Tiggy_dorset
It looks just like a bought one!
- Messages
- 1,970
- Location
- Weymouth, Dorset, UK
For pickling coppeer and brass I use a Sodium Bisulphate solution. Normally items come out pretty good and need a small scrub to bring up a shine. On this occasion I did something different, I used an aluminium sieve to contain the part for pickling.
I have used the solution for copper, so there is a weak element of copper within the solution which hasnt caused an issue previously. The items in the pic have been done in the same solution on the same day.
The item on the left was dipped with the aluminuim sieve. Item on the right is normal dipped.
It seems to me that the aluminium has created an anode/cathode connection with the brass and created a plating reaction sucking the copper out of the solution. The fitting is now copper plated and take a hell of a lotta scrubbing to get off.
I guess there are some chemistry boffs out there who can shed more light on the subject. I found it interesting to know for future reference
I have used the solution for copper, so there is a weak element of copper within the solution which hasnt caused an issue previously. The items in the pic have been done in the same solution on the same day.
The item on the left was dipped with the aluminuim sieve. Item on the right is normal dipped.
It seems to me that the aluminium has created an anode/cathode connection with the brass and created a plating reaction sucking the copper out of the solution. The fitting is now copper plated and take a hell of a lotta scrubbing to get off.
I guess there are some chemistry boffs out there who can shed more light on the subject. I found it interesting to know for future reference
