a metal with a higher reactivity will displace a less reactive metal in a salt solution.
extraction of metals
extraction by electrolysis - K Na Ca Mg
Extraction by carbon - zn, iron, led hydrogen,copper
rust prevention
oiling, electroplating with a layer of non corrosive metals such as tin silver or aluminium.
galvanizing
galvanizing
sacrificing a more reactive metal to prevent iron or steel from being corroded as the mor ereactive netal is oxidied/corrode in placenof it.
galvanisng - coat a thin layer of zinc on the surface of iron or steel to keep out air and moisture, by ensuring that zinc itself gets oxidised andnprevents the iron or steel from oxidation process
sacrfical protection
attach blocks of magnesium or zinc to ships steel hl to prevent corrosion
