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Journal of Electrochemistry ›› 2020, Vol. 26 ›› Issue (6): 808-814.  doi: 10.13208/j.electrochem.190418

Special Issue: “腐蚀”专题文章

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Pitting Behaviors of Passivated and Trans-Passivated 304 Stainless Steel

SHEN Jing1, WANG Zi-ming1, ZHENG Da-jiang1, SONG Guang-ling1,2,3,*()   

  1. 1. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University, Xiamen 361005, Fujian, China
    2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2019-04-18 Revised:2019-06-10 Online:2020-12-28 Published:2019-05-29
  • Contact: SONG Guang-ling E-mail:guangling.song@hotmail.com


In order to further understand the passivation and trans-passivation behaviors of 304 stainless steels, the samples were pretreated under different polarization potentials and their corrosion behaviors were investigated. It was found that the pitting potential of the untreated sample was the same as that of the sample treated with 1.1 V trans-passivation potential, while the pitting potential of the sample treated with 0.5 V passivation treatment was the highest. This observation was further verified by the SKP results. According to SEM observations, the surface of the untreated sample preserved a polishing morphology, while the surface of the 0.5 V passivation treated sample was covered by a passivation film decorated with small corrosion particles, performing good corrosion resistance. However, cracks appeared on the surface of the 1.1 V trans-passivation treated sample, leading to severe localized corrosion of the matrix and resulting in the deterioration of the trans-passivation film.

Key words: passivation, trans-passivation, pitting, stainless steel

CLC Number: