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 The corrosion resistance of galvanized sheet is a linear
function of the thickness of the zinc coating. Thus, increasing the
life of a product can be achieved by increasing the thickness of
the zinc coating. There are some practical limits to the coating
thickness that need to be considered. As the coating thickness is
increased, there is a greater tendency to experience loss of
coating adhesion during forming, the spot weldability is decreased,
and the surface finish is less smooth.
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| U.
S. Steel Galvanized Sheet is produced for applications where
corrosion resistance is an important service requirement. These
applications include air conditioning equipment; automotive parts
including body panels and structural members; building panels;
display cases; electrical boxes; electronic equipment; farm
buildings; equipment and machinery; garbage cans; guide rails;
heating equipment; furnace parts and ductwork; home laundry
appliances; lighting fixtures; mailboxes; outdoor signs, playground
equipment; prefabricated buildings; refrigerators and freezers;
roofing; toolboxes; vending machines; and wall panels. In all of
these applications, the galvanized coating is specified because it
provides enhanced corrosion resistance, and thus, lengthens the
useful life of the manufactured products. |
| For applications that involve high temperature exposure
of the fabricated product such as fireplace parts, galvanized steel
sheet should be applied with caution. The service temperature
should not be over approximately 500o F. At
500oF and higher, the coating tends to deteriorate over
a long period, and the zinc may alloy with the base metal causing
embrittlement and mechanical failure of a structural part.
Galvanized sheet is designed to provide long service at moderate
temperatures. |
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