The corrosion resistance of zinc
can be enhanced by a post plating dip called
process applies a thin coating onto the surface of the zinc.
Additional coatings can be added to
further improve the salt spray performance or to modify the lubricity of the
component or fastener by the addition of top coat torque modifiers. These are
available in a range of values to suit the majority of automotive
specifications from 0.008µm.
YTS AB offers WHITE, YELLOW,
BLACK AND BLUE passivation.
•Yellow Zinc — This type of zinc coating is
commonly used in the automotive industry and offers an average level of
protection against corrosion.
•Black Zinc — Black zinc coatings are available
as a black oxide that can actually be olive-drab in color, or as a pure black
coating. The former will normally provide slightly better corrosion resistance.
•Clear or Blue Zinc — This coating formulation tends to
offer fewer amounts of corrosion protection, although it’s regarded as being
more environmentally friendly.