Selective coating
The difference between conventional and selective coating is the fact that the electrolyte for selective coating is being brought to the component instead of the reverse.That means that a component specific reactor is needed which lags the part air- and water-tight. During that process, the working piece is connected to a direct-current source and acts as a cathode while coating.
Advantages and possibilities
- Process-security due to high automated operation procedures
- Reproducible since being standardised
- High deposition rate due to enormous convection
- Excellent coating-quality in regards to accuracy grade, regularity and appearance
- Ecological advantages, no spreading and emission due to a lagged reactor
- Especially suitable for partial coatings
Requirements on parts for selective coating
- Recurrent, identical work pieces due to high initial costs for component specific reactor.
- Round parts (diameter) are preferred since an optimal electro circulation is ensured.
Procedures for selective coating
In principle, all coatings could be done with the selective procedure but our experience are up to now limited to following metals:
- Silver
- electroless nickel (High- / Mid-Phos)
- electroless nickel-Bor
- Hard chrome