This project focuses on an important corrosion process for carbon steel pipelines transporting corrosive fluids, i.e. underdeposit corrosion. Corrosion control for general (uniform) corrosion of these pipelines is fairly well established, and corrosion control practices with use of inhibitors, monitoring and inspection are effective. However, solid deposits on the pipe walls can lead to localized corrosion, and corrosion control for this “under-deposit corrosion” is not as well defined or as readily monitored.
The underdeposit corrosion performance of carbon steel under aerated and de-aerated (N2 and CO2) environments is studied. The purpose of this study is 1) to identify useful laboratory methods to examine underdeposit corrosion, 2) to demonstrate the validity of these tests and 3) to investigate the factors affecting underdeposit corrosion.
The methods used to study underdeposit corrosion are linear polarization resistance (LPR), galvanic corrosion, rotating disc electrode (RDE), and multi-electrode array methods for cathodic current distribution and change in environment.