Method for cleaning blind holes of aluminum alloy parts after chromic acid anodization（1）

solution

In order to ensure the cleaning quality of aluminum alloy parts after chromic acid anodization in batches, the cleaning process after chromic acid anodization in the normal production line is completed, and a special cleaning for each part is added, that is, the blind hole of the part is flushed with a water pipe . After special cleaning of the parts, the phenomenon of blind hole bleeding has been greatly improved, but there are still some parts that are not thoroughly cleaned, resulting in chromic anhydride bleeding. The main reason is that when the water pipe is flushing against the blind hole, the water flushed in the previous stage will fill the blind hole and it is difficult to flow out smoothly. As a result, the later flushing water cannot enter the blind hole. The chromic anhydride cannot be thoroughly cleaned. Therefore, although after a large amount of running water cleaning, the residual chromic anhydride in the gadolinium can only gradually reduce its concentration by diffusion, but it is not enough to clean the chromic anhydride remaining in all blind holes. In view of the above-mentioned cleaning problems, after the water pipe is rinsed, use a cotton swab to scrub each self-hole again. The wall of the hole that can be touched by the cotton swab can be wiped repeatedly to remove the chromic acid in the hole. Through the improved method, the cleaning quality is significantly improved. Since general parts generally have more holes, and each batch has a large number of parts, use cotton swabs to wipe the holes one by one, which has high dynamic strength, and the residual chromic anhydride in each hole is different, so there is no guarantee that cotton will be used. Wipe each blind hole thoroughly, and there will be some residual chromic anhydride bleeding in individual holes. To thoroughly solve the problem of cleaning the anodizing solution in the holes, the key is to take feasible methods to make the cleaning water in the blind holes of the parts It can be updated in time and flow out naturally. To this end, a medical syringe is used to clean the blind holes of the parts, that is, the needle is inserted into the bottom of the hole, and through multiple injections of water, the newly injected cleaning water is injected from the bottom of the blind hole to the mouth of the hole. The water comes out. Using this method, the phenomenon of blind holes not being cleaned is fundamentally solved.