Manganese Phosphate coating presence
Manganese Phosphate coating presence
(OP)
Hello all,
I am looking for a chemical test which will help me to detect the presence or absence of Manganese phosphate coating on steel part.
Your feedback please.
Thanks
smurali1
I am looking for a chemical test which will help me to detect the presence or absence of Manganese phosphate coating on steel part.
Your feedback please.
Thanks
smurali1





RE: Manganese Phosphate coating presence
Concentrated hydrochloric acid will remove manganese phosphate. So, put a drop of HCl on your unknown piece. If there is no change, it was uncoated steel. If you wipe away the drop area and it is lighter than it was, you removed the phosphate coating.
RE: Manganese Phosphate coating presence
RE: Manganese Phosphate coating presence
RE: Manganese Phosphate coating presence
If it is the first case, then the visual process or the chemical process CoryPad mentioned will work.
The second case is a bit more complex. While I am sure there are spot tests for manganese phosphate, I am not aware of any specific ones.
If I were given the problem, I'd control the process and verify coating immediately after it was applied. It the part comes out of a manganese phosphating bath, and is covered with an acceptable coating, you can be pretty sure is has a manganese phosphate coating on it.
rp
RE: Manganese Phosphate coating presence
Thanks for the feedback.
The case is of first type i.e. to check presence of Manganese Phosphate or no coat.
Let me explain some more background:
We assemble Manganese Phosphate coated part with slight interference on to a shaft. We see some powders (presumably Mn Phosphate) coming out during assembly process.
So, we dis-assembled one pc to check if all of the Mn phosphate has been removed (bare steel is exposed) or still some amount of coating is remaining on the part.
Thanks,
SPM
RE: Manganese Phosphate coating presence
RE: Manganese Phosphate coating presence
David Benson
Benson's Mobile Welding & Fabrication
www.bensonmobilewelding.com