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A Systematic Evaluation of Polyurethane as a Conformal Coating for the Inhibition of Corrosion on Electronic Components
Author(s) -
Lin YihTsung,
Hsien ChiChen,
Chang JiinChyuan,
Liu ChongYean
Publication year - 1991
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199100004
Subject(s) - conformal coating , polyurethane , coating , corrosion , printed circuit board , immersion (mathematics) , chemistry , relative humidity , composite material , conformal map , electrochemistry , materials science , electrode , mathematics , computer science , pure mathematics , thermodynamics , operating system , mathematical analysis , physics
The corrosion of printed circuit boards can be effectively prevented with a polyurethane conformal coating. In this study, the protective performance of PU coating was investigated systematically through electrochemical measurements and simulated exposure/immersion tests. Some fungi tests were also included. All experimental results show that a polyurethane coating effectively inhibits corrosion on printed circuit boards. The optimal thickness of the coating film should be about 60 μm. Long‐term exposure tests showed that this coating material could preserve the reliability of the investigated printed circuit boards for more than 400 days in a 90% relative humidity environment at 25°C.