Next Article in Journal
The Effect of Anchor Volume on the Mechanical Strengths of Orthodontic Micro-Implants
Next Article in Special Issue
Characterization of the Microstructure, Mechanical Properties, and Corrosion Resistance of a Friction-Stir-Welded Joint of Hyper Duplex Stainless Steel
Previous Article in Journal
Deformation Behavior of Al0.25CoCrFeNi High-Entropy Alloy after Recrystallization
Previous Article in Special Issue
Effect of Heat Treatment on the Microstructure and Mechanical Properties of Nitrogen-Alloyed High-Mn Austenitic Hot Work Die Steel
Article Menu
Issue 4 (April) cover image

Export Article

Open AccessArticle
Metals 2017, 7(4), 109;

Corrosion Behavior of API X100 Steel Material in a Hydrogen Sulfide Environment

Center of Advanced Materials, Qatar University, 2713 Doha, Qatar
Gas Processing Center, Qatar University, 2713 Doha, Qatar
Department of Metallurgical and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University, 43721 Suez, Egypt
Author to whom correspondence should be addressed.
Academic Editor: Robert Tuttle
Received: 8 February 2017 / Revised: 7 March 2017 / Accepted: 14 March 2017 / Published: 25 March 2017
(This article belongs to the Special Issue Alloy Steels)
View Full-Text   |   Download PDF [3874 KB, uploaded 25 March 2017]   |  


Recently, the API X100 steel has emerged as an important pipeline material for transportation of crude oil and natural gas. At the same time, the presence of significant amounts of hydrogen sulfide (H2S) in natural gas and crude oil cause pipeline materials to corrode, which affects their integrity. In this study, the effect of H2S concentration on the corrosion behavior of API X100 in 3.5% NaCl solution is presented. The H2S gas was bubbled into saline solutions for different durations, and the corrosion tests were then performed using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM) techniques were used to characterize the corroded surface. The results indicate that the corrosion rate of API X100 steel decreases with increasing H2S bubbling time due to the increase in H2S concentration in 3.5% NaCl solutions. It is noticed that an accumulation of a critical amount of hydrogen in the metal can result in hydrogen-induced crack initiation and propagation. It was further observed that, when the stress limit of a crystalline layer is exceeded, micro-cracking of the formed protective sulfide layer (mackinawite) occurs on the API X100 steel surface, which may affect the reliability of the pipeline system. View Full-Text
Keywords: H2S concentration; corrosion; sour environment; API X100 steel; sulfide layer H2S concentration; corrosion; sour environment; API X100 steel; sulfide layer

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Okonkwo, P.C.; Shakoor, R.A.; Benamor, A.; Amer Mohamed, A.M.; Al-Marri, M.J.F.A. Corrosion Behavior of API X100 Steel Material in a Hydrogen Sulfide Environment. Metals 2017, 7, 109.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top