Topic: Anodizing Defect

I have been doing some work on an anodizing facility and encountered some defects which are quite difficult to understand.

1) We have some spots which look like burns on naturally anodized and electro colored aluminium about an inch in diameter, about 2-4 in a whole extrusion

2) We also have some small white spots which give the extrusions a rough texture although they are a bit rare

3) I would like to know if there are other causes of surface streaks on anodized aluminium apart from existence of oxides in the billets due to poor dross removal and filtration during casting?


Re: Anodizing Defect

Hello Boniface,

There are some suggestions and thoughts that seem to address issues that could be your problem in this previous post..... … html#p2213