09163 Corrosion and Fouling in Petrochemical Environments

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Product Number: 51300-09163-SG

ISBN: 09163 2009 CP

Author: Bill G. Santos

Publication Date: 2009

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Although petrochemical process streams are primarily composed of hydrocarbons, corrosion and fouling is observed in various locations and environments in operating plants. An electrochemical high temperature and high pressure facility is used to study the corrosion behaviour of carbon, low-alloy and stainless steels in several petrochemical environments. The electrochemical techniques such as cyclic voltammetry and open circuit potential measurements are used to study the effect of metallurgy and surface roughness on the initiation of corrosion/fouling on carbon and stainless steels in several solutions (i.e. naphtha, raw pyrolysis gasoline and quench tower bottoms). The experiments are conducted using a quasi-reference Ag metal electrode. Initial results suggest that corrosion/fouling rates vary with surface roughness and conductivity, which are controlled, by varying the concentration of water. Scanning electron microscopy and energy dispersive X-ray analysis (SEM/EDX) is used to look at the nature of the deposit formed after applying the aforementioned electrochemical techniques. Electrochemical impedance spectroscopy (EIS) is used to determine the solution resistance of naphtha and quench tower bottoms. A number of fouling characteristics including the time for initial surface coverage, the rate of film formation and the properties of the surface film have been studied using cyclic voltammetry and open circuit potential.

Keywords: open circuit potential, fouling, cyclic voltammetry, stainless steel, naphtha, quench tower bottoms, raw pyrolysis gasoline