ASTM B253.pdf
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Designation: B 253 – 87 (Reapproved 2005)
e1
Standard Guide for
Preparation of Aluminum Alloys for Electroplating
1
This standard is issued under the fixed designation B 253; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
e
1
NOTE—The Warning notes in 7.1 and X1.8 were updated in October 2005.
1. Scope
1.1 This guide covers cleaning and conditioning treatments
used before metal deposition (Section
5), and immersion
deposit/strike procedures (Section
6) that enhance the adhesion
of metals that are subsequently applied to aluminum products
by electrodeposition or by autocatalytic chemical reduction.
1.2 The following immersion deposit/strike procedures are
covered:
1.2.1 Zinc immersion with optional copper strike (
6.3).
1.2.2 Zinc immersion with neutral nickel strike (6.4).
1.2.3 Zinc immersion with acetate-buffered, nickel glyco-
late strike (
6.5).
1.2.4 Zinc immersion with acid or alkaline electroless
nickel strike.
1.2.5 Tin immersion with bronze strike (
6.6).
1.3 From the processing point of view, these procedures are
expected to give deposits on aluminum alloys that are approxi-
mately equivalent with respect to adherence. Corrosion perfor-
mance is affected by many factors, however, including the
procedure used to prepare the aluminum alloy for electroplat-
ing.
1.4 This guide is intended to aid electroplaters in preparing
aluminum and its alloys for electroplating.
1.5 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific
precautionary statements see Section
7 and Appendix.
2. Referenced Documents
2.1 ASTM Standards:
2
B85 Specification for Aluminum-Alloy Die Castings
B 179 Specification for Aluminum Alloys in Ingot and
Molten Forms for Castings from All Casting Processes
B 209 Specification for Aluminum and Aluminum-Alloy
Sheet and Plate
B 209M Specification for Aluminum and Aluminum-Alloy
Sheet and Plate [Metric]
B 221 Specification for Aluminum and Aluminum-Alloy
Extruded Bars, Rods, Wire, Profiles, and Tubes
B 221M Specification for Aluminum and Aluminum-Alloy
Extruded Bars, Rods, Wire, Profiles, and Tubes [Metric]
B 322 Guide for Cleaning Metals Prior to Electroplating
B 431 Practice for Processing of Mandrels for Electroform-
ing
3
E 527 Practice for Numbering Metals and Alloys (UNS)
3. Significance and Use
3.1 Various metals are deposited on aluminum alloys to
obtain a decorative or engineering finish. The electroplates
applied are usually chromium, nickel, copper, brass, silver, tin,
lead, cadmium, zinc, gold, and combinations of these. Silver,
tin, or gold is applied to electrical equipment to decrease
contact resistance or to improve surface conductivity; brass,
copper, nickel, or tin for assembly by soft soldering; chromium
to reduce friction and obtain increased resistance to wear; zinc
for threaded parts where organic lubricants are not permissible;
tin or lead is frequently employed to reduce friction on bearing
1
This guide is under the jurisdiction of ASTM Committee B08 on Metallic and
Inorganic Coatings and is the direct responsibility of Subcommittee B08.02 on Pre
Treatment.
Current edition approved Sept. 15, 2005. Published October 2005. Originally
approved in 1951. Last previous edition approved in 1999 as B 253 – 87 (1999)
e1
.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Withdrawn.
1
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