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Parkerizing (manganese phosphate) different types of metal
I'm parkerizing an ornamental piece of cast iron and hot rolled steel.
The formula I'm using (phosphoric acid, manganese, water) works great on the cast iron. I get a very durable finish.
On the hot rolled steel however the finish is much less durable. I can't rub it off with a finger, but an aggressive stroke with a wire brush leaves bare metal scratches.
I've tried increasing the temperature, using more acid, using more manganese, cleaning the steel better-- nothing seems to help. Is it simply that different metals "take" the parkerizing better?
Thanks alotSam Hardy
artist - Phoenix, Arizona
Phosphated surfaces must be oil,wax or lacquer finished.Instead your solution you can use 20 gm tannic acid/15 ml phosphoric acid/0,8 lit water solution/ 0,2 lit pure alcohol(simple and cheap do it yourself rust converter). Hope it helps and good luck!Goran Budija
- Zagreb, Croatia
Thank you Goran
I've appreciated your responses on other threads too!
- Phoenix, Arizona