Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (1): 38-42.DOI: 10.12068/j.issn.1005-3026.2015.01.009

• Materials & Metallurgy • Previous Articles     Next Articles

Corrosion Process of Ferritic Stainless Steel in Hydrochloric Acid Solution

XIE Qiong, SHI Pei-yang, JIANG Mao-fa   

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores,Ministry of Education, Northeastern University, Shenyang 110819, China.
  • Received:2013-12-02 Revised:2013-12-02 Online:2015-01-15 Published:2014-11-07
  • Contact: XIE Qiong
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Abstract: The corrosion process of ferritic stainless steel in hydrochloric acid solution was researched by electrochemical workstation and microstructure analysis. The results showed that the corrosion process of ferritic stainless steel in hydrochloric acid solution includes three periods: penetrating of ions into the passive film, thickening of corrosion production film and equilibrium of polarizing reactions. Uniform corrosion is the only way found in the periods of penetrating the passive film and thickening of corrosion production film, while abundant intercrystalline corrosion and a few pitting corrosions appear in the period of equilibrium of polarizing reactions. When the hydrochloric acid is above 10%, the corrosion process is completely controlled by the anodic reactions and the passive zone totally disappeared. Both the solution resistance Rs and the charge-transfer resistance Rt decrease with the increase of the concentration of hydrochloric acid, meanwhile the capacities of charging and discharging of the electric double layer in the surface of the stainless steel anode do not change obviously.

Key words: ferritic stainless steel, hydrochloric acid pickling, electrochemical corrosion, polarization curve, EIS(electrochemical impedence spectroscopy)

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