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Mechanical Properties of a Mackinawite Corrosion Product Layer

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To develop a holistic understanding of corrosion mechanisms in upstream oil and gas pipelines mechanical properties of the corrosion product layers as well as corrosion mechanisms need to be studied for better prediction of general and localized corrosion. Various ongoing research has focused on the topic of sour corrosion mechanisms while minimal attention has been paid to ascertaining the mechanical properties of the iron sulfide layers developed in these environments. The effects of fluid flow (i.e. erosion/corrosion wall shear stress) as well as the impact of different operations (i.e. wellbore cleaning wireline tools) on the internal pipeline wall may lead to a partial removal of corrosion product layers. This is an important topic since the mechanical damage of protective iron sulfide layers may lead to localized corrosion. To investigate the magnitude of stress required to damage iron sulfide layers up to the point of exposing the substrate well-defined iron sulfide layers were developed in a 4-liter glass cell and the mechanical properties of the layers such as hardness and adhesive strength were investigated using a mechanical tester. To develop the iron sulfide layer UNSG10180 carbon steel specimens were exposed to a 1 wt.% NaCl solution at pH of 6.0 well purged with a 10 mol.% H2S/N2 mixture. Fes layers were developed at two solution temperatures 30⁰C and 80⁰C and the hardness and interfacial shear strength of the layers formed after 1 day and 3 days were investigated. The morphological characteristics of the FeS layers under investigation were examined by conducting an SEM and cross-sectional analysis. XRD analysis confirmed mackinawite as the phase of the iron sulfide layer. While the interfacial shear strength of this FeS layer was found to be 5 magnitudes higher than the maximum flow related shear stress the integrity may be compromised if these layers are subjected to other mechanical impacts that may occur during production.

Product Number: 51319-13441-SG
Author: Ezechukwu Anyanwu
Publication Date: 2019
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