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一般认为,常压塔顶系统腐蚀的原因是由于氯化钙和氯化镁水解所形成的HCl所引起,然而,现在很多炼厂感到:尽管有良好的脱盐和pH控制,其常压塔顶系统的腐蚀仍然是严重的。通常认为,在常压塔顶系统所测出的高腐蚀率是由于液体中酸的浓度太高所致。但电化学数据表明:除氢离子外尚存在着其他腐蚀剂,且可引起很高的腐蚀率。由于这种腐蚀没有涉及pH值的腐蚀问题,因为塔顶
It is generally accepted that the cause of corrosion of the atmospheric overhead system is due to the HCl formed by the hydrolysis of calcium chloride and magnesium chloride. However, many refineries now feel that despite good desalination and pH control their atmospheric overhead system Corrosion is still serious. It is generally accepted that the high corrosion rate measured in an atmospheric overhead system is due to the acid concentration in the liquid being too high. However, the electrochemical data show that in addition to hydrogen ions there are other etchants, and can cause high corrosion rates. Because of this corrosion is not related to pH corrosion problems, because of the top of the tower