Abstract
The mechanism of grooving corrosion in electric resistance welded (ERW) carbon steel pipe in sea water was investigated. Grooving corrosion is a selective localized corrosion of the weld. Scanning electron microscopic observation revealed that corrosion pits initiated immediately on the MnS inclusions and developed into grooving corrosion with the aid of the macro-cell formed between the anodic narrow weld and cathodic base metal of the pipe. High localized corrosion susceptibility of MnS inclusions in the weld is due to their surrounding S-enriched portions caused by the rapid heating and cooling in welding.
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