不同表面活性剂对氯化铵腐蚀的抑制作用研究

Dexiao Fu, Xishui Yu, Xin Huang, Guofu Ou, Tongzao Zhou, Zhenqian He
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引用次数: 0

摘要

氯化铵(NH4Cl)对热交换器的腐蚀是炼油厂经常发生的现象。在这种情况下,人们采用了多种方法来延长设备的使用寿命,如使用各种添加剂(如表面活性剂)或用水冲洗。本文采用无梗水滴技术和电化学测量方法进行了一系列实验,研究不同表面活性剂(阳离子、阴离子、两性离子和非离子)对 NH4Cl 腐蚀的影响。结果表明,表面活性剂的存在可以增加 NH4Cl 溶液的润湿性,减小溶液与测试材料之间的接触角。含有阴离子表面活性剂的 NH4Cl 溶液的表面张力最低,但其自腐蚀潜能最大。添加阳离子表面活性剂对腐蚀没有抑制作用,反而会增加腐蚀速度。不过,加入非离子表面活性剂可以显著降低 NH4Cl 溶液的腐蚀速率,不过抑制作用会随着温度的升高而减弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Studies on the inhibitory effect of different surfactants on ammonium chloride corrosion
Corrosion of heat exchangers by ammonium chloride (NH4Cl) is a common occurrence in the refineries. A variety of methods have been adopted to prolong the service life of equipment in such circumstances, such as the use of various additives such as surfactants or by washing with water. In this paper, a series of experiments are performed to investigate the effects of different surfactants (cationic, anionic, amphoteric, and nonionic) on NH4Cl corrosion using the sessile drop technique and electrochemical measurements. The results show that the presence of a surfactant can increase the wettability of an NH4Cl solution, decreasing the contact angle between the solution and a test material. The surface tension of an NH4Cl solution containing an anionic surfactant is the lowest, but the self-corrosion potential of such a solution is the greatest. The addition of a cationic surfactant has no inhibitory effect on corrosion, and indeed increases the corrosion rate. However, with a nonionic surfactant, it is possible to significantly decrease the corrosion rate of an NH4Cl solution, although the inhibitory effect decreases with increasing temperature.
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