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Corrosion and corrosion inhibition by thiourea of bulk nanocrystallized industrial pure iron in dilute HCl solution |
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| Authors: | C.B. Shen S.G. Wang K. Long |
| Affiliation: | a State Key Laboratory for Corrosion and Protection of Metal, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China b Shenyang National Laboratory for Materials Sciences and International Centre for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China c Department of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China |
| Abstract: | The corrosion behaviors of bulk nanocrystallized and coarse grain industrial pure iron (BNIPI & CGIPI) were investigated in 1 mol L−1 HCl at room temperature by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve. Meanwhile, the inhibitive effect of thiourea (TU) on the corrosion behaviors were tested. Results indicate that BNIPI is less prone to occur corrosion than its coarse grain counterpart in blank 1 mol L−1 HCl at room temperature. When CGIPI was immersed for a very short time, namely, 5 min, an inductive loop appears at different concentrations at the Nyquist plots, but it doesn’t appear at those of BNIPI at the same period. A critical concentration of thiourea with the largest Rct in the complex impedance plane appears for both samples. |
| Keywords: | Bulk nanocrystallized industrial pure iron (BNIPI) Thiourea Inhibition Hydrochloridic solution |
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