(Cad) is a bright silvery white metal deposit (as plated).
treatments for type II can be golden, iridescent, amber, black, olive
or clear. All enhance the corrosion resistance of the coating.
resistance is very good, especially with type II finish. The cadmium
is smooth, adherent, uniform in appearance, free from blisters,
nodules, burning, and other defects when examined visually without
Luster: Unless otherwise
the use of brightening agents in plating solution is prohibited on
with a specified heat treatment of 180 Ksi minimum tensile strength
40) and higher. Either a bright (not caused by brightening agents) or
luster shall be acceptable. Brighteners may be used with alloys listed
in paragraph 3.2.8 of the specification. Parts which have been
ground, cold formed, or cold straightened after heat treatment shall
stress relief bake in accordance with table I or Ia of the
prior to shot peening, cleaning or plating. All parts shall be baked
4 hours of plating as specified in tables I of this specification.
on Types II and III shall be done prior to application of supplementary
For Class 1 and 2 the
thickness requirement shall be met after the supplementary
Excellent for plating
steels that are to be used in conjunction with aluminum to prevent
should not be used
when an alternate process meets the performance requirements of this
Components; Automotive Components.
Type II: Supplementary chromate
Type II plating shall not show white corrosion products of cadmium,
or basis metal corrosion products at the end of 96 hours (20%) salt
exposure per following table:
period for white corrosion products (hours)
otherwise specified, chromate treatment required for Type II is
colored iridescent bronze to brown including olive drab, black and
treatment. Type III shall conform to Type I of TT-C-490. Type III is
as a paint base.
.0005" minimum thickness
.0003" minimum thickness,
additional thickness requirements are given in paragraph 3.3.1
2, of this specification.
.0002" minimum thickness.