# Tag Info

## Hot answers tagged metallurgy

Accepted

### Why isn't the American nickel magnetic?

There are many types of magnetic properties, including ferromagnetism, paramagnetism, diamagnetism, antiferromagnetism, ferrimagnetism, superparamagnetism, metamagnetism, spin glasses, and ...
• 11.6k

### Why does mercury decolourise a gold ring?

The grey colour is an amalgam of mercury and gold. Mercury forms amalgams with many other metals. Some are used as chemical reagents in laboratory chemistry as they have different properties than the ...
• 32.6k

### Is "stainless" a bulk or a surface property of stainless steel?

Let's divide the steel world into two classes: 1) rusting steel and 2) stainless steel. Rusting steel, in the presence of oxygen and moisture, will oxidize, forming hydrated iron oxides/hydroxides ...
• 12.6k
Accepted

### Will we ever run out of gold, silver, copper and other important conductors?

How long will these reserves last? Short answer: longer than you think and will outlast me, you, our children and our grandchildren. Possibly last forever. Long answer: This is a fairly complex ...
• 5,004

### Why isn't the American nickel magnetic?

None of the US coins are magnetic (ferromagnetic), except for the 1943 Lincoln penny (Steel Cents, made in steel and zinc to save copper for ammunition during wartime), which are considered magnetic. ...
• 35.4k
Accepted

### Is "stainless" a bulk or a surface property of stainless steel?

It is usually a bulk property though you would need to know exact regulations for your country to be certain. Stainless steel is steel (i.e. iron + a little bit of carbon) alloyed with another metal (...
• 2,874

### How do manufacturer remove oxygen from metal during melting?

They use flux, that's how. That is, an inert substance which melts easier than the metal and floats on top, preventing it from oxidation in the air. Common fluxes for aluminum seem to be based on ...
• 30k