both in HAZ and in weld-metal leads to preferential anodic dissolution. The biofilm electrochemical activity produces oxygen concentration cells and the acid metabolic products induce preferential MIC, thus leading to pit formation on the HAZ of the weld. Biodiversity analysis of bacteria by next generation sequencing was carried out in corroded AISI 304 SS pipes and different genera of bacteria were identified.

这项工作分析了AISI 304不锈钢（SS）焊接管网在井水（WW）中过早腐蚀6个月的情况。进行了实验室测试，以分析腐蚀行为并鉴定和区分细菌属。使用X射线衍射，扫描电子显微镜，能量色散X射线光谱，开路电势，循环电势极化和电化学阻抗光谱对管道样品进行分析。AISI 304 SS管中WW的理化特性呈现出正的Langelier饱和指数，表明形成了腐蚀垢。在焊接的304奥氏体不锈钢中，热影响区和焊接金属中的铬耗竭都会导致优先的阳极溶解。生物膜的电化学活性会产生氧浓缩细胞，而酸性代谢产物会诱导优先的MIC，从而导致在焊缝的热影响区形成凹坑。在腐蚀的AISI 304 SS管中进行了下一代测序法对细菌的生物多样性分析，并鉴定了不同属的细菌。