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Effect of dynamic DC stray current on corrosion behavior of X70 steel
Author(s) -
Qin Huimin,
Du Yanxia,
Lu Minxu,
Meng Qingsi
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911022
Subject(s) - corrosion , stray voltage , materials science , current (fluid) , direct current , metallurgy , immersion (mathematics) , electrochemistry , composite material , electrode , chemistry , thermodynamics , electrical engineering , engineering , voltage , physics , mathematics , pure mathematics
Corrosion behavior of X70 steel under the application of dynamic DC stray current was investigated in simulated soil solution by immersion tests and electrochemical measurements. Experimental results indicated that the corrosion rate of X70 steel under dynamic DC stray current was strongly influenced by the dynamic period. When the dynamic period was <80 s, the corrosion rate was only approximately 1–7% of that caused by an equivalent amount of steady direct current. However, as the dynamic period became >80 s, the corrosion rate increased significantly with the dynamic period. And finally when the dynamic period was >1 hr, the corrosion rate was nearly equal to 100% of that caused by an equivalent amount of steady direct current. Meanwhile, the surface examination showed that the specimens experienced uniform corrosion under the experimental conditions. On the basis of the experiment results, the dynamic DC stray current corrosion mechanism of X70 steel under the experimental conditions was discussed, which was closely related to the electric double‐layer structure at the electrode/solution interface and dynamic electrochemical reactions under dynamic stray current.