| |
|
|
| Zinc
Coating |
Damage |
Corrosion Start |
 |
| When
discontinuity or damage in the zinc coating
exposes the underlying steel, the cathodic
protection which zinc provides for steel comes
into action and ensure that the exposed steel
does not corrode. |
| Paint
Coating |
Damage |
Corrosion Start |
 |
| Most
organic coatings and paint films depend on their
sealing ability and in some cases anti-corrosive
inhibitive pigments to protect steel from
corrosion. They offer little or no protection to
bare steel exposed by failure, damage or
discontinuity in the coating film. Corrosion
starts and spreads rapidly beneath the coating. |
