Amphoteric surfactant of octadecyl dimethyl betaine as an efficient corrosion inhibitor for cold rolled steel in phosphoric acid solution
Amphoteric surfactant of octadecyl dimethyl betaine as an efficient corrosion inhibitor for cold rolled steel in phosphoric acid solution
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十八烷基二甲基甜菜碱两性表面活性剂作为冷轧钢在磷酸溶液中的高效缓蚀剂
DOI：
10.1016/j.jmrt.2021.11.107
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Guanben Du
中科院分区：
文献类型：
--
作者：
Fu Zhang;Xianghong Li;Shuduan Deng;Min Tang;Guanben Du
采用失重、电化学、表面分析和量子化学计算等方法，研究了十八烷基二甲基甜菜碱(BS-18)两性表面活性剂在磷酸溶液中对冷轧钢板(CRS)的缓蚀作用。结果表明，BS-18在20℃~50℃的1.0MH3PO4介质中对铬的缓蚀效果较好，在20℃时加入50 mg的L−-1缓蚀率最高可达87.1%。BS-18在钢表面的吸附符合朗缪尔吸附等温式，是伴随着熵增加的吸热过程。加入BS-18后，抑制溶液的表观活化能、指前因子、活化能和活化熵均高于未抑制溶液，而反应常数和速率常数均有所降低。缓蚀性能在3~48h内保持较稳定，在酸浓度0.5~5.0范围内略有波动。BS-18是一种混合型缓蚀剂，具有“几何封闭效应”。EIS是一个时间常数，在Nyquist图中有一个抑制的电容回路，在Bode相图中有一个相角，并且BS-18的存在使电荷转移电阻变得更大。用扫描电子显微镜和原子力显微镜观察了缓蚀剂CrS表面的腐蚀情况，发现缓蚀剂的接触角增大。XPS分析表明，BS-18在CRS表面的吸附膜中含有C-N和C-N+官能团。表面张力测定结果表明，BS-18的临界胶束浓度约为20 mg/−。量子化学计算证实，BS-18的活性吸附中心是N+和-CH2COO−的亲水基团。
The inhibition effect of amphoteric surfactant of octadecyl dimethyl betaine (BS-18) on cold rolled steel (CRS) in H3PO4solution was studied by weight loss, electrochemical technique, surface analysis and quantum chemical calculations. The results show that BS-18 acts as an efficient inhibitor on CRS in 1.0 M H3PO4medium at 20–50 °C, and the maximum inhibition efficiency is 87.1% with 50 mg L−1at 20 °C. Its adsorption on steel surface obeys Langmuir adsorption isotherm, which is endothermic process accompanying with the increase of entropy. Compared with uninhibited solution, apparent activation energy, pre-exponential factor, activation enthalpy and activation entropy become higher in inhibited solution, while both reaction constant and rate constant decrease after adding BS-18. Inhibition performance remains more stable from 3 to 48 h, and fluctuates slightly with the acid concentration from 0.5 to 5.0 M. BS-18 is a mixed-type inhibitor through “geometric blocking effect”. EIS is a time constant with one depressed capacitive loop in Nyquist plot and one phase angle in Bode phase plot, and the charge transfer resistance turns to become more larger in the presence of BS-18. SEM and AFM micrographs of inhibited CRS surface appear little corrosion, and its contact angle is increased. There are functional groups of C–N and C–N+in the adsorptive film of BS-18 on CRS surface using XPS analysis. Critical micelle concentration (CMC) of BS-18 is about 20 mg L−1from surface tension measurements. Quantum chemical calculations confirm that the active adsorption site of BS-18 is the hydrophilic group of N+and –CH2COO−.
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影响因子：
1.6
作者：
Zhou,Xiao-ze;Liu, Dan;Xu, Bao-cai;Zhou, Ya-wen
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DOI：
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DOI：
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发表时间：
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影响因子：
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作者：
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