5. Why does acids or salt speed up the
rate of rusting?
• With acids or salt, the concentration of ions
increases. This allows more ion movements
which will cause the iron to lose electrons
faster to form Iron(III) Oxide.
• This speeds up the rate of rusting
6. Prevention of rusting
• Rusting can be
prevented by
putting a barrier
around the metal
• Paint, oil, grease,
plastic coating and
electroplating can
be a barrier for the
metal
7.
8. Process of electroplating
1. Put the plating metal
at the anode
2. Put the metal to be
plated at the cathode.
3. Both the plating
metal and the metal
would be placed into
the electrolyte
9. Common metals used for plating
objects
• Tin
• Silver
• Nickel
• Chromium
• Zinc
• Gold
10. • Tin is commonly used to coat food
containers
• Iron rusts faster when the tin metal coating
is damaged because iron is more reactive
than tin, therefore, the iron lose electrons
faster to form ions which cause rusting to
occur faster
