将40%乙醇水溶液作为浸提溶剂,从薇甘菊粉末中提取制备薇甘菊提取物(MME),采用红外光谱(FTIR)对MME的官能团进行分析。采用失重法、电化学分析法、扫描电子显微镜(SEM)以及原子力显微镜(AFM)等研究了MME对冷轧钢在氨基磺酸(NH₂SO₃H)溶液中的缓蚀效果。结果表明:MME对冷轧钢在NH₂SO₃H溶液中产生了显著的缓蚀效果;在30 ℃时,由失重法测得100 mg/L MME对冷轧钢在0.1 mol/L NH₂SO₃H溶液中的缓蚀率达到92.2%;MME在冷轧钢表面的吸附规律服从表观Langmuir吸附等温式,其在钢表面的标准吸附吉布斯自由能约为-30 kJ/mol,即同时存在物理吸附和化学吸附;MME为混合抑制型缓蚀剂,添加MME以后,试样表面平整均匀,腐蚀程度显著降低,有效减缓了酸性介质对钢表面的腐蚀。

The extract of mikania micrantha kunth (MME) was extracted from mikania micrantha powder with 40% ethanol aqueous solution as the extraction solvent. The functional groups of MME were analyzed by FTIR. The corrosion inhibition effect of MME on cold rolled steel in NH₂SO₃H solution was studied by weight-loss method, electrochemical analysis, scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results showed that the corrosion inhibition effect of MME on cold rolled steel in NH₂SO₃H solution was remarkable. At 30 ℃, the corrosion inhibition rate of 100 mg/L MME to cold rolled steel in 0.1 mol/L NH₂SO₃H solution measured by weight loss method reached 92.2%. The adsorption law of MME on the surface of cold rolled steel obeyed the apparent Langmuir adsorption isotherm, and its standard adsorption Gibbs free energy on the steel surface was about -30 kJ/mol, there were physical adsorption and chemical adsorption at the same time. MME was a mixed inhibition corrosion inhibitor. After adding MME, the surface of the sample was smooth and uniform, and the corrosion degree was significantly reduced, which effectively slowed down the corrosion of acidic medium on the steel surface.