Reactive Metals Forum

i’m fairly new to anodizing niobium and only use the techique as called for with a project. I don’t do this every day as you likely do in your shop. Thus, my TSP and etching solutions may be ”older” than yours at times. I can always make up fresh TSP solution in small quantities and ensure I’m always using fresh solution, but the etchant is more problematic. The way it is packaged I have to make up the whole 1/2 gallon of the 2X concentrate all at one time. (I would make smaller lots if I could divide the dry powder accurately, better yet buy it in smaller units.) I then make up only 1 cup of the 1:1 dilution for a hot etch. After use I always decant it into a heavy polystyrene (?) lidded container for reuse later. I toss this diluted solution if I notice any color tint. Sorry for the long intro ... Because my use is so limited at times, these soultions tend to ”age in place”. Are there any tell-tales to look out for as an early indicator that it is time to use fresher reagents, or explain what I’m seeing when things go differently than expected? Thanks, Rick https://www.reactivemetals.com

I'm a new member, nice to meet everyone !!!

I teach our fold forming classes and I read that niobium can be fold formed My concern is that with copper, I anneal it fairly often with some folds What folds can be done with it any hints? I love making pea pods by hammering on the folded curve, but I always have to anneal those before I can open them. I have this dream of nice green pea pod.