[QQ-S-365D]
.0005" minimum
thickness unless otherwise
specified. White matte to very bright in appearance. Good corrosion
resistance,
depending on base metal. Will tarnish easily. Hardness varies from
about
90 Brinnell to about 135 Brinnell depending on process and plating
conditions.
Solderability is excellent, but deteriorates with age.
Excellent
electrical conductor. Has
excellent lubricity and smear characteristics for anti-galling uses on
static seals, bushing, etc. Stress relieve steel parts at a minimum
375°F
±25°F or more prior to cleaning and plating if they contain
or are suspected of having damaging residual tensile stresses.
Embrittlement
relieve all steel parts Rc 40 and above at 375°F ±25°F
for
3 hours within 4 hours of plating. Increasing use in both decorative
and
engineering fields, including electrical and electronic fields.
Type I:
Matte.
Type II: Semi-bright.
Type III: Bright.
Grade A:
Chromate post-treatment
to improve tarnish resistance.
Grade B: No supplementary treatment.
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