Components of electroless tin plating on piston

+++++++

One of my endusers is electroless tin plating on piston for 2/4 wheel vehicle. My enduser just gave me as follows: 1. Dosage of Sodium Stannate 80 g/liter, dip the pistons in the bath for 60 - 70 seconds, temperature of the bath is 80™Ž. My user want us to instruct how to use our Sodium Stannate including the components of the bath. Since my company is tin salts manufacturer, we have little knowledge of plating in details. Please help me on this subject.

Takao Matsui
Tin Salts Manufacturer - Osaka, Japan

+++++++

In my opinion, the honest attitude is the most helpfull to your customer. Tell him what you have told us, that you are not platers. He must find a professional plater for good quality and troublefree service. Of course, you can sell the plater your tin salts.

Guillermo Marrufo
Monterrey, NL, Mexico

+++++++

Gentleman,
Using sodium stannate for Plating on to Aluminium Pistons is called Immersion Tin coating and not electroless plating.
you have to use 5% of Tin salt in water at a temperature of 80 to 85 degree centigrade. Just immerse the pistons, you will find a coating of Tin in 2 minutes.Then rinse and dry.
But the free caustic content in the bath should never exceed 5.0 gram/litre. For this the Sodium stannate should contain less amount of sodium Hydroxide for good control over the bath solution. Or else Blisters will appear on plating due high caustic content.
Thankyou,

SHANKARANARAYANAN N
- Bengalooru, Karnataka, India