Chromium Electroplating of Aluminium Alloys Using Electroless Nickel as Underlayer

Abstract

The growing demand for chromium coated aluminium components especially for the automotive industry is due to their favourable physical properties (density, strength to weight ratio etc.). However, their frequent use under harsh environmental conditions renders them corrosion sensitive and consequently they need to be protected. An approach that has been applied in industry is to directly electroplate nickel onto aluminium substrate prior to a top metallic finish; however, in components with complex geometry, certain areas could become exposed to corrosion attack due to poor surface coverage during plating. In this study, a modified electroless nickel undercoat was applied to pre-treated aluminium alloys prior to duplex nickel and chromium plating with a view to enhance corrosion resistance, improve coating adherence and durability, and overall, to achieve substrate protection. Hexavalent and trivalent chromium were applied to pre-treated Al 1050 and Al 6061 following electroless nickel deposition, and plating performance was assessed by surface and corrosion techniques, while durability was measured by scratch, adhesion and hardness tests. Overall, while chromium plating with an electroless nickel undercoat did not improve corrosion resistance or hardness of the materials, it provided an additional protective layer for the substrate with a potential for longer term durability.

Electroplating on Al6082 Aluminium: A New Green and Sustainable Approach

“…Thanks to the pre-treatment, a thin layer of zinc was deposited onto the aluminium surface [40][41][42]. Nevertheless, to ensure better adhesion between layers, a double zincate step was preferred despite the fact that the literature is still controversial with regards to this point [41,[43][44][45][46]. Therefore, by again rinsing with water in between each step, the zincate sample was soaked in 30 wt% HNO 3 solution for 45 s (room temperature) and a new layer of zinc was deposited by means of the cyanide-free zincate solution (45 s at room temperature).…”