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7. Electrolytic metallization
After electroless plating, the parts are generally subjected to electrolytic treatment in a pre-copper or pre-nickel plating bath. Waiting too long between the electroless bath and the first bath of the electrolytic line, or handling the parts, can lead to passivity of the deposit. This must be avoided at all costs to ensure good adhesion between the electroless nickel deposit and the electrolytic deposit. The purpose of these pre-copper or pre-nickel plating baths is to reinforce the thickness of the conductive layer on the surface of the non-conductive material. Deposition is initiated at low current density to avoid burning at contact points. After a few minutes, the current density is increased to create a sufficient thickness of metal to withstand the current densities of successive baths. This deposit, 1 to 2 µm thick, is then covered with a 10 to 40 µm-thick electrolytic deposit...
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Electrolytic metallization
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Bibliography
Standards
- Standard practice for qualitative adhesion testing of metallic coatings. - ASTM B 571-97 - (1997)
- Metallic coatings – Electroplated coatings of nickel plus chromium on plastics materials. - UNI ISO 4525 - (2003)
- Peel Strength of metal Electroplated Plastics. - ASTM B 533-85 - (2004)
Regulations
SEVESO II: Directive 96/82/EC on the control of major-accident hazards involving dangerous substances.
Fiches toxicologiques INRS n° 1 – édition 2007 : Le trioxyde chrome, Cahiers de notes documentaires n° 130, 1 er trimestre 1988.
Arrêté du 30.06.2006 relatif aux ateliers de traitement de surface (JO du 5 septembre 2006)....
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