白酒糟提取物对Q235钢在盐酸介质中的缓蚀作用和吸附行为

摘要

The corrosion inhibition and adsorption behavior of the extractive from distiller＇s grains for Q235 steel in hydrochloric acid medium was studied by weight loss and electrochemical methods. The results of weight loss showed that the inhibition efficiency was up to 94. 41% when the inhibitor concentration was 24 g/L in 1 mol/L HCl solution at 25 ℃. The results of polarization curves showed that the extractive from distiller＇s grains was a mixed-type inhibitor in hydrochloric acid medium. The fitting results showed that the adsorption met the E1-Awady thermodynamic kinetic model and was inline with the Flory-Huggins isotherm.%采用失重法和电化学法研究了白酒糟提取物作为酸洗缓蚀剂对Q235钢在盐酸介质中的缓蚀作用和吸附行为。失重法研究表明，白酒糟提取物在盐酸介质中能有效抑制Q235钢的腐蚀，25℃，1mol／L的HCl中，白酒糟提取物浓度为24g／L时，缓蚀率达到94．41％；电化学研究结果表明，白酒糟提取物在1mol／I，HCI中属抑制阳极反应为主的混合型缓蚀剂；另外，利用失重试验数据进行吸附规律拟合结果表明，白酒糟提取物在Q235钢表面吸附符合E1-Awady动力学模型与Flory-Huggins等温线方程，其吸附为几何覆盖