Power supply for anodising?

[Zeeflyboy]

The current dropping off is doing a constant voltage technique though no? You seem to be describing constant voltage but with a limit on the current.

My understanding is that the constant current technique tries to maintain whatever current you have set by raising the voltage. So one takes the sq ft of the part, multiply by 6 (if using 6asf) and then set that result in the power supply, which will then slowly raise the voltage as necessary to maintain that current. Using the 720 calculator you can then determine that at 6asf for example, the final voltage will be 15v and it will take 2hrs for a 1mil layer.

Thanks for all the tips - I believe I should be using a polypropylene tank, my slight problem is that my larger parts are quite long. I found a suitable polypropylene container in home base, but to get enough length its a 60L tub, which is a lot of acid, heavy and a big thing to store when it's far wider than needed in reality. I could get away with something much thinner, but never seen anything suitable and not sure how I would go about building my own tank.

Would a fish tank work? You can get those fairly long and thin, but not sure about the sealant they use and the acid.