利用恒电量法快速测量了Q235钢在0.5mol/L硫酸溶液及其硫脲缓蚀溶液中的腐蚀，建立新的解析方法获得Tafel常数，探讨了恒电量激励条件下的等效电路，同时用电化学阻抗谱进行验证。结果表明：恒电量法不仅能快速测量Rp和Cd值，而且可以及时获得添加缓蚀剂前后的B值，对于表面状态变化快的酸性缓蚀体系，能更加直接、准确地评价缓蚀剂，对恒电量测量，可以避免缓蚀剂吸脱附等慢过程的影响，用简单模型获得的Rt值的大小，将大大地简化了酸性缓蚀剂的评价。
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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