alloys and metalic bonding

Question 1

what is metallic bonding?

Answer 1

electrostatic attraction between metal ions and the de-localised electrons that surround them. It is like a ‘sea of electrons’ around the metal ions which are arranged in a lattice structure.

Question 2

properties of stainless steel (alloys)

Answer 2

Iron, with 18% chromium, a 8% nickel

Chromium reacts with oxygen in the air to create a protective layer to make the mixture stainless, high corrosion resistant and rust resistant

i.e: making cutlery, cooking items and medical tools

Question 3

properties of mild steel (alloys)

Answer 3

Mild steel is an Iron (Fe) alloy with the addition of small amounts of carbon

• Different grades of mild steel are defined by their differing levels of carbon.
• A magnetic metal due to its ferrite content
• Good malleability with cold-forming possibilities

i.e: wire, fencing, furniture, nails, automobiles

Question 4

properties of brass (alloys)

Answer 4

70% copper and 30% zinc

• Susceptible to cracking

I.e: musical instruments, door locks, coins

Question 5

properties of bronze (alloys)