plating, anodizing, & finishing Q&As since 1989
What is the pretreatment for NiP coating on Al sheet by electroless method?
I am doing NiP coating on Al sheet(commercial grade). I pretreated the substrate in SnCl2 and in PdCl2 respectively. But I got the coating dark/and sometimes bright but with dark patches. Is there any post-treatment which I should do?Dhananjay Kumar
To plate electroless nickel on aluminum requires a zincate preplate step (double zincate is better). No need for palladium or tin, that's for plastics.Guillermo Marrufo
That and a alkaline pH EN strike will really reduce the problems.James Watts
I agree with Mr. Guillermo Marrufo. Double zincating is the recommended pretreatment for Al alloys before electroless plating.
T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)
Q, A, or Comment on THIS thread -or- Start a NEW Thread