Corrosion inhibition effect of biocides on carbon steel pipelines at different service stages Available to Purchase

This paper aims to clarify the corrosion inhibition effects of biocides NaClO, ClO₂ and C₁₇H₃₀ClN on carbon steel pipelines at different service stages.

The corrosion behavior of new service pipelines and in-service pipelines with corrosion nodulations after biocide application was compared using microbial counting, surface analysis and electrochemical tests.

The results of this study show that for the new service pipelines, the corrosion rate increases in the NaClO and ClO₂ systems and decreases in the C₁₇H₃₀ClN system. Therefore, C₁₇H₃₀ClN exhibits the best corrosion inhibition efficiency for new service pipelines. For the in-service pipelines with corrosion nodulations, ClO₂ and NaClO can accelerate the sample corrosion, while C₁₇H₃₀ClN cannot fully remove the existing corrosion nodulations. So the application of a single biocide is insufficient to reduce the risk of corrosion. The synergistic use of C₁₇H₃₀ClN and ClO₂ is beneficial for removing the existing nodulations, thereby minimizing the risk of local corrosion during long-term service.

This study provides guidance for corrosion control of pipelines at different service stages.