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This project has been concerned with the physical and numerical modeling of the conditions developed under disbonded coatings on steel, with a view to understanding the processes responsible for the conditions that lead to stress corrosion cracking.
This project has been concerned with the physical and numerical modeling of the conditions developed under disbonded coatings on steel, with a view to understanding the processes responsible for the conditions that lead to SCC. The physical model (not presented in detail in this paper) has used a polymer film covering a crevice of controlled thickness, with a controlled gas composition (air augmented with additional CO2) on the exterior of the film. pH has been monitored at locations down the crevice using fibre-optic sensors, and potential has been monitored at the same locations using salt-bridge to conventional reference electrodes. A numerical model of the same system has been developed using a commercial finite element package.
Keywords: stress corrosion cracking, carbonate/bicarbonate, steel, numerical model
This paper provides an introduction on carbonate cracking and Los Angeles refinery’s recent experience with this corrosion mechanism. Also included in this paper is the methodology used for developing a risk assessment for equipment and piping susceptible to carbonate stress corrosion cracking in a fluid catalytic cracking unit (FCCU) gas plant.
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As a result of a Carbonate Stress Corrosion Cracking (CSCC) event at one refinery an investigation was made into the cause and mitigation of CSCC. This paper outlines the information obtained and the development of tools that could be utilized by other refinery fluidized catalytic cracker units (FCCU's) to better assess risk of CSCC.
Cases where alkaline-carbonate stress corrosion cracking (ACSCC) occurred, including a cold wall Fluid Catalytic Cracking (FCC) Unit regenerator and a mercaptan oxidation unit. This paper discusses work done to monitor on-going ACSCC risks through sour water sampling, chemical analysis, and ionic modeling.