Letter 27040

YELLOW NICKEL [Serbia and Montenegro] 

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I am interested to learn about yellow nickel plating process.Thanks in advance who is able to let me know.

Redzep Musovic
ing.chemistry - Nis, Serbia, Serbia and Montenegro

Nickel tends to be 'yellow' in color compared to metals like silver or chrome, Professor. It can get more yellowish as it tarnishes over time. But this effect is faint, the nickel is still basically white and reflective, and a layman would not call it yellow. I have never heard of a 'yellow nickel plating process'.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

I got some semples from Sweden, for the door-window, for termo furnace that have plate nickel, and other plate over it which is yellow, the same as the brass or gold. The plate is not surfaced with lacquer. The yellow surface conducts electricity and it is constant colour. What do you think about it? What is the process? Thank you.

Redzep Musovic
ing.chemistry - Nis, Serbia, Serbia and Montenegro

Well, nickel is not the color of gold or brass. I am not particularly knowledgable of atomic physics, but I do understand that the color of metals is related to their electron energy levels, and that gold and copper are their special colors because of that.

So, in my estimation, there is either something on top of the nickel (zirconium nitride?) or it is not nickel, but some kind of alloy. Is it possible to apply a spectrometer to get some elemental analysis?

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

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