Abstract
Electron microscopy and X-ray methods were used to investigate the various stages of zincate treatment and electroless Ni-P deposition upon Al-Mg (4 wt.% Mg). It is shown that the roughening of the surface of the alloy during this treatment enhances the attachment of the Ni-P coating. No evidence was found within the sensitivity of the applied methods that new phases which could influence adhesion are formed during the annealing at 180 °C at the Al-(Ni-P) interface. It is proved that annealing affects the desorption of hydrogen included in the Ni-P layer durings its formation. Therefore annealing may be substituted by an adequate pause before the next coating is deposited.
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