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EdStainless, Yes i am very aware and great precautions will be taken.

EdStainless, Of Course

Hi! I am looking for a chromic acid based deoxidizer/desmutter formula. The Wernick, Pinner and Sheasby book has a guide. My old man had a copy laying around but just like most things in life; when you are looking for something, it's never there, but when you don't need it, you trip over it all...

Thanks guys!

jari001, Thanks for breaking it down! Another question, if you don't mind...What would be the proper mixing steps to make a bath? I am looking up the concentration.

"Mixture of 50% v/v nitric acid + 20-25% v/v sulfuric acid + 1-2 lb/gal ammonium bifluoride, balance water to 100%." It is a tri-acid solution for desmutting/deoxitsizing die cast aluminum allow (383) before chromate conversion coating. Can anyone walk me through the formula plz! Thanks! Here...

rb1957, If the part is cheap to replace then live with it. If the part is expensive, make your own part out of stainless, and sell as an unlimited life part. Not cheap, and above all, a PITA to replace. I really dont want to have to open it back up again. I wish i could make my own spider but...

racookpe1978, Your problem would come in when the modestly thick powder coating plastic layer (applied as a sprayed-on powder then melted in a furnace) would fill-in drilled bolt holes, or cover a surface where the arms attach so the stack height of the assembly is too big. You mean clearance...

racookpe1978. The AI arm bolts to the stainless steel. Would tightening down the bolts break the powder coating?

Very insightful romke! So i guess now its between 2 part epoxy primer or powder coating. Love to hear your opinion.

Forever might be a stretch. I just want to give the arm the longest possible life, even if the longest feasible is 4 years (since 3 years seems to be the current deal). And i would like to accomplish that in the form of a coating. That way at least i can say i did the best i could.

OK. Can you suggest a paint?

So painting it would be better than priming it with epoxy? Or anodizing it? Or coating with coal tar epoxy? Or zinc chromate?

The aluminum part i want to protect is part of a washing machine. It's called a spider-arm, and it's attached to a stainless steel drum. The drum is of course where you put your clothes. It spins at speeds of 1200rpm. The load (clothes) can be unevenly distributed in the drum, therefore it could...

Ron... Question: How would any corrosion (filform) develop if the part is properly sealed?

The aluminum part i want to seal is part of a washing machine. It's called a spider-arm, and it's attached to a stainless steel drum. The drum is of course where you put your clothes. This setup is (afaik) only on front load washers. The thing is, the spider always corrodes and breaks - mine...