物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2012年
3期
623-629
,共7页
缓蚀剂%双子表面活性剂%腐蚀%硫化氢%二氧化碳
緩蝕劑%雙子錶麵活性劑%腐蝕%硫化氫%二氧化碳
완식제%쌍자표면활성제%부식%류화경%이양화탄
Corrosion inhibitor%Gemini surfactant%Corrosion%Hydrogen sulfide%Carbon dioxide
合成了一系列含有羟基的双子表面活性剂:1,3-双(十二烷基二甲基氯化铵)-2-丙醇(12-3OH-12),1,3-双(十四烷基二甲基氯化铵)-2-丙醇(14-3OH-14),1,3-双(十六烷基二甲基氯化铵)-2-丙醇(16-3OH-16)和1,3-双(十八烷基二甲基氯化铵)-2-丙醇(18-3OH-18).采用静态失重法、极化曲线和交流阻抗技术研究了其在H2S/CO2腐蚀环境中对L360钢的缓蚀作用.结果表明,三种研究方法取得的结论是一致的,缓蚀效果为14-3OH-14＞12-3OH-12＞16-3OH-16＞18-3OH-18.其中,12-3OH-12和14-3OH-14都表现出很好的缓蚀效果,在35 mg·L-1的较低浓度下缓蚀率就达95％以上.极化曲线测试结果表明n-3OH-n (n=12,14,16,18)型双子表面活性剂是一种以阳极抑制为主的混合型缓蚀剂.除n=18外,其它三种双子表面活性剂n-3OH-n (n=12,14,16)在L360钢表面的吸附服从朗缪尔等温线,并且属于物理和化学混合吸附.提出了一个用来解释双子表面活性剂在H2S/CO2溶液中缓蚀机理的吸附模型.
閤成瞭一繫列含有羥基的雙子錶麵活性劑:1,3-雙(十二烷基二甲基氯化銨)-2-丙醇(12-3OH-12),1,3-雙(十四烷基二甲基氯化銨)-2-丙醇(14-3OH-14),1,3-雙(十六烷基二甲基氯化銨)-2-丙醇(16-3OH-16)和1,3-雙(十八烷基二甲基氯化銨)-2-丙醇(18-3OH-18).採用靜態失重法、極化麯線和交流阻抗技術研究瞭其在H2S/CO2腐蝕環境中對L360鋼的緩蝕作用.結果錶明,三種研究方法取得的結論是一緻的,緩蝕效果為14-3OH-14＞12-3OH-12＞16-3OH-16＞18-3OH-18.其中,12-3OH-12和14-3OH-14都錶現齣很好的緩蝕效果,在35 mg·L-1的較低濃度下緩蝕率就達95％以上.極化麯線測試結果錶明n-3OH-n (n=12,14,16,18)型雙子錶麵活性劑是一種以暘極抑製為主的混閤型緩蝕劑.除n=18外,其它三種雙子錶麵活性劑n-3OH-n (n=12,14,16)在L360鋼錶麵的吸附服從朗繆爾等溫線,併且屬于物理和化學混閤吸附.提齣瞭一箇用來解釋雙子錶麵活性劑在H2S/CO2溶液中緩蝕機理的吸附模型.
합성료일계렬함유간기적쌍자표면활성제:1,3-쌍(십이완기이갑기록화안)-2-병순(12-3OH-12),1,3-쌍(십사완기이갑기록화안)-2-병순(14-3OH-14),1,3-쌍(십륙완기이갑기록화안)-2-병순(16-3OH-16)화1,3-쌍(십팔완기이갑기록화안)-2-병순(18-3OH-18).채용정태실중법、겁화곡선화교류조항기술연구료기재H2S/CO2부식배경중대L360강적완식작용.결과표명,삼충연구방법취득적결론시일치적,완식효과위14-3OH-14＞12-3OH-12＞16-3OH-16＞18-3OH-18.기중,12-3OH-12화14-3OH-14도표현출흔호적완식효과,재35 mg·L-1적교저농도하완식솔취체95％이상.겁화곡선측시결과표명n-3OH-n (n=12,14,16,18)형쌍자표면활성제시일충이양겁억제위주적혼합형완식제.제n=18외,기타삼충쌍자표면활성제n-3OH-n (n=12,14,16)재L360강표면적흡부복종랑무이등온선,병차속우물리화화학혼합흡부.제출료일개용래해석쌍자표면활성제재H2S/CO2용액중완식궤리적흡부모형.
A series of novel gemini surfactants containing hydroxyl group have been synthesized including 1,3-bis(dodecyl dimethyl ammonium chloride)-2-propanol,1,3-bis(myristyl dimethyl ammonium chloride)-2-propanol,1,3-bis(hexadecyl dimethyl ammonium chloride)-2-propanol,and 1,3-bis(octadecyl dimethyl ammonium chloride)-2-propanol,designated as n-3OH-n (n=12,14,16,18,respectively).The corrosion inhibition for carbon steel in brine solution containing H2S and CO2 was investigated using weight loss method,potentiodynamic polarization,and electrochemical impedance spectroscopy (EIS).The results showed that the inhibition efficiencies (IEs) obtained from all of the methods employed demonstrated a clear trend,with the IEs of the gemini surfactants ranked as 14-3OH-14＞12-3OH-12＞16-3OH-16＞18-3OH-18.Among them,14-3OH-14 and 12-3OH-12 acted as excellent corrosion inhibitors with IE values greater than 95％ at an additive concentration of 35 mg· L-1.Potentiodynamic polarization curves clearly revealed that the gemini surfactants are mixed-type inhibitors which preferentially inhibit the anodic corrosion process.Adsorption of the synthesized gemini surfactants n-3OH-n (n=12,14,16) onto a carbon steel surface obeys the Langmuir adsorption isotherm and they exhibit a mixed physical and chemical adsorption.An adsorption model was proposed to elucidate the inhibition mechanism of gemini surfactants.
