Abstract
SUMMARYThe performance of accelerated aged (post-treatment) nickel fluoride cold sealed finishes is compared with those of room temperature aged and conventional hydrothermal sealed finishes. It was found that accelerated ageing at temperatures of 60 and 80°C for 5–30 minutes in deionized water will improve the results of sealing quality tests of cold sealed anodized finishes, however it does not satisfy all the sealing quality tests applied to conventional hydrothermal sealed films. The results of acid dissolution and dye spot tests are acceptable for post-treated cold sealed films, and in general even better results than conventional hydrothermal sealing can be obtained with various metal salts used as post-treatment. Nevertheless, the admittance test was found to be difficult to satisfy and further ageing of 1–14 days was necessary to pass it. Such a problem was overcome by dual sealing, in which the cold sealed film was treated for a very short time (0.5min/μm) in boiling deionized water, resulting in...
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