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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Manganese phosphate coating on stainless steel
Q. We would like to know for the manganese phosphate coating activity, we have the some material, i.e., sus 304, sus 316 & sus 420. ( this is the small quantity ) and we need to do the Manganese phosphate coating ( after finish job is black colour )
Can you please or :
1) For these stainless steel material can do it this coating ?
2) If can, can you please explain to us the step by step for this job.
What can we do, what is the chemical suppose to mix, how to boil and etc.
Thanks
Zamri
- KUANTAN, PAHANG, MALAYSIA
September 5, 2008
A. Manganese Phosphate coatings will NOT form on ANY stainless alloy.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
A. Phosphate on any SS is a bit unusual. You need to talk to top quality vendors about their products that will do the job. Home brew is not a good idea until you have experience with quality products. If you consider the cost of reworks, and no tech service, I would personally stay with a proprietary product.
James Watts- Navarre, Florida
Q. Hello,
One of our customer requirement is of Manganese Phosphate on CF3M SS316 L casting up to 10 microns as per DOD-P-16232-F [ed. note: replaced by MIL-DTL-16232 [from
DLA]
],Type M,Class-2.
CF3M Composition is as follows;
C 0.03
Mn 1.5
Si 1.5
P 0.04
S 0.04
Ni 9-13
Cr 17-21
Mo 2-3
Sir, Is it possible to make the surface passive?
- Pune, Maharashtra, India
July 30, 2013
A. Hi Rajendra,
It is possible to manganese phosphate stainless steels, but it needs a specialist brew that you will not be able to self formulate. You need to talk to your proprietary chemical vendors about suitable products.
I will say that phosphate coatings are not controlled by thickness due to the difficulties with measuring a highly crystalline coating with any form of accuracy. Coatings are controlled by coating weight, which is also the requirement of MIL-DTL-16232 [from
DLA]
. Phosphate coatings on stainless and corrosion resisting steels tend to be very thin and are usually used as a key for other supplementary coatings.
Aerospace - Yeovil, Somerset, UK
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