炼油厂原油罐底板的腐蚀与防护

针对兰州炼油厂原油罐底板腐蚀泄漏情况严重的问题，对三具原油罐底板的腐蚀情况做了检测及原因分析。原油罐底板的腐蚀形貌主要是点蚀和溃疡腐蚀，其中点蚀是由罐底污水中的氯离子造成的，而溃疡腐蚀是由原油污泥形成的垢下腐蚀造成的。针对原油罐腐蚀特性，经过实验，提出了铝牺牲阳极电化学保护与涂刷耐腐蚀涂料相结合的防护措施。实时监测所得的罐底板电位始终处于-085～-10V范围内，表明原油罐底板的腐蚀得到了有效控制，底板与电极接触可靠，达到了原油罐长效防护，炼油厂原油安全储运之目的。

Corrosion control of bottom plates of erude oil storage tanks in oil refineries

s The bottom plates of crude oil storage tanks in Lanzhou Oil Refinery suffered serious corrosion and leakage was resulted． The corrosion of the bottom plates of 3 oil tanks is detected and the reasons are analyzed． The main types of the corrosion are pitting corrosion and ulcerative corrosion the former is caused by the chlorine ion in the wastewater in the tank bottom and the later is resulted from the crude oil dirt corrosion． In the light of the characteristics of the corrosion it is proposed to carry out Al sacrificial anode electrochemical protection combining with anticorrosion coating． Real time monitoring shows that the corrosion of the bottom plates are controlled effectively and the long acting protection of the oil tanks is realized．