Environmentally friendly chromium plating system

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GRØN DYST 2014 Technical University of Denmark

Environmentally friendly chromium plating system
Paper
Author:A. Junker-Holst (DTU Mechanical Engineering, Technical University of Denmark, Denmark)
Date: 2014-06-27     Track: Main     Session: 1

This project presents a coating system comprising a non-toxic trivalent chromium, Cr(III), layer on top of an extremely corrosion resistant tin-nickel alloy coating with negligible nickel release. Between the coating and the substrate material (brass, steel, aluminium, plastics, etc.), a copper layer is deposited. Compared to present coatings, this system provides: - Elimination of Cr(VI) in production - No need for toxic mist suppressants (PFOS) and extensive precaution systems - No risk of nickel dermatitis from surface/skin contact - Reduced layer thickness → reduced material consumption and processing time - Reduced energy consumption in production - Improved corrosion resistance The coating is a greener, healthier and cheaper coating than the present alternative. Given the extensive use of chrome plating worldwide today, the positive effects are considerable.