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topic 3171

Platinum Plating with P-salt


In an effort to create a very specialized Platinum Plating bath I have been searching for Platinum Diamino Dinitrite. My question is this: Is platinum Diamino Dinitrite the Platinum "P-Salt"? What is the chemical formula for "P-salt" I thank you in advance for any help obtained here.

Anthony J. Covey
electroformer - Corona, California

Michael Muphy, editor of Metal Finishing magazine looked this up for us. It's dinitro-diamine-platinum.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Platinum 'P' Salt is the diammine dinitro Platinum, Pt(NH3)2(NO2)2. It is conveniently mixed in solution with ammonia or ammonium compounds. Use neither ammonium nitrate (potential explosion! when dried [cf. ANFO]) nor ammonium sulfamate, as that is Technic's formulation. Check this out:

cis-Diammineplatinum(II) nitrite [14286-02-3] H6N4O4Pt

[(H3N)2Pt][NO2]2 Reference(s) 1. Brauer, 1965, Vol. 2, 1560 2. Holifield, P. J., private comm., 1974 3. Fountain, N. O., private comm., 1983

Hazard It decomposes explosively at 200°C [1]. Dry material stored in clear bottles in sunlight for several weeks became sensitive and exploded violently on slight mechanical shock. The material is now supplied commercially moistened with water [2]. The dry salt may be readily ignited, and deflagration under confinement is similar to that of gunpowder. Presence of 10% of water reduced ignitability but did not slow the deflagration rate thereafter. Sensitivity to impact or friction was greater than that of nitrobenzene [3].

Steve Koelzer
- Sunnyvale, California


Thanks for your long-lasting support to us, as a patronage. We are expecting the same in the future too. Kindly clarify the following:

We are a manufacturer of platinised titanium anodes. With our past experience, we like to step forward our activities to the process of platinum plating on NIOBIUM. However, we are interested to know about the procedure of pre treatment (surface preparation, etching, surface cleaning) of niobium mesh and sheet, before plating.

For titanium, we conduct the following pre treatment (surface preparation):

1. Shot Blasting

2. Etching with HCl mix.

3. Cleaning with DM water.

Like the above procedure, we want to do the surface preparation of niobium. Kindly advise us the procedure please.


- Chennai, India


Dear Friends:

I tried to coat Ni-base superalloy samples with Pt by using P-salt solution. My parameters: Temperature--90 degree C; Current: 2A/dm square; (the voltage will be automatically set, it was 2.30V).

However, I found some black matts on Pt coated surface (the black matte can be removed easily by using compressed air), the Pt coating color is semi-bright (instead of bright). The black matt is mainly Pt.

Could somebody here tell me why? Could you please provide me with a set of good parameters for this? Thanks.

Yongqing Wang
coatings process engineer - Minneapolis, Minnesota

November 21, 2012 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I am using p-salt to plate titanium and I am aiming at 5.5 - 6.5 gms/per unit. If I could control the process to guarantee 5.5 gms/unit the savings would be worth an equipment upgrade. At the start of the working day the cycle time is 40 mins but by the end of the day it is up to 70 mins.
Qu.: 1) How can I constantly hit 5.5 gms/ unit? and 2) is there a way of constantly monitoring the solution and automatically adjusting the strength to enable me to plate more units per day?

Any suggestions?



Keith Martin
plating shop employee - Canterbury, Kent, England

November 26, 2012

A. Hi Keith. We appended your inquiry to a thread about platinum plating of titanium. Just to be clear: that is what you are inquiring about?


Ted Mooney,
Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

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