Study on the Corrosion Behavior of X65 Steel Under Cathodic Protection Influenced by Simulated Stray Current Interference
The operation of the subway train system can leak stray currents,causing fluctuations in the potential of nearby buried metal,weakening or even failing the cathodic protection effect,and ultimately leading to the failure of buried metal due to corrosion. In this paper,taking the commonly used pipeline steel X65 steel as the research object,and a stray current corrosion simulation test device was built in the laboratory. Two sets of corrosion simulation tests were conducted to study the corrosion behavior law of X65 steel subjected to cathodic protection under stray current interference,with stray current interference potentials of±1,±2 and±4 V for 4 d,and stray current interference potentials of±2 V for 1,2,4 and 8 d. The research results showed that when the stray current interference potential reached+2 V or more,the corrosion rate of X65 steel increased sharply. The pitting corrosion of X65 steel sample would be changed into uniform corrosion by the forward stray current interference,and the cycle of pitting corrosion would alternate between the two,with the corrosion product composition of Fe2O3 . Nega-tive stray current interference had a corrosive effect on the X65 steel samples,but the effect was relatively minor.
DC stray currentcathodic protectionburied metalcorrosionX65 steel
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