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Abstract：
The purpose of this study is to evaluate the corrosion resistance in natural seawater (Năvodari area) of two types of low-alloy carbon steels BVDH36 and LRAH36 by electrochemical methods. The electrochemical methods used were the evolution of the free potential (OCP), electrochemical impedance spectroscopy (EIS), polarization resistance (Rp) and corrosion rate (Vcorr), potentiodynamic polarization (PD), and cyclic voltammetry (CV). The studies were completed by ex situ characterization analyzes of the studied surfaces before and after corrosion such as: optical microscopy, scanning electron microscopy and X-ray diffraction analysis. The results of the study show us that the polarization resistance of the low-alloy carbon steel BVDH36 is higher compared to the polarization resistance of the low-alloy carbon steel LRAH36. It is also observed that with the increase in the immersion time of the samples in natural seawater, the polarization resistance of the BVDH36 alloy increases over time and finally decreases, and for the carbon steel LRAH36 the polarization resistance increases.
摘要：
这项研究的目的是通过电化学方法评估两种类型的低合金碳钢BVDH36和LRAH36在天然海水（Nāvodari地区）中的耐腐蚀性。使用的电化学方法是自由电位(OCP)的演变，电化学阻抗谱（EIS），极化电阻(Rp)和腐蚀速率(Vcorr)，动电位极化(PD),和循环伏安法(CV)。这些研究是通过对腐蚀前后的研究表面进行非原位表征分析完成的，例如：光学显微镜，扫描电子显微镜和X射线衍射分析。研究结果表明，与低合金碳钢LRAH36的极化电阻相比，低合金碳钢BVDH36的极化电阻更高。还观察到，随着样品在天然海水中浸泡时间的增加，BVDH36合金的极化电阻随时间增加，最后降低，并且对于碳钢LRAH36,极化电阻增加。
