Abstract
SUMMARYA simple and rapid electrochemical method for the checking of the quality of anodic coatings on small decorative parts of aluminium is presented. This so-called ALU-buckle-test was developed and optimized for the quality control of anodized coloured and sealed buckles for watch bracelets. In the test the buckle is made the cathode in an electrochemical cell. The time it takes to reach a defined current density induced by an applied voltage, typically 1.6 V, is taken as the criterion of quality. The influence of different production conditions such as time of anodizing and time of sealing on the testing results has been studied. The results of the electrochemical test were observed to be affected by the quality of sealing, the coating thickness and the presence of flaws. It was found that this test provides an excellent criterion for the coating quality that correlates excellently with the well-known Alcoa test (ISO 3210) and a gravimetric method for the determination of the porosity of porous surfa...
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