The corrosion behavior of pipeline steel under DC current interference under cathodic protection was studied by means of electrochemical experiment. The results show that the cathodic protection polarization potential shifts forward and increases linearly with the increase of current density when the X65 pipeline steel is subjected to DC interference. When the DC current density is 10A/m², the cathodic protection system has failed. By gradually reducing the negative protection potential, the polarization potential of X65 test piece is shifted negatively. After providing negative protection potential of -1V, the polarization potential of X65 specimen reaches about -0.8V, which can provide good cathodic protection effect. With the continuous negative adjustment of the cathodic protection potential, the corrosion rate gradually increases, so the cathodic protection potential can give a better corrosion protection effect when it is about -1V.
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Li et al. (2024) studied this question.
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