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FASTENERS
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To accommodate the thickness of zinc when galvanizing threaded
components, extra clearance must be provided on the female threads. (Refer to Joining Galvanized Steel)
OVERLAPPING SURFACES
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Overlapping surfaces should be avoided as far as possible. Care must be
taken not to specify sealed articles for galvanizing. If overlaps are
completely sealed by welding there is a risk of explosion during
dipping due to increased pressure of any entrapped air. If overlaps are
not completely sealed there is a danger of cleaning fluid entering the
cavity and then weeping out and causing localised staining.
CASTING
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Castings must be grit blasted before galvanizing as embedded sand from
the casting process cannot be removed by conventional chemical
cleaning. When designing castings to be galvanized, features such as
sharp corners and deep recesses should be avoided as these may develop
excessive distortion and thermal stresses during hot dip galvanizing.
Large fillet radii and uniform section thickness are also desirable.
MOVABLE PARTS
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Adequate clearance on mating surfaces, such as hinges, should be
allowed if they are to move freely after galvanizing. An extra
clearance of at least 1mm is usually sufficient.
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