Company / Speaker: University of Calgary / Professor Y. Frank Cheng
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Internal Corrosion of Pipelines: Mechanisms, Modelling and Management

Internal corrosion of pipelines is a complex phenomenon, and the complexity arises from the fact that multiple chemical and electrochemical reactions occur simultaneously in the environment where numerous factors affecting the corrosion processes have interrelated each other. A fundamental understanding of the phenomenon is essential to modelling, prediction and management of the corrosion processes, providing recommendations to industry for improved pipeline integrity management.

This talk includes contents which are based the author’s extensive research experiences and interactions with industry in the last decades. A thermodynamic model was developed to determine the electrochemical anodic and cathodic reactions occurring during internal corrosion of pipelines under given conditions. Parametric effects such as solution pH, CO2 partial pressure, temperature, etc. were considered. The corrosion kinetics is quantified by considering the synergism of mass transfer, charge transfer and film formation in the corrosion processes. In addition to uniform corrosion, localised corrosion under deposit is paid much attention. The unique role of microorganism, particularly sulphate-reducing bacteria, in initiation and growth of corrosion pits was investigated. Numerical models were developed by integration of electrochemical corrosion with fluid hydrodynamics in the pipeline, enabling prediction of the location of corrosion occurrence and the corrosion rate over a long-term period of service. In addition to the multi-physics field coupling model for corrosion process simulation, conventional solution chemistry model and fluid mechanics-based model were also proposed for quick evaluation and prediction of internal corrosion rate.

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