CAJ | 학술논문

采用失重法、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)研究了氯化硝基四氮唑蓝(NTBC) 在1.0-5.0 mol·L-1 HCl 溶液中对冷轧钢(CRS)的缓蚀作用.结果表明:NTBC在1.0 mol·L-1 HCl 溶液中对冷轧钢具有良好的缓蚀作用,且在钢表面的吸附符合Langmuir 吸附等温式.缓蚀率随缓蚀剂浓度的增加而增大,但随盐酸浓度和温度的增加而减小.求出了相应的吸附热力学(吸附自由能ΔG0,吸附焓ΔH0,吸附熵ΔS0)和腐蚀动力学参数(腐蚀速率常数k,动力学常数B),并根据这些参数讨论了缓蚀作用机理.动电位极化曲线表明:NTBC为混合抑制型缓蚀剂; EIS 谱在高频区呈容抗弧,在低频区出现感抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大.SEM再次表明NTBC对钢在盐酸介质中的腐蚀产生了明显的抑制作用.
채용실중법、동전위겁화곡선、전화학조항보(EIS)화소묘전자현미경(SEM)연구료록화초기사담서람(NTBC) 재1.0-5.0 mol·L-1 HCl 용액중대랭알강(CRS)적완식작용.결과표명:NTBC재1.0 mol·L-1 HCl 용액중대랭알강구유량호적완식작용,차재강표면적흡부부합Langmuir 흡부등온식.완식솔수완식제농도적증가이증대,단수염산농도화온도적증가이감소.구출료상응적흡부열역학(흡부자유능ΔG0,흡부함ΔH0,흡부적ΔS0)화부식동역학삼수(부식속솔상수k,동역학상수B),병근거저사삼수토론료완식작용궤리.동전위겁화곡선표명:NTBC위혼합억제형완식제; EIS 보재고빈구정용항호,재저빈구출현감항호,전하전이전조수완식제농도적증가이증대.SEM재차표명NTBC대강재염산개질중적부식산생료명현적억제작용.
The inhibition effect of nitrotetrazolium blue chloride (NTBC) on the corrosion of cold rolled polarization curves, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy adsorption of NTBC on the CRS surface obeys the Langmuir adsorption isotherm. Inhibition efficiency increases with inhibitor concentration while it decreases with hydrochloric acid concentration and temperature. The adsorption thermodynamic parameters (adsorption free energy ΔG0, adsorption enthalpy ΔH0, adsorption entropy ΔS0) and corrosion kinetic parameters (corrosion rate constant k, kinetic reaction constant B) were also calculated. Based on these parameters the inhibitive mechanism is discussed.Potentiodynamic polarization curves show that NTBC acts a mixed-type inhibitor. EIS spectra exhibit one capacitive loop at high frequency and this is followed by a small inductive loop at low frequency, and the charge transfer resistance increases with inhibitor concentrations. SEM clearly shows that the addition of NTBC can drastically retard the corrosion of steel in hydrochloric acid media.