Abstract

This study systematically investigated the corrosion behavior of the oxide scale on low carbon steel cooling water pipelines. The results showed that the oxide scale mainly consisted of Fe3O4 and dispersed precipitated Fe phase, exhibiting good electrical conductivity. The Volta potential of the internal Fe3O4 within the oxide scale was over 80 mV higher than that of both the precipitated Fe phase and the substrate. During service, complex galvanic corrosion couples were formed, leading to galvanic corrosion. The presence of the oxide scale had a significant negative impact on the corrosion resistance of the low carbon steel water pipes.

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