Corrosion Inhibition Effect of Cefotaxime Sodium on Mild Steel in Acidic and Neutral Media
Corrosion Inhibition Effect of Cefotaxime Sodium on Mild Steel in Acidic and Neutral Media
复制标题
头孢噻肟钠在酸性和中性介质中对低碳钢的缓蚀作用
DOI：
10.20964/2020.03.73
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发表时间：
2020-03
影响因子：
1.5
通讯作者：
Xu Yuye
中科院分区：
文献类型：
--
作者：
Lin Bilan;Zheng Shiwei;Liu Jiapo;Xu Yuye
研究了过期抗生素头孢噻肟钠在1.0mol/L磷酸溶液和0.6mol/L氯化钠溶液中对低碳钢的缓蚀作用。通过开路电位(OCP)、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜研究了其腐蚀行为。并对其吸附机理进行了探讨。在H3PO4溶液中，CEF分子迅速达到吸附-脱附平衡。CEF是一种混合缓蚀剂。CEF的吸附符合Langmuir等温吸附模型，主要为化学吸附。电化学纤维的最佳浓度范围为0.5mmoL/L和0.8mmoL/L，几何覆盖度约为0.87。形成了连续的薄膜，双层电容降低。在H3PO4溶液中，CEF对低碳钢提供了有效的长期腐蚀保护。然而，CEF在氯化钠溶液中的吸附-脱附平衡比较困难。CEF对阳极腐蚀仅有轻微的抑制作用。CEF的覆盖率仅为0.1。在中性的NaC l溶液中，CEF几乎没有提供腐蚀保护。CEF没有改变低碳钢的腐蚀机理。两种溶液的对比缓蚀效率与不同的腐蚀机理和氯化钠溶液中存在的大量氯离子直接相关。
The expired antibiotic cefotaxime sodium (CEF) was investigated as a corrosion inhibitor for mild steel in 1.0 mol/L H 3 PO 4 and 0.6 mol/L NaCl solutions. Corrosion behavior was studied via the open circuit potential (OCP), potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy. Furthermore, the adsorption mechanism was investigated. In H 3 PO 4 solution, the adsorption-desorption equilibrium of CEF molecule was reached rapidly. CEF acted as a mixed corrosion inhibitor. CEF adsorption obeyed Langmuir isotherm model and could be attributed primarily to chemical adsorption. The optimal concentration of CEF was in the range of 0.5 m mol/L and 0.8 m mol/L and the geometric coverage was about 0.87. A continuous thin film formed and the double-layer capacitance decreased. CEF offered effective long-term corrosion protection for mild steel in H 3 PO 4 solution. However, the CEF adsorption-desorption equilibrium in NaCl solution was difficult. CEF could only slightly inhibit anodic corrosion. The CEF coverage was only 0.1. CEF provided almost no corrosion protection in the neutral NaCl solution. CEF did not change the corrosion mechanism of mild steel. The contrast inhibition efficiency between both solutions is directly related to the different corrosion mechanisms and the large quantity of chloride ions present in NaCl solution.