酸性水罐腐蚀的联合保护

Combination Corrosion Protection for Sour Water Tanks

针对酸性水罐内壁的腐蚀,传统的方法是在检修期间,采用环氧玻璃钢、环氧玻璃鳞片对罐内壁进行修复。由于涂料本身固有的特性特征(比如涂料本身存在针孔等),导致酸性水罐重新采取上述方法后,短期内仍出现龟裂、脱层。在对国内若干家炼化企业进行调研的基础上,解析酸性水罐的腐蚀成因,提出经过实践过的MO+AR联合保护的防腐方法,该方法既具有耐酸、耐碱特性,也具有一定的耐油性和导静电性,并增加AR牺牲阳极辅助防腐(即联合防腐)。此防腐方法用于某石化公司新建的5 000 m3酸性水罐具体方案设计。

The conventional corrosion protection for the internal wall of sour water tank practiced by Dalian West Pacific Petrochemical Co. , Ltd. was the repairing of the internal wall with epoxy glass steel and epoxy glass flake coating during the scheduled overhaul. Due to the inherited conditions of coatings （ such as pin holes in the coating）, the cracking and spalling of the coatings occurred not long after application of the coatings. Based upon the investigations of the operations of several petrochemical companies in China, the causes of corrosion of sour water tank were analyzed and combination MO ＋ AR corrosion protection method was recommended. This method is characterized by its resistances to acids and caustics and resistance to oil and conductivity of electrostatics as well as cathodic protection by AR sacrificing anode. This method has been applied in the engineering design of a new 5 000 m3 sour water tanks.