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Degradation of zinc oxide thin films in aqueous environment:. Part II – Coated Films
Author(s) -
De Rosa L.,
Mitton D. B.,
Monetta T.,
Bellucci F.,
Springer J.
Publication year - 2001
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200112)52:12<931::aid-maco931>3.0.co;2-b
Subject(s) - dielectric spectroscopy , zinc , nuclear chemistry , materials science , delamination (geology) , aqueous solution , electrochemistry , thin film , degradation (telecommunications) , silane , chemistry , analytical chemistry (journal) , polymer chemistry , chemical engineering , composite material , nanotechnology , metallurgy , electrical engineering , electrode , organic chemistry , biology , subduction , tectonics , paleontology , engineering
In Part I of this research, the degradation mechanism of two different bare ZnO thin films was assessed. Degradation of the electrical properties of ZnO as well as changes in morphology were observed for both films. In the current paper, the degradation of zinc oxide thin films coated with protective acrylic paint is addressed during exposure to (i) an aqueous 3.5% NaCl solution at 85°C and (ii) a standard damp heat test at 85% R.H. and 85°C. Electrical and electrochemical techniques were employed to monitor zinc oxide degradation during exposure to the test environments. Electrochemical Impedance Spectroscopy was employed to investigate the delamination phenomena at the ZnO/coating interface and a simple equivalent circuit was developed to quantitatively measure the delamination ratio. The effect of different silane based adhesion promoters (glycidil‐oxypropyl‐trimethoxy‐silane and amminopropyl‐trimethoxy‐silane) was also investigated.