A good hard anodized film, in addition to strict process formula and operating conditions, but also to ensure that the required size of the aluminum work does not change and meet the requirements, you must pay attention to the following requirements:
(1) Smoothness of sharp angles: For aluminum parts to be hard anodized, where sharp corners, burrs and other sharp corners are not allowed, these parts may be partially overheated due to current concentration and the parts may be burnt.
(2) Surface finish: The surface finish of hard anodized aluminum parts has been changed. For rough surfaces, it looks flatter than the original after oxidation. For parts with higher finish, the surface finish is reduced after oxidation. 
(3)Size allowance: Parts that require hard anodization should have a machining allowance and a specified mounting clip. Sheet metal parts should be left with process allowance, in addition to being used for clamping, and can also be used as inspection samples. When the hard anodizing is carried out, the size of the part is changed. Therefore, in the machining process, the size before the anodizing is determined according to the thickness of the film layer and the size of the metal to be processed to meet the specified tolerance range.
(4) Special fixture: The fixture for hard anodizing should be specially designed. Because of the high voltage and high current during oxidation, it is necessary to keep the fixture and parts in good contact, otherwise it will penetrate or burn the parts where the parts and fixtures are in contact. .
(5) Partial protection: On the same part, there is a common anodization and a hard anodized part, so the process is arranged according to the finish and precision of the part. Normal anodization is usually performed first. The insulation method is to coat the insulating varnish with a spray gun or a brush, and dry it in the greenhouse for 30-60 minutes, and apply two layers.
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