Advanced
Research on Applied Mechanics and Manufacturing System, Pages 271-275, DOI
10.4028/www.scientific.net/AMM.252.271 (2012)
Study
on Corrosion Behavior of the 304 Stainless Steel in the Heavy Oil with High
Salt, High Sulfur and High Acid Value
Xiao Hong Wang, Yu Wei, Chun Yun Shao, Yi Jun Shi, Wei Xue, Jian
Feng Zhu
Abstract
Reports
research on the uniform corrosion and localized corrosion of 304 stainless
steel in heavy oil with high salt, high sulfur and high acid value using the
weight loss method and the electrochemical method. Researchers examined the
corrosion morphology of samples with and without corrosion product films and
the compositions of the corrosion product films using SEM and EDS.
The results reveal that the 304 stainless steel is inapplicable to
the refinery equipment of this heavy oil because of severe local corrosion even
if the uniform corrosion rate is as low as 0.0107mm/a. The salt corrosion and
sulfur corrosion occurs on the local surface of 304 stainless steel due to the
chloride ion formed by hydrolysis of salt in the emulsifying water. The water
soluble iron naphthenate produced by chemical reaction between naphthenic and
ferrous sulfides results in the local corrosion of the 304 stainless steel.
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