Electrochemical behavior of the simulated heat-affected zone of A516 carbon steel in H2S solution

Her Hsiung Huang, Wen Ta Tsai, Ju Tung Lee

研究成果: Article同行評審

55 引文 斯高帕斯(Scopus)

摘要

Electrochemical behavior of the simulated grain-coarsened heat-affected zone (HAZ) of A516 carbon steel in an H2S containing acidic chloride solution was investigated by electrochemical impedance spectroscopy (EIS) measurement at open circuit potential at 25°C. EIS measurement was made for the specimens, prepared with three different heat input conditions (15, 30 and 45 k J·cm-1) by thermal simulation with a Gleeble machine, in the H2S containing solution. The results show that the corrosion process of the simulated grain-coarsened HAZ can be divided into two stages regardless of the heat input condition. At an early stage, the impedance which is characterized by one large semicircle in the Nyquist plot increases with immersion time. At a later stage, the precipitation of sulfide film modifies the surface properties and leads to a variation in the EIS data by revealing a capacitive effect in the low frequency region. The polarization resistance initially increases with immersion time but then decreases gradually. Equivalent circuits containing two or three time constants are proposed to represent the corrosion processes at different stages.

原文English
頁(從 - 到)1191-1199
頁數9
期刊Electrochimica Acta
41
發行號7-8
DOIs
出版狀態Published - 1996 一月 1

All Science Journal Classification (ASJC) codes

  • 化學工程 (全部)
  • 電化學

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