Effect of Film-Forming Amines on the Acidic Stress-Corrosion Cracking Resistance of Steam Turbine Steel
Tim De Seranno,
Ellen Lambrechts,
Evelyn De Meyer,
Wolfgang Hater,
Nathalie De Geyter,
Arne R. D. Verliefde,
Tom Depover,
Kim Verbeken
Affiliations
Tim De Seranno
Department of Materials, Textiles and Chemical Engineering, Research Unit Sustainable Materials Science, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
Ellen Lambrechts
Department of Materials, Textiles and Chemical Engineering, Research Unit Sustainable Materials Science, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
Evelyn De Meyer
Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
Wolfgang Hater
Kurita Europe GmbH, Niederheider Straße 22, D-40589 Düsseldorf, Germany
Nathalie De Geyter
Department of Applied Physics, Research Unit Plasma Technology, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium
Arne R. D. Verliefde
Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
Tom Depover
Department of Materials, Textiles and Chemical Engineering, Research Unit Sustainable Materials Science, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
Kim Verbeken
Department of Materials, Textiles and Chemical Engineering, Research Unit Sustainable Materials Science, Ghent University, Technologiepark 46, 9052 Zwijnaarde, Belgium
This work evaluates the effect of film-forming amines (FFA) on the acidic stress-corrosion cracking (SCC) resistance of NiCrMoV turbine steel. Contact angle measurements show an increased hydrophobicity of the surface when coating the steel with oleyl propylene diamine (OLDA). According to potentiodynamic measurements and post-mortem scanning electron microscopy (SEM) analysis, anodic dissolution and hydrogen embrittlement still occur when the steel is FFA coated. In situ constant extension rate testing (CERT) in acidic aqueous environment at elevated temperature of FFA-coated steel shows a ductility gain compared to non-coated steel, explained by a decrease in both corrosion rate and hydrogen uptake.
