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ASTM B 545 Document Information:
Title
Standard Specification for Electrodeposited Coatings of Tin
ASTM International
Publication Date:
Oct 10, 1997
Scope:
This specification covers the requirements for electrode-posited
(electroplated) coatings of tin
applied to metallic articles. Tin coatings are used to provide a low
contact-resistance surface, to
protect against corrosion (see 1.2), to facilitate soldering, to
provide anti-galling properties,
and to be a stopoff coating in the nitriding of high-strength steels.
Some corrosion can be expected from tin coatings exposed outdoors. In
normal indoor exposure, tin
is protective on iron, steel, nickel, copper, and their alloys.
Corrosion can be expected at
discontinuities in the coating (such as pores) due to galvanic couples
formed between the tin and
the underlying metal through the discontinuities, especially in humid
atmospheres. Porosity
increases as the coating thickness decreases, so that minimum
thicknesses must be specified for
each application. Parts coated with tin can be assembled safely in
contact with iron and steel,
tin-coated aluminum, yellow chromated zinc, cadmium, and solder
coatings. (See X5.2 for oxidation
and corrosion properties.)
This specification applies to electroplated coatings of not less than
99 % tin (except where
deliberately alloyed for special purposes, as stated in X6.3) obtained
from any of the available
tin electroplating processes (see 4.3).
This specification does not apply to hot-dipped tin or other
non-electrodeposited coating; it also
does not apply to mill products. For mill products, refer to
Specifications A 623 or A 623M.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- electrodeposited tin
- electroplated tin
- tin
- tin coatings
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