Question about waveguides and some silver plated stuff

[goldsilverpro]

They're not going to just throw cadmium on something for kicks. They would have to have a technical reason for it. Cadmium was primarily used as a sacrificial coating to prevent steel from rusting, for nuts and bolts, etc. I've never heard of it being plated on electronic components and I would wager that it's never been used, as plating, on electronic components. I do, however, remember that we ran into some old CPU packages that used a Ni/Cd braze to seal bare kovar lids.

 

[qst42know]

They're not going to just throw cadmium on something for kicks. They would have to have a technical reason for it. Cadmium was primarily used as a sacrificial coating to prevent steel from rusting, for nuts and bolts, etc. I've never heard of it being plated on electronic components and I would wager that it's never been used, as plating, on electronic components. I do, however, remember that we ran into some old CPU packages that used a Ni/Cd braze to seal bare kovar lids.

Do you know a test for cadmium?

This transistor may well be a good candidate for corrosion protection, both the lid and legs are magnetic.

I can only point to the modern RoHS standard that specifically restricts the use of lead, mercury, and cadmium. I can't say with certainty where it was applied but it must have been in there somewhere.

These Regulations implement EU Directive 2002/95 which bans the placing on the EU market of new electrical and electronic equipment containing more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants.

 

[goldsilverpro]

Cadmium was never a cheap, common choice. The only reason it is cheap today is because it has fallen out of favor with the environmentalists. It used to be a lot more valuable than it is today - check the price history. Zinc is similar and it has always been the cheaper coating. Cad plated steel has always been of premium quality. Kovar doesn't rust. After all, it contains 46% Ni + Co. If Cd plating was used, documentation would surely exist on it - where is it? Why do you keep showing this meaningless photo of a TO5 that looks like it's been burned? Why are we arguing?