Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

51317-9363-Surface Chemistry of Iron Sulfide Scale and its Influence on Corrosion occurring underneath

Picture for 51317-9363-Surface Chemistry of Iron Sulfide Scale and its Influence on Corrosion occurring underneath
Available for download

This paper describes the formation of a mackinawite scale on carbon steel in a borate buffer pH = 8.4. Then, it was exposed to different buffers with lower pH. The integrity of the scale and the corrosion occurring underneath was monitored with electrochemical impedance spectroscopy (EIS).

Product Number: 51317-9363-SG
Author: Omar Yépez / Nihal Obeyesekere / Jonathan Wylde
Publication Date: 2017
Industry: Science of Corrosion
$20.00
$20.00
$20.00

The corrosion protection due to iron sulfide scales has been and continues to be a controversial issue in corrosion science. These scales are very important to understand the mechanism of sour corrosion. For instance, it is known that the point of zero charge (PZC) for mackinawite occurs at pH ~ 7.5. This implies that it is positively charged at pH < 7.5 and negatively charged at pH > 7.5. How this affects corrosion regimes underneath the scale is unknown. This paper describes the formation of a mackinawite scale on carbon steel in a borate buffer pH = 8.4. Then, it was exposed to different buffers with lower pH. The integrity of the scale and the corrosion occurring underneath was monitored with electrochemical impedance spectroscopy (EIS). Two distinct behaviors were identified. At pH values above PZC, general corrosion and low pore resistances were observed. At pH values under PZC, localized corrosion and a high pore resistances were detected. This last behavior also supports iron-sulfides as cathodic fuels for the corrosion process. It can be concluded that mackinawite’s PZC is a new important factor in the corrosion behavior of these scales.

Key words: conference papers, 2017 conference papers, Sour Corrosion, Fundamentals of Sour Corrosion Mechanism, Constant pH, Iron Sulfide scale.

The corrosion protection due to iron sulfide scales has been and continues to be a controversial issue in corrosion science. These scales are very important to understand the mechanism of sour corrosion. For instance, it is known that the point of zero charge (PZC) for mackinawite occurs at pH ~ 7.5. This implies that it is positively charged at pH < 7.5 and negatively charged at pH > 7.5. How this affects corrosion regimes underneath the scale is unknown. This paper describes the formation of a mackinawite scale on carbon steel in a borate buffer pH = 8.4. Then, it was exposed to different buffers with lower pH. The integrity of the scale and the corrosion occurring underneath was monitored with electrochemical impedance spectroscopy (EIS). Two distinct behaviors were identified. At pH values above PZC, general corrosion and low pore resistances were observed. At pH values under PZC, localized corrosion and a high pore resistances were detected. This last behavior also supports iron-sulfides as cathodic fuels for the corrosion process. It can be concluded that mackinawite’s PZC is a new important factor in the corrosion behavior of these scales.

Key words: conference papers, 2017 conference papers, Sour Corrosion, Fundamentals of Sour Corrosion Mechanism, Constant pH, Iron Sulfide scale.

Product tags
Also Purchased
Picture for Amine Corrosion in Gas Sweetening Plant: Causes and Minimization on Real Case Study
Available for download

51316-7187-Amine Corrosion in Gas Sweetening Plant: Causes and Minimization on Real Case Study

Product Number: 51316-7187-SG
ISBN: 7187 2016 CP
Author: hajatolah almasi
Publication Date: 2016
$20.00

This paper is presented as a practical guide to identifying the causes of corrosion in different sections of gas sweetening trains and ways to control and minimize corrosion in amine plants.
Picture for Challenges in Detectability of Amine Stress Cracking of Carbon Steels in Gas Sweetening Plant
Available for download

51315-5888-Challenges in Detectability of Amine Stress Cracking of Carbon Steels in Gas Sweetening Plant

Product Number: 51315-5888-SG
ISBN: 5888 2015 CP
Author: Saad Al Dhafiri
Publication Date: 2015
$0.00
Picture for 98405 STRESS CORROSION CRACKING OF CARBON
Available for download

98405 STRESS CORROSION CRACKING OF CARBON STEELS IN AMINE UNITS

Product Number: 51300-98405-SG
ISBN: 98405 1998 CP
Author: J.J. Gonzalez, S. Hernandez, A Viloria
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support