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Coumarin in Nickel Watts Bath Solution

I tried to add coumarin & saccharin to Watts Bath Nickel Solution, I faced problem of them. What is an effective way to mix them?

Rio Simbolon
- Jakarta, DKI JAKARTA, Indonesia

What sort of problems?

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2005

2005

I boiled coumarin in aquades, first it dilluted but after I filled this solution in to fresh watts bath solution, coumarin solidified as first. any ideas?

Rio Simbolon
- JAKARTA
2005

Coumarin is only very slightly soluble in water (0.25g/100ml), so when you added the hot solution to the cold watts nickel, you exceeded the solublity limit in the cooler solution.

Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK

My friend Rio Simbiolon

Using coumarin these days in Nickel plating is not a good idea. It causes the formation of Meliotic acid on breakdown and this causes plating defects. Coumarin went out with the advent of newer additives for Nickel Brightener formulation.

It is possible to obtain these pre blended additives for Nickel brightener blending if commercial activity is your eventual direction.

Regards

Asif Nurie [deceased] [deceased]
- New Delhi, India
With deep sadness we acknowledge the passing of Asif on Jan 24, 2016

Try dissolving coumarin in ethyl alcohol.

Jeffrey Holmes, CEF
Spartanburg, South Carolina

Cumarin is out for many years. It is unstable and has a terrible smell of toxic vapor.

Sara Michaeli
Tel-Aviv-Yafo, Israel

Dear Rio,

Based on my knowledge in nickel plating field for years, coumarine only being used in semi-bright Nickel system and Saccharine only being used in Bright Nickel system. What kind of system that you are going to test or use ?

Best regards,

Tony L. Chandra
- Jakarta, DKI Jaya, Indonesia
2005

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