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用经典的恒电势极化曲线方法研究了25℃下,浓度高达12N的盐酸对于45钢的腐蚀以及在8.7N(～28％)HCl中不同浓度六次甲基四胺(U)和2.4.6-三甲基吡啶(TMP)单独或复合加入时的缓蚀作用。发现盐酸浓度在8.7N以上时,阴极极化曲线趋于重合,使腐蚀作用的增加趋势逐渐减缓。在8.7NHCl中U是强烈的阴极缓蚀剂,它的缓蚀作用比TMP高出许多,当两者复合使用时,TMP中杂质较少时只超加和作用,但杂质较多时能产生强烈的协合作用。本文用在Fe/高浓盐酸界面上H~+Cl~-_“分子”达到饱和吸附,U又较强地吸附在H~+Cl~-表面这一观点,对上述现象进行了定性的解释。
Corrosion of 45 steel with hydrochloric acid up to 12 N at 25 ° C and different concentrations of hexamethylenetetramine (U) and 2.4 at 8.7 N (~ 28%) HCl were studied using classical potentiostatic polarization curves. Inhibition of 6-trimethylpyridine (TMP) alone or in combination. It is found that when the concentration of hydrochloric acid is above 8.7N, the cathodic polarization curve tends to coincide, and the increasing tendency of corrosion effect gradually decreases. In 8.7NHCl U is a strong cathode corrosion inhibitor, which has a much higher corrosion inhibition than TMP. When the two are used in combination, the TMP only superadditively when the impurities are small, but when the impurities are more, it can produce intense Synergy. In this paper, H ~ + Cl ~ -_ “molecule” is saturated adsorbed on the interface of Fe / high concentration hydrochloric acid and U is strongly adsorbed on the surface of H ~ + Cl ~ - .