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| Rapid Evaluating Method of The Corrosion Inhibitors In Acidic Solution Based On The Coulostatic Technique |
| ZHAO Yongtao;GUO Xingpeng;DONG Zehua |
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Abstract In this paper, the corrosion rate of mild steel in 0.5mol/L sulphuric acid with and without thiourea were evaluated by the Coulostatic technique, and a novel approach based on NLLS (Non-linear least square) fitting method was persented to get Tafel constant. Different kind of equivalent circuit model such as R(CR(RL)) and R(RC) was discussed, and used to analyze the response to the Coulostatic perturbation. In addition, Electrochemical impedance spectroscopy (EIS) was used to confirm the results from the coulostatic method. The results shows that the Coulostatic technique is not only determined the values of Rp, Cd quickly, but also the Tafel coefficient timely both in the acid solution with and without inhibitor, Therefore the Coulostatic method is useful for a direct and rapid evaluation for corrosion inhibitors, especially for the changeful surface of metal in the acid solutions. Moreover, since the Coulostatic measurement is a very rapid process, so that it is highly convenient to get Rt by analyzing of the R(RC) circuit model, and that indicated that the evaluation process might be made much more simplified.
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Received: 05 November 2003
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Corresponding Authors:
Zhaoyongtao
E-mail: ytzhao7302@sina.com
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