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Four tanks made from type 304L stainless steel were removed from storage. Atmospheric corrosion on the outside of the tanks and pitting and crevice corrosion on the inside were visible. Metallographic examination revealed that the internal corrosion had been caused by crevices related to weld spatter and uneven weld deposit and by service water that had not been drained after hydrostatic testing. External corrosion was attributed to improper passivation. It was recommended that the surfaces be properly passivated and that, before storage, the interiors be rinsed with demineralized water and dried.

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