cad-plated stainless steel?

"Dan" schrieb im Newsbeitrag
...
El Maximo wrote:
....
Stick a magnet to the part and see if it sticks. Magnets don't stick to
stainless steel.
small neodym magnet sticks to stainless as well as to steel pins, can't tell
and difference. What is a recommended test for stainless (besids leaving it
outside half a year and watch rusting)?

oilsardine wrote:
"Dan" schrieb im Newsbeitrag
...
El Maximo wrote:
...
Stick a magnet to the part and see if it sticks. Magnets don't stick to
stainless steel.
small neodym magnet sticks to stainless as well as to steel pins, can't tell
and difference. What is a recommended test for stainless (besids leaving it
outside half a year and watch rusting)?


If a magnet sticks to it, then it is 4xx series stainless I expect. The
traditional homeshop or blacksmith test for various metals is the spark
test, but is not that useful unless you:

A) Frequently perform spark tests and can judge it by eye, which is only
developed by ...........
B) Making up a set of test coupons of various common metals with good
provenance that you can spark test and compare.

There are some tests that can be done with acids, but also take
familiarity, and don't think work as well with the 4xx series.

I think there are perfectly good reasons to cad plate stainless, but you
should verify on your own:

1) Reduce galvanic corrosion when using stainless with aluminum,
magnesium or cadmium plated parts.

2) Cadmium plating acts as a lubricant and will prevent galling which is
a problem with both aluminum and stainless.


Charles