High temperature oxidation and hot corrosion behaviors of PEO and PEO/polysilazane preceramic-based dual-layer coatings on Ti6Al4V alloy

Wang, S.; Wang, Y.; Cao, G.; Chen, C.; Zhu, Y.; Serdechnova, M.; Blawert, C.; Zheludkevich, M.L..; Zou, Y.; Ouyang, J.; Jia, D.; Zhou, Y.

Journalpaper

High temperature oxidation and hot corrosion behaviors of PEO and PEO/polysilazane preceramic-based dual-layer coatings on Ti6Al4V alloy

Abstract

The high temperature oxidation and corrosion behaviors of a plasma electrolytic oxidation (PEO) coating and a PEO/polysilazane (PEO/PSZ) dual-layer coating are investigated. After exposure in NaCl+Na2SO4 salt at 600 ℃ for 240 h, PEO coating tends to generate porous and loose scales, causing cracking or even complete peeling off from the substrate, and corrosion scales follow the law of formation-shedding-reformulation. After exposure in NaCl+Na2SO4 salt at 600 ℃ for 480 h, the PEO/PSZ coating exhibits a three-layer structure including the outermost corroded layer with sandwich structures, uncorroded Al2O3 particles-containing interlayer, and PEO bottom layer, which retards the continuous penetration of corrosive media and further diffusion of oxygen to the inner bulk alloy, resulting in a remarkable reduction of oxidation and corrosion rate.

DOI Link to Publication

URL: https://publications.hereon.de/id/51326/
Authors:Wang, S., Wang, Y., Cao, G., Chen, C., Zhu, Y., Serdechnova, M., Blawert, C., Zheludkevich, M.L.., Zou, Y., Ouyang, J., Jia, D., Zhou, Y.
Year:2023
In: Corrosion Science
Volume:216
Pages:111076
Publisher:Elsevier, Orlando
Type:Journalpaper
ISSN: 0010-938X
Cite as: Wang, S.; Wang, Y.; Cao, G.; Chen, C.; Zhu, Y.; Serdechnova, M.; Blawert, C.; Zheludkevich, M.L..; Zou, Y.; Ouyang, J.; Jia, D.; Zhou, Y.: High temperature oxidation and hot corrosion behaviors of PEO and PEO/polysilazane preceramic-based dual-layer coatings on Ti6Al4V alloy. In: Corrosion Science. Vol. 216 (2023) 111076. (DOI: /10.1016/j.corsci.2023.111076)