The Electrochemical Corrosion Behaviors of X70 Pipeline Steel in Polluted Freshwater

Gang Cao; Dong Sheng Xia; Lei Sun

doi:10.4028/www.scientific.net/AMR.955-959.431

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The Electrochemical Corrosion Behaviors of X70 Pipeline Steel in Polluted Freshwater

Abstract:

The corrosion behaviors of X70 pipeline steels in polluted freshwater were investigated by electrochemical measurements. Results of immersion experiments in eutrophic freshwater and pollution-free water showed that the dissolved oxygen content in the water was a key factor in determining the corrosion rate of X70 pipeline steels. Because the dissolved oxygen content in the polluted freshwater was lower than that in pollution-free freshwater, the corrosion rate of X70 pipeline steels in polluted freshwater was also lower than that in the pollution-free water. Moreover, electrochemical measurements in simulated freshwater showed that phosphoric compounds had an inhibiting influence on the corrosion of X70 pipeline steels while the nitric compounds had little this inhibiting effect.