ZHU Min, YUAN Yongfeng, YE Huahui, et al. Effect of concentration of NH4Cl solution on corrosion behavior of Incoloy 825 alloy[J]. CIESC Journal, 2016, (S2): 255-261. DOI: 10.11949/j.issn.0438-1157.20160652.
ZHU Min, YUAN Yongfeng, YE Huahui, et al. Effect of concentration of NH4Cl solution on corrosion behavior of Incoloy 825 alloy[J]. CIESC Journal, 2016, (S2): 255-261. DOI: 10.11949/j.issn.0438-1157.20160652.DOI:
The corrosion behavior of Incoloy 825 alloy was investigated in the different concentration of NH4Cl solution by electrochemical impedance spectroscopy(EIS)
polarization curve measurement and immersion corrosion test.The results show that the open circuit potential shifts negatively with the increase of concentration of NH4Cl solution
i.e.
the corrosion tendency increases.The equivalent circuit of RS(Q1R1)(QdlRt)is used to fit the electrochemical impedance spectra.The EIS result reveals that the charge transfer resistance Rt decreases with the increasing of NH4Cl solution concentration
meanwhile the passive current density and corrosion rate of Incoloy 825 alloy increases.The corrosion morphologies of the alloy are mainly localized corrosion
the intensity and size of pits increase with the increase of solution concentration.The results of EDS show that Cl-involves in the electrochemical reaction process.