Influence of Direct Current Electric Field on the

Authors: NianWei Dai JunXi Zhang QiMeng Chen Xin Zhang FaHe Cao JianQing Zhang

Publish Date: 2016/03/12

Volume: 29, Issue: 4, Pages: 373-381

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Abstract

Xray diffraction Raman spectroscopy and scanning electron microscopy were employed to investigate the effects of the DC electric field on the composition formation and structure of corrosion products formed on the surface of the steel immersed in NaCl solution The results show that goethite αFeOOH akaganeite βFeOOH lepidocrocite γFeOOH and magnetite Fe3O4 are the major constituents among the corrosion products The arrangement of different levels of the DC electric field intensity gives rise to the following results The little higher DC electric field intensity around 100–200 kV/m promotes the crystallinity and growth of γFeOOH obviously much higher DC electric field intensity greater than 400 kV/m prevents the growth of αFeOOH and facilitates the generation of Fe3O4 Both the promotional growth of γFeOOH and suppression of αFeOOH growth indicated the weakness of the protectiveness of the rust layer Consequently the suppression of the transformation of αFeOOH from γFeOOH favors the yield of the Fe3O4 which works as a large cathode area and would be about to quicken the subsequent steel corrosionThe work was financially supported by the National Natural Science Foundation of China No 51271110 This work was also supported by Science and Technology Commission of Shanghai Municipality No 14DZ2261000 Authors are grateful for Proofreading Service for checking the language and polishing the manuscript

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