Many steel parts are being
galvanized in order to increase their resistance to corrosive
factors such as air and moisture.
Galvanization is coating a metal
with a layer of zinc as a protective coating. The zinc layer in a
galvanized steel will protect the steel from rust and corrosion,
that's why the thickness of this layer is important.
Manufacturers often need to test a galvanized metal to ensure
sufficient amount of zinc is protecting the under laying metal.