將40%乙醇水溶液作為浸提溶劑,從薇甘菊粉末中提取制備薇甘菊提取物(MME),采用紅外光譜(FTIR)對MME的官能團進行分析。采用失重法、電化學分析法、掃描電子顯微鏡(SEM)以及原子力顯微鏡(AFM)等研究了MME對冷軋鋼在氨基磺酸(NH₂SO₃H)溶液中的緩蝕效果。結果表明:MME對冷軋鋼在NH₂SO₃H溶液中產生了顯著的緩蝕效果;在30 ℃時,由失重法測得100 mg/L MME對冷軋鋼在0.1 mol/L NH₂SO₃H溶液中的緩蝕率達到92.2%;MME在冷軋鋼表面的吸附規律服從表觀Langmuir吸附等溫式,其在鋼表面的標準吸附吉布斯自由能約為-30 kJ/mol,即同時存在物理吸附和化學吸附;MME為混合抑制型緩蝕劑,添加MME以后,試樣表面平整均勻,腐蝕程度顯著降低,有效減緩了酸性介質對鋼表面的腐蝕。

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.