 Corrosion
Test - Salt Spray
The surfaces of steel nails are electrogalvanized to prevent
corrosion due to atmospheric oxidation (rusting). This
coating is particulary important when nails are to be
used for external purposes and so the thickness of the
applied coat and hence the resistance to rusting must
be monitored constantly.
To determine corrosion resistances, electrogalvanized
nails are suspended in a mist of sodium chloride solution
maintained at 1 atmosphere pressure (see ASTM B117).
The apparatus used to perform this operation is known
as the salt spray chamber. From the time the nails enter
the chamber, they are checked constantly for the first
signs of corrosion. The time taken for rust to appear
is then checked against in-house or customer-specified
standards.
This is the definitive test for corrosion resistance.
Tests are performed on random samples selected from
each batch of electrogalvanized nails. |
