Effect of Film-Forming Amines on the Acidic Stress-Corrosion Cracking Resistance of Steam Turbine Steel


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.

Funding source: Ghent University and the IMPROVED project. The IMPROVED; Interreg V Flanders—The Netherlands program; European Regional Development Fund; Research Foundation—Flanders (FWO) via grant 12ZO420N. Special Research Fund (BOF), UGent (grant BOF15/BAS/062, grant BOF01P03516 and grant 24J069-17).
Countries: Belgium ; Germany

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