Abstract
Assessment of durability of coatings is crucial for researcher especially for design of paints which would have service life warranty. As natural exposure takes several months for such studies, there is tendency today to use faster techniques like UV testers and Xenon arc weatherometers. Although these techniques are several times faster than natural exposure, it takes few weeks for coating chemist to observe any degradation. Among quicker techniques, plasma erosion is found to be useful one. Oxygen plasma produces extremely rapid degradation and few hours of exposure to plasma provides effects of several years of natural weathering. Advantages of the technique are speed and plasma equipments are cheaper than weatherometer. Results obtained with plasma erosion technique are found to have good correlation with results of exposure under Xenon arc source.
Highlights
Over the last three decades, the organic coatings industry has undergone rapid technological and structural changes
In the context of plasma enhanced chemistry reactors, the plasma is created in a vacuum chamber which contains a constant flow of a gas at reduced pressure which is typically in the order of 1 mbar. This gas is exposed to a radio frequency (RF) potential which results in the partial ionisation of the gas
It was found that plasma exposure at 100 W energy for one hour is required to carry out sufficient degradation of organic binder
Summary
Over the last three decades, the organic coatings industry has undergone rapid technological and structural changes. Further changes have been induced by competitive and consumer pressures to to produce environmentally and user friendly coatings without sacrificing ease of application, initial appearance or most importantly without significantly reducing the service life of the coating system The consequence of these changes has been displacement of almost all previously commercially important well established coatings (largely high solvent coatings) by newer systems, the formulation and application of which are based on different chemistries and technologies. At present generating a reliable performance histories for a new coating requires an extensive in-service or out-door exposure program. Attempts at avoiding this task, by employing various forms of short term laboratory-based aging tests. Attempt is made here to explain a laboratory techniques which uses plasma to predict service life of coatings
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