51313-02512-Naphthenic Acid Challenges of Iron Sulfide Scales from Model Oil on Mild Steel at High Temperature

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Product Number: 51313-02512-SG

ISBN: 02512 2013 CP

Author: Gheorghe Bota

Publication Date: 2013

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Iron sulfide scales are formed by sulfur corrosion on the inner walls of refinery distilling towers and transfer lines operating on sour crude oils. Sulfide scales are generally considered to partially reduce corrosion by other corrosive species in crudes especially naphthenic acids. Sulfur and naphthenic acid corrosion occur simultaneously at similar high temperatures in both distilling units and corrosion research studies. Because the formation of sulfide scales affects the corrosion rates by sulfur species and naphthenic acids differently corrosion investigation treating them together has hindered an understanding of their competitive corrosion mechanisms. This research study aims to disconnect the corrosive processes at high temperature by generating iron sulfide scales on metal surfaces using model oil compounds and then challenging the scale protectiveness with naphthenic acid. The iron sulfide scales were generated on metal samples in the same experimental apparatus where they were later challenged by the naphthenic acids. This challenge procedure represents refinery operation to an extreme in that refineries routinely swing crude composition varying both sulfur and naphthenic acid concentrations. Experimental conditions (i.e. temperature velocity) used during in this sulfide/challenge protocol were chosen to match as much as possible operating conditions in distilling towers and their transfer lines.