Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chemistry revision Topic 5: Metals, alloys and corrosion (Transition…
Chemistry revision Topic 5: Metals, alloys and corrosion
-
Alloys:
-
Used as pure metals are malleable as they have a regular arrangement of identical ions so the layers can slide over each other
Different elements have different sized atoms so when mixed, it will disrupt the layers making it harder for them to slide over each other
Of iron:
Pure iron is soft, malleable and rusts(corrodes) quickly
-
-
-
Stainless steel (chromium added, sometimes nickel)
Corrosion-resistant, hard
Cutlery, containers for corrosive substances
-
Types of Alloys:
-
-
Gold alloys
Zinc, copper and silver used to harden gold
-
-
-
Corrosion:
Metals corrode in presence of oxygen and water to form metal oxides(metal is oxidised as gains oxygen)
-
Preventing:
-
Creating a barrier:
-
Electroplating uses electrolysis used to coat a metal with a different metal that won't be corroded away
-
-
Electroplating:
-
-
-
Electrolyte is a solution containing the metal ions of the metal that is being plated onto the object
-
-