Abstract
A premature pitting corrosion in seam-welded 3-inch L235 steel pipe was reported to occur after 8 years in service. This pipe was part of a closed ice water cooling system, where the inlet water temperature was 6 °C and the outlet water temperature was 11 °C. The present work aimed to investigate the causes of this premature pitting corrosion of the pipe through metallographic investigations. This work comprised a visual examination of the internal surfaces of the pipe and microstructural examinations of the corrosion perforation regions (pitting corrosion areas) using optical and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis. The investigations showed that the corrosion pits occurred only in areas with a huge number of specific micro-voids that can be associated with the excessive presence of trapped hydrogen dissolved in the steel, probably during steelmaking operations.
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