Dependance of naphthenic acid corrosion of SA106B on temperature and turbulence

Analysis about the kinetic mechanism of Naphthenic Acid Corrosion (NAC) indicated that the natural logarithm of corrosion rate (lnr) was proportional to negative reciprocal of temperature(-1/T,K), linear regression on the corrosion data in API581 and experiments both proved the linear relationship between lnr -(-1/T,K) which could be applied to predicate the average corrosion rate under different temperature. Corrosion morphology observations proved the influence of turbulence on NAC, measurements on the maximum corrosion depth in different turbulence area indicated that in 7.5% turbulence area the corrosion depth could be 2-3 times of the corrosion depth in 2% turbulence area, existence of turbulence could lead to serious local NAC. (paper)