十二烷基三甲基碘化铵对铝的缓蚀作用

INHIBITION OF DODECYLTRIMETHYL AMMONIUM IODIDE FOR ALUMINUM

１ｍｏｌ·Ｌ－１ＭｇＣｌ２溶液中，在３０～５０℃范围内用微分极化电阻和微分电容测量技术研究添加不同浓度的十二烷基三甲基碘化铵（ＤＴＭＡＩ）对铝阳极过程的缓蚀作用，结果表明，ＤＴＭＡＩ是铝的有效缓蚀剂，缓蚀效率随着浓度和温度的增加而增大；ＤＴＭＡＩ吸附在铝表面上，且吸附服从Ｌａｎｇｍｕｉｒ等温式发现这种吸附的特点是吸附过程的的总熵增加，且总熵随温度升高而增大，温度对缓蚀效率的影响是由于熵效应而不是焓效应，因此．

The inhibition of dodecyltrimethy ammonium iodide(DTMAI) for the corrosion of aluminum has been studied using measuring Icchniques ot' the differential polarization resistance and the differential capacitance in i mol L-1MgCl2 solution at 30-50℃. The results indicated that DTMAI is an effective inhibitor for aluminum in MgCl2 solutioll. and the inhibition efficiency of DTMAI increases with the raising of temperature and the increasing of inhibitor concentration. The results also showed that the adsorption of DTMAI t'rom MgCl2 solution on the aluminum surface obeys Langmuir isotherm. The entropy change of overall adsorption process is positive. and it increases with raising temperature. The effectof temperature on the inhibition efficiency is attributed to an entropy rather than an enthalpy effect.Consequently. the adsorption of DTMAI on the aluminum Surface is believed to be a basic reason oi the cor corrosion inhibition.