Effect of resistivity on the corrosion mechanism of mild steel in sodium sulfate solutions
Effect of resistivity on the corrosion mechanism of mild steel in sodium sulfate solutions
复制标题
DOI：
10.1023/b:jach.0000003855.95788.12
复制
发表时间：
2003-12-01
影响因子：
2.9
通讯作者：
Genesca, J
中科院分区：
文献类型：
--
作者：
Arzola, S;Palomar-Pardavé, ME;Genesca, J
采用电化学阻抗谱(EIS)研究了低碳钢样品在室温下浸入1%、0.1%、0.01%和0.001%Na(2)SO(4)水溶液中的腐蚀行为，分析腐蚀机理并获得不同电阻率环境下腐蚀速率的代表值。 EIS技术用于测量1%至0.01%Na(2)SO(4)溶液中的腐蚀电流密度，对应于0.001%浓度的测量给出了分散的奈奎斯特图，而在伯德表示中获得了与溶液电阻相关的响应。为了比较 EIS 获得的结果，还使用了其他电化学技术，如线性极化电阻、LPR、Tafel 外推法和电化学噪声 (EN)。 EIS 技术中获得的“电荷转移电阻”(R(ct)) 参数与 LPR 技术中获得的“极化电阻”(R(p)) 值的相应值非常一致，而 EN 技术中获得的“电化学噪声电阻”(R(n)) 参数给出了所有浓度的最高值。这些参数通常随着溶液浓度的降低而增加。
Electrochemical impedance spectroscopy (EIS) was used to study the corrosion behavior of mild steel samples immersed in 1, 0.1, 0.01 and 0.001% Na(2)SO(4) aqueous solutions at room temperature in order to analyze the corrosion mechanism and obtain representative values of corrosion rates in environments with different resistivity. The EIS technique was used to measure corrosion current densities in 1 to 0.01% Na(2)SO(4) solutions, and the measurement corresponding to 0.001% concentration gave a scattered Nyquist plot, whereas in the Bode representation a response associated with solution resistance was obtained. Other electrochemical techniques such as linear polarization resistance, LPR, Tafel extrapolation method and electrochemical noise (EN) were used in order to compare the results obtained by EIS. The 'charge-transfer resistance' (R(ct)) parameters obtained in the EIS technique agree well with the corresponding values of 'polarization resistance' (R(p)) values obtained by the LPR technique, whereas the 'electrochemical noise resistance' (R(n)) parameters obtained by the EN technique gave the highest values for all concentrations. These parameters generally tended to increase as the concentration of the solution decreased.