十六烷基二甲基乙基溴化铵在硫酸介质中对Q235钢的缓蚀性能研究

Corrosion Inhibition of Cetyldimethylethylammonium Bromide for Q235 Steel in Sulphuric Acid Solution

采用静态失重法、动电位极化曲线法和电化学阻抗法研究了十六烷基二甲基乙基溴化铵(CDAB)在硫酸介质中对Q235钢的缓蚀行为,并探讨了其对Q235钢的缓蚀作用机理。结果表明,在25℃下,缓蚀率随CDAB浓度增大而增大,在浓度仅为10 mg·L-1时,失重缓蚀率达85%左右。极化曲线实验结果显示,CDAB是一种以控制阳极反应为主的混合型缓蚀剂,且静态失重法、动电位极化曲线法和电化学阻抗法实验结果相一致。CDAB在Q235钢表面的吸附服从Kastening-Holleck吸附等温模型;CDAB的添加显著增大了腐蚀反应的活化能,有效抑制了腐蚀反应的进行。

The inhibition performance of cetyldimethylethylammonium bromide（CDAB） for Q235 steel in sulphuric acid solution at 25 ℃ was evaluated by static weight loss methods, potentiodynamic polarization curve and electrical impedance spectroscopy（EIS）. The results revealed that the inhibition efficiency was found to increase with the increase of CDAB concentration; the inhibition efficiency was up to 85.07% when the concentration of CDAB was only 10 mg·L-1; the CDAB was a mix-type inhibitor which mainly inhibited anodic process, moreover, the corrosion inhibition performances evaluated respectively by the static weight loss method, the potentiodynamic polarization curve and EIS were almost consistent. The adsorption of CDAB on Q235 steel surface followed the Kastening- Holleck＇s adsorption isotherm. The activation energy of corrosion reaction was significantly increased by the addion of CDAB, which indicated that the process of corrosion reaction was effectively inhibited.