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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 corrosion inhibition behavior of cetylallyl dimethylammonium bromide (CDAB) on Q235 steel in sulfuric acid medium was studied by static weight loss method, potentiodynamic polarization curve and electrochemical impedance spectroscopy. Corrosion inhibition mechanism of Q235 steel. The results showed that the corrosion inhibition rate increased with the increase of CDAB concentration at 25 ℃. When the concentration of CDAB was only 10 mg · L-1, the corrosion inhibition rate was about 85%. The experimental results of polarization curves show that CDAB is a mixed type corrosion inhibitor mainly controlled by anode reaction, and the static weight loss method, potentiodynamic polarization curve method and electrochemical impedance method are consistent. The adsorption of CDAB on Q235 steel obeys the isothermal model of Kastening-Holleck adsorption. The addition of CDAB significantly increases the activation energy of corrosion reaction and effectively inhibits the corrosion reaction.