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Originally Posted by mcaswell
Sounds like a type of pot metal you have there. No way that is going to anodize.
Try dropping a little acid on the part. If it fizzes violently, it's pot metal. Only thing you can do is plate it with Flash Copper.
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test by above, I don't think you are dealing with aluminum, I have anodized a lot of cast aluminum and never seen a reaction like you are talking about, the main problem with cast aluminum is a dark smut that will not tkey dye, or I should say show dye very well if any at all.
I have been working with cast a good bit, here is a part that i recently done, the trigger group, receiver are cast andozed and dyed black, the time on anodizing these parts is about 1/3 of the time calculated using the LCD method, I calculate eveyrthing out using the LCD method, but use par for the actual anodizing time and have no idea how thick of coatings I'm getting.
The trigger is good aluminum, 6xxx series I think, and takes dye like a hoover heha
Picture didn't upload here is a link
http://img.photobucket.com/albums/v4...eceiver004.jpg
Clint