Aluminized Steel Corrosion In Refineries Typical Corrosion Resistance In The Environment

Because crude oil acid vaule and sulphur content is increasing, the refinery equipments corrosion is more and more serious.The typical examples are chlorinate, high temperature sulphur and high temperature cycloparaffin acid corrosion. These corrosion do great damage to equipment's safe operation and shorten service life. The leakage result from corrosion occurs very frequently and seriously threaten the unit' s safe operation. The traditional carbon steel can't meet the demand of safe operation. If using ordinary stainless steel material, not only the cost is very high, but also the effect is not good. On the other hand, the high-class stainless material, such as 316L, is too expensive. The aluminum diffused steel is ideal material to suit to the situation. It can inhibit the chlorinate, high temperature sulphur and high temperature cycloparaffin's corrosion and has good corrosion stability.The refinery equipments corrosion situation, equipment easily corroded parts and its harm are introduced and chlorinate, high temperature sulphur and high temperature cycloparaffin's corrosion reason is mainly analysized in this article. The aluminum diffused steel which is corrosion resistant to chlorinate, high temperature sulphur and cycloparaffin and so on is specially put forwarded. The aluminum diffused steel's property, specially it's excellent corrosion resistance to several typically corrosive medium mentioned in this article and its pratical application is demonstrated and compared by experimental datas. The commercial operation demonstrated that the corrosion resistance performance of the aluminum diffused steel was superior over that stainless steel,which contributed to the excellent corrosion resistance performance of the aluminum oxide film formed of the aluminum iron alloy at the high temperature, besides, the surface micro-hardness was 2 ~ 3 times greater than that of the base steel after aluminum diffusion, which made the steel more resistant to erosion. With aluminum diffused steel application, the refinery eqquipments' operation period is prolonged and unit' s safe and smooth operation is assured. The economy and society benefits is very striking. It is worthy to popularize in some relevant industries.