Semi-shiny electrolytic tinning (alcaline bath)
process and advantages of alcaline electrolytic stagnation
A conductive matherial dipped in a proper solution could give rise to insoluble tin-electrodepositions’ products because of the transformation of the electric work of the equipment to a chemical work.
All the electrolytical processes may cause the deposition of the insoluble film that suit the metallic-surface in order to protect it and improve some chemical and physical details.
Compared to a surface-converting reaction, the superficial metal does not react chemically but is simply protected (catodic protection) by a less noble metal that can be easily early oxidized: in this case tin acts as a sacrificial anode.
The tin coating is often preferred to other metal-surface treatments because of the great electrical caracteristic of the tin and of the really good anticorrosion resistance (salt-fog test).
In order to obtain a perfect performance of the treatment, the substrates’ surface has to be prior prepared through the parameters described as follow, furthermore the already processed item can be easily improved as chemical and physical characteristics by a proper sealing step.
The alcaline-tin coating is suitable to all metals and alloys that presents electic-conductivity properties. In particular on bolts, nuts, odds and ends and small items up to 3,5 metres long.
The present procedure is performed with respect to the norm UNI-ISO 2093/90. The maximum dimension of the items can be 3500x1200x800 mm.
Semi-shiny electrolytic tinning plating plant
One automatic plant equipped with jigs to deposit the Alcaline semi-shiny electrolytic tin on the metal surfaces.
Tanks dimensions: 3,50×1,20×0,80 meters.
Tin cover thickness from 3 up to 20 microns.
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