Frequently asked questions

Yes. Which means the dimension of the anodised part changes. The amount of change Anodising is a process that converts aluminum to its oxide. The oxide is thicker than the aluminum that is consumed will depend on the anodising process conditions (temperature, current density, etc.) and alloy. Keep in mind that when calculating the shrinkage of a hole, you must double the amounts given because a hole has two sides. Different anodisers use slightly different process parameters. With all these variables, it is a good idea for the design engineer to contact the anodising plant under consideration and ask for their input.

Machining before hard coat anodising is much easier and saves considerable wear and tear on the tools. A good rule of thumb is that the hard coated surface has about the same hardness as nitrided steel (about 50 + Rockwell “C”).

eg. To create letters or symbols on a surface or to prevent buildup in machined bores or threads.

Yes, sections of a part can be masked. Flat areas can sometimes be more difficult to mask; holes and bores can usually be masked without too much difficulty. Lettering may be accomplished more satisfactorily either by casting them into the part or using laser engraving after anodising.