Questions tagged [metallurgy]

Chemical and physical characteristics of metals and alloys.

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6
votes
2answers
3k views

Obtaining 100% pure metal

While reading my book everywhere I found that 99.9% pure metal is obtained. Is it possible by any process that we get 100% pure metal on industrial level?
13
votes
4answers
2k views

Do there exist metals that are composed of molecules?

Most metals are composed of pure elements or are alloys (mixtures of pure elements.) Are there metals that are composed of one type of molecule that is metallically bonded together? The difference ...
21
votes
4answers
20k views

Why does mercury decolourise a gold ring?

I saw that a gold ring decolourised as it got in contact with mercury . Why does this happen ? Is there any way to reverse this?
7
votes
1answer
4k views

Reaction between alumina and aqueous sodium hydroxide, which one's right?

My chemistry textbook has a rather annoying irregularity. It cites two different reactions for the same set of reactants (aluminium oxide, sodium hydroxide and water) without the slightest mention of ...
5
votes
1answer
2k views

Gallium-induced structural failure of aluminium

I have seen youtube videos of people treating some aluminium object with liquid gallium and after letting it sit for a while, they are able to break up the aluminium into tiny little pieces with their ...
4
votes
5answers
33k views

Which has more metallic character: aluminium or magnesium?

Which element has more metallic character - aluminium or magnesium? I know that metallic character decreases along a period (from left to right) and increases down a group. Aluminium comes after ...
6
votes
2answers
2k views

Froth floatation process - why CuSO4 is activating floating character of ZnS?

I read the following : "In a mixture of $\ce{PbS}$, $\ce{ZnS}$ and $\ce{FeS2}$, each component is separated from each other in froth floatation process by using the reagents potassium ethyl ...
1
vote
0answers
261 views

How quickly will steel lose structural strength from a heat flash?

I want to know if a sustained jet fuel burn around steel has the ability to make the steel structurally unsound. It seems like any applied heat that effects steel will be a kind of "heat flash": a ...
10
votes
2answers
6k views

When is Serpeck's process preferred over Bayer's process?

Both these processes are used in concentration of bauxite. They use different reagents. Which is more commonly used (wikipedia says Bayer's) and why? When is one preferred over the other? Which is ...
10
votes
2answers
702 views

Brass Instrument: Dezincification or just scrubbed off?

I do own a brass instrument (a trombone). The lacquer is damaged. I asked how to deal with it here. Now I learned that the brass contains zinc, and there is a corrosion process called "...
7
votes
1answer
3k views

Does Gallium (liquid or solid) corrode all forms of brass?

I know that it corrodes copper, but does it do the same to all brass or bronze compositions?
3
votes
2answers
175 views

How do we determine if some metal will undergo passivation under suitable environment?

The passivity of certain metal fall in order: $\ce{Ti->Al->Cr->Be->Mo->Mg->Ni->Co->Fe->Mn->Zn->Cd->Sn->Pb->Cu}$ Can we predict the order of passivation ...
2
votes
0answers
51 views

Why will A atoms diffuse from β phase to α phase and B atoms from α phase to β phase?

At the initial compositions 1 and 2 of $α$ and $β$ respectively the chemical potentials of A and B atoms in each phase can be found by extrapolation of the tangents to the free energy curves at 1 and ...