Thanks for the replies, I did everything you listed acidrain. I have used Red Devil sodium hydroxide in the past and I find it throws off more fumes (NaOH fumes are asthma inducing) while it’s working on the aluminum. Is it a stronger concentration vs. Caswell (sodium hydroxide) stripper?
I tend to go with sswee’s theory seeing as not all of the parts from the marker had spots on them after the preparation work and the clean parts look like different alloys. As I said before; the spots on the raw post prep metal prior to anodization looked like they where shinny layers of metal lying on top of the aluminum piece the spots ohm out telling me all of the anodization was removed. I’m hoping either Fibergeek or M_D will have a look at this problem and enlighten me.
Yes the part was originally polished my next step is to strip and polish all of the parts in question prep them and re-anodize them. Thanks again for all of the replies!
|