Two same alloy pieces..different results

[bomscho]

Thanks to recent improvements, most things are running better in my anodizing setup. But this weird problem keeps occurring.

Two of the same pieces that need deox/desmut connected together here. Both were anodized (badly, see my dozen other recent threads), stripped in lye, rinsed, deox/desmut, then reanodized. One comes out fine, or fine-ish. The other is pitted and when it dries, the pits become white bumps.

Two pieces of the same alloy, under same treatment and anoed in the same run, anodized at different colors, one dark grey, the other less so. Both pitted unacceptably and took dye differently, neither very well.

One was anodized more often than the other, this was one piece's third run. But both were prepped the same way. I guess matching pieces must always be prepped, processed (and reprocessed) in lockstep, or both thrown out.

Thoughts?

[acidrain]

The previous problems on one and not the other become magnified in the next ano run.
You could strip and sand out the pits, and then they might be OK.
I wouldn't connect them that way... run individual wires to each of the parts, and then connected to a common bus bar (cross bar).