Patent ID: 6080447
Filing Date: 2000-06-27
Classification: C23C,C23F,C25D

Abstract:
A method for metal plating aluminum to provide a metal coating having thermal retention of paramagnetic properties when metal plated with a paramagnetic metal coating comprising:contacting a cleaned and etched aluminum substrate for an effective time with an aqueous zincating composition to form a zincate coating on the aluminum substrate, the zincate composition comprising, in g/l:NaOH in an amount of about 50 to saturation;ZnO in an amount of about 5 to 50;Fe.sup.+3 in an amount of about 0.15 to 0.5;a chelator in an amount effective to chelate the Fe.sup.+3 ; andNaNO.sub.3 in an amount of about 0.01 to 10; andmetal plating the zincated aluminum substrate.