Effect of surface structure on contact resistance measurements of electrodeposits.

It has been demonstrated in earlier work with gray Ni/P deposits and in this work with gray nickel deposits that it is paramount that these base metal deposits have a multitudinous number of tightly spaced asperities of relatively uniform height to maintain low contact resistance (C.R.). These asperities can appear on a microscopic scale (5000X) to be acicular (star- like) or gritty (sand-like), but low C.R. will be maintained as long as they are tightly spaced and of relatively uniform size.