A. Lekatou, E. Regoutas
The corrosion behaviour of an HVOF Ni–5Al/WC–17Co coating on Al-7075 is investigated in 0.5 M H2SO4. The study explores pseudopassivity within the temperature range of 25–45°C, highlighting its protective effects against localized corrosion. At 25°C, pseudopassivity unfolds in three distinct stages: (1) oxidation of W in the binder phase, (2) simultaneous oxidation of W in the binder and carbide particles, and (3) intensive hydration of WO3, leading to the formation of Co3O4. The formation of a bi-layer surface film during stages two and three is proposed, where the inner layer, composed of anhydrous oxides, acts as a barrier, while the outer layer of WO3/C1-xH2O remains unstable. In instances of film disruption, it is noted that the bond coat effectively mitigates corrosion propagation into the Al-alloy. Additionally, higher electrolyte temperatures are correlated with increased corrosion kinetics and a greater susceptibility to pitting.
@article{a6b215e5-c061-4899-83f6-191e1badd57d,
title={Corrosion behaviour of cermet-based coatings with a bond coat in 0.5 M H2SO4},
author={A. Lekatou and E. Regoutas},
year={2008},
language={en}
}TY - JOUR TI - Corrosion behaviour of cermet-based coatings with a bond coat in 0.5 M H2SO4 AU - A. Lekatou AU - E. Regoutas PY - 2008 LA - en ER -
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