Accelerated climate test of color coated steel sheet is used to evaluate the weatherability of the coatings after simulating complex natural climate environment. Although the ultraviolet energy in the solar spectrum only accounts for 4% of the total solar energy, many materials are destroyed in the ultraviolet region, so using ultraviolet carbon arc, sunlight carbon arc, cylinder (gas) lamp and other light sources to radiate, and by adjusting temperature, humidity and oxygen flow, can achieve similar results with natural exposure.
CB/T 13448-2006 standard stipulates that the accelerated climate test of color-coated steel plate adopts the artificial accelerated ageing test machine with xenon lamp source, and recommends two alternative test modes, i.e. continuous light intermittent spraying and alternating light and darkness intermittent spraying. The test should be carried out according to the four test cycles provided in Table 4-15. The evaluation of the test results should be based on the CB/T 17695 Standard "Grading Method for Aging of Paint and Varnish Coatings" to evaluate the fading or discoloration, dulling, cracking, foaming, exfoliation and corrosion of the coatings.
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