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51314-4159-Corrosion and Its Inhibition Under Iron Sulfide Deposits: Laboratory Testing Method Development

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Concerning corrosion rate under iron sulfide deposits. A laboratory iron sulfide synthesis method and an iron sulfide under-deposit corrosion testing methodology were developed to better assess and monitor this type of corrosion in a simulated pipeline environment.

Product Number: 51314-4159-SG
ISBN: 4159 2014 CP
Author: Yingrui Zhang
Publication Date: 2014
Industries: Test Method , Science of Corrosion
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Different from other types of pipeline solids such as sand and iron carbonates iron sulfide is semi-conductive and electrochemically reactive. This adds extra complexity to laboratory testing and evaluation compared with inert deposits. Previous laboratory testing has shown that the corrosion rate under iron sulfide deposits can be severely overestimated using electrochemical techniques. In the current work a laboratory iron sulfide synthesis method and an iron sulfide under-deposit corrosion testing methodology were developed to better assess and monitor this type of corrosion in a simulated pipeline environment. Two different types of iron sulfides were used to investigate the corrosion of carbon steel under such deposits. Scanning Electron Microscopy (SEM) X-ray diffraction (XRD) and particle size analysis were utilized to characterize the surface morphology composition crystal structure and particle size of the different iron sulfides. A white light interferometric volume loss method was used to verify the under-deposit corrosion rate continuously monitored by the Linear Polarization Resistance (LPR) technique. A number of experiments were conducted to study the effect of corrosion inhibitor to mitigate corrosion underneath the iron sulfide. The effectiveness of corrosion inhibitor was characterized using both the pitting analysis and corrosion rate measured using electrochemical techniques.

 

Key words: Under-deposit corrosion, UDC, iron sulfide, FeS, inhibition

Different from other types of pipeline solids such as sand and iron carbonates iron sulfide is semi-conductive and electrochemically reactive. This adds extra complexity to laboratory testing and evaluation compared with inert deposits. Previous laboratory testing has shown that the corrosion rate under iron sulfide deposits can be severely overestimated using electrochemical techniques. In the current work a laboratory iron sulfide synthesis method and an iron sulfide under-deposit corrosion testing methodology were developed to better assess and monitor this type of corrosion in a simulated pipeline environment. Two different types of iron sulfides were used to investigate the corrosion of carbon steel under such deposits. Scanning Electron Microscopy (SEM) X-ray diffraction (XRD) and particle size analysis were utilized to characterize the surface morphology composition crystal structure and particle size of the different iron sulfides. A white light interferometric volume loss method was used to verify the under-deposit corrosion rate continuously monitored by the Linear Polarization Resistance (LPR) technique. A number of experiments were conducted to study the effect of corrosion inhibitor to mitigate corrosion underneath the iron sulfide. The effectiveness of corrosion inhibitor was characterized using both the pitting analysis and corrosion rate measured using electrochemical techniques.

 

Key words: Under-deposit corrosion, UDC, iron sulfide, FeS, inhibition

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