CAJ | 학술논문

利用交流阻、Tafel极化曲线和原子力显微镜(AFM)，研究2-氨基-1,3,4-噻二唑(ATD)、5-甲基-2-氨基-1,3,4-噻二唑(MATD)、5-苯基-2-氨基-1,3,4-噻二唑(PATD)和2,5-二苯基-1,3,4-噻二唑(DPTD)4种具有不同取代基的噻二唑衍生物在50 mg·L-1硫溶液中对金属银的缓蚀性能。实验结果表明：缓蚀剂成功地吸附到了金属表面，金属腐蚀受到明显的抑制，且4种缓蚀剂的缓蚀效率的大小顺序是：MATD>PATD>ATD>DPTD。位于噻二唑环2，5位置上非极性和极性基团结构的变化，极性基团均对缓蚀剂的缓蚀性能有较大影响。因极性基团更容易吸附到金属表面，所以当噻二唑环上存在极性基团时，其抗腐蚀性能明显增强；当环上存在非极性基团时，与芳基相比，非极性基团为烷基时，其缓蚀性能更好，原因可能是由于芳基的体积较大，在吸附过程中受到的阻力较大。通过动力学分析可知：4种缓蚀剂在金属表面的吸附遵循Langmuir吸附等温方程，吸附类型属于化学吸附为主的混合吸附。通过分子动力学模拟，进一步研究了4种缓蚀剂的抗腐蚀机理，结果表明缓蚀剂与金属界面发生吸附时，4种缓蚀剂的噻二唑环和环上亲水支链中的极性基团优先吸附到金属银表面，理论计算和实验结果一致。
이용교류조、Tafel겁화곡선화원자력현미경(AFM)，연구2-안기-1,3,4-새이서(ATD)、5-갑기-2-안기-1,3,4-새이서(MATD)、5-분기-2-안기-1,3,4-새이서(PATD)화2,5-이분기-1,3,4-새이서(DPTD)4충구유불동취대기적새이서연생물재50 mg·L-1류용액중대금속은적완식성능。실험결과표명：완식제성공지흡부도료금속표면，금속부식수도명현적억제，차4충완식제적완식효솔적대소순서시：MATD>PATD>ATD>DPTD。위우새이서배2，5위치상비겁성화겁성기단결구적변화，겁성기단균대완식제적완식성능유교대영향。인겁성기단경용역흡부도금속표면，소이당새이서배상존재겁성기단시，기항부식성능명현증강；당배상존재비겁성기단시，여방기상비，비겁성기단위완기시，기완식성능경호，원인가능시유우방기적체적교대，재흡부과정중수도적조력교대。통과동역학분석가지：4충완식제재금속표면적흡부준순Langmuir흡부등온방정，흡부류형속우화학흡부위주적혼합흡부。통과분자동역학모의，진일보연구료4충완식제적항부식궤리，결과표명완식제여금속계면발생흡부시，4충완식제적새이서배화배상친수지련중적겁성기단우선흡부도금속은표면，이론계산화실험결과일치。
The inhibition performances of thiadiazole derivatives, namely, 2-amino-1,3,4-thiadiazole (ATD), 5-metheyl-2-amino-1,3,4-thiadiazole (MATD), 5-phenyl-2-amino-1,3,4-thiadiazole (PATD), and 2,5-diphenyl- 1,3,4-thiadiazole (DPTD), on silver strip corrosion in 50 mg·L-1 sulfur solution was studied using electrochemical impedance spectroscopy (EIS), Tafel polarization techniques and atom force microscopy (AFM). These measurements showed that the addition inhibited silver strip corrosion, and the inhibitor formed a protected film on the silver strip surface. The inhibition efficiency decreased in the order of MATD > PATD > ATD > DPTD. The substitutes, which occupied 1 or 2 sites on the central five membered ring and had polar groups and non-polar groups properties and some active functional groups showed an important effect on the inhibition performance of thiadiazole derivatives. Compounds showed the best inhibitive efficiency when thiadiazole derivatives had the polar groups and the best inhibitive efficiency when non-polar groups were alkyl groups, because steric exclusion of aromatic groups decreased the adsorption. Kinetics analysis indicated that adsorption of the four inhibitors onto silver surface followed Langmuir adsorption isotherm. The adsorption belonged to mix-type adsorption mainly dominated by chemisorption. The inhibition mechanism of four corrosion inhibitors against sulfur corrosions was theoretically studied using molecular dynamics simulations. The results indicated that the ring thiadiazole and heteroatom of the polar group on the hydrophilic chain were preferentially adsorbed when the inhibitors reacted with metal surface, and the theoretical calculation accorded well with experimental results.