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Microbially influenced corrosion (MIC) of stainless steel welds has occurred in natural sea water or fresh water. SUS304AB containing Ag has an antibacterial ability. The antibacterial ability of SUS304AB against Bacillus megaterium and Pseudomonas putida was investigated using the film adhering cell suspension method, and also the effect of weld scale on the MIC resistance was investigated by means of corrosion tests for 140 days. The results were as follows;(1) SUS304AB has an antibacterial ability against Pseudomonas putida, but not to Bacillus megaterium.(2) Bacterial adhesion on SUS304AB welds has been reduced to 1/10 that on SUS304 welds, however corrosion pits were observed by SEM.(3) The occurrence of corrosion pits was prevented by means of the weld scale removal by brushing, polishing and pickling, although the bacterial adhesion on SUS304AB welds could not be prevented.

Effect of Weld Scale on Microbially Influenced Corrosion Resistance for SUS304AB Containing Ag Welds