Development of Thin Metal Film Corrosion Indicators

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Abstract
An account is given of the development of visual and electrical corrosion indicators which utilize thin metal films vacuum-deposited on non-metallic substrates. Data are presented showing the behavior of these indicators in corrosive atmospheres. Although the indicators were developed primarily to detect and mark corrosive conditions in packages and storage areas, other possible applications are described briefly. Data reported include comparative corrosion information on electrical cards and buttons in various humid atmospheres, condition of visual and resistance thin film indicators at first sign of corrosion on hardware items, and behavior of polyvinyl resistance card indicators at different sensitizations at 25 C and 60 percent relative humidity. The paper presents the progress of this development program from the feasibility studies through the final development of manufacturing protypes. 3.23

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