Accelerated Weathering and Corrosion Testing
Evaluating a coating’s resistance to an environment prior to full-scale installation can help avoid costly premature failure and product contamination. While this testing can be performed by mounting panels containing candidate coating systems in the actual service environment, it can take years to generate discriminating data. As part of KTA’s Physical Testing Laboratory, our chemists and chemical technicians perform exposure testing on coated test panels that simulate the coating’s ability to “weather” outdoor conditions/environments over a period of time.
Accelerated weathering and corrosion testing capabilities include exposure to ultraviolet lights, corrosive environments, and extreme temperature and humidity conditions. Our eight ultraviolet light chambers can be equipped with a variety of lamps producing various spectra of UV radiation including UVA-340, UVB-313, FS-40, and others. Three salt fog chambers and four cyclic salt fog chambers are used to simulate marine, caustic, or acidic conditions. Four controlled temperature and humidity chambers and four freezers can be used for thermal cycling and extreme condition exposure. Commonly performed exposure regimes include (but are not limited to) ASTM B117, ASTM D5894, ASTM D4587, ASTM D4585, ASTM D2247, ASTM D6944, ASTM G85, GM9540P, SAE J2334, CCT-1, CCT-4, ASTM D4585, ASTM B368, ASTM D1735, ISO 12944-6, ISO 20340, ISO 11997-2, military and automotive specifications, IICL testing and more.
KTA also performs accelerated exposures to evaluate a coating’s resistance to cathodic disbondment (ASTM G 8 and G 42), as well as resistance to immersion in a variety of media using immersion vessels or Atlas Cells, or Corrocels (ASTM C 868/NACE TM01-74) for one-sided testing to evaluate the cold wall effect on a lining system. Should unique conditions require a process that is unlike any published standard, KTA can custom design a testing regime to address specific conditions.
Methods for evaluating specimens following exposure include undercutting resistance (ASTM D1654), Blistering (ASTM D714), Rusting (ASTM D620), Color and Gloss retention (ASTM D2244 and ASTM D523, respectively), and Chalking (ASTM D4214).