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ASTM B480-88(2006)

(Guide)

Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating

Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating

SIGNIFICANCE AND USE
Metals are electroplated on magnesium for various purposes: solderability, RF grounding, hermetic sealing, wear resistance, corrosion resistance, appearance, and electrical conductivity, for example. Because magnesium is covered with a naturally occurring oxide film, usual procedures for the preparation of metals for autocatalytic or electrolytic plating cannot be used.
SCOPE
1.1 This guide describes two processes used for plating on magnesium and magnesium alloys: direct electroless nickel plating and zinc immersion. Some users report that the direct electroless nickel procedure does not produce quite as high a level of adhesion as zinc immersion.
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.  For specific hazard statements, see .

General Information

Status
Historical
Publication Date
31-Mar-2006
ICS
25.220.10 - Surface preparation
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.02 - Pre Treatment
Current Stage
Ref Project

Relations

Replaces
ASTM B480-88(2001) - Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating
Effective Date
01-Apr-2006
Replaced By
ASTM B480-88(2010) - Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating
Effective Date
01-Nov-2010
Referred By
ASTM B689-97(2023) - Standard Specification for Electroplated Engineering Nickel Coatings
Effective Date
01-Apr-2006
Referred By
ASTM B905-00(2021) - Standard Test Methods for Assessing the Adhesion of Metallic and Inorganic Coatings by the Mechanized Tape Test
Effective Date
01-Apr-2006

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ASTM B480-88(2006) - Standard Guide for Preparation of Magnesium and Magnesium Alloys for ElectroplatingASTM B480-88(2006) - Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating
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ASTM B480-88(2006) - Standard Guide for Preparation of Magnesium and Magnesium Alloys for Electroplating
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B480–88(Reapproved 2006)
Standard Guide for
Preparation of Magnesium and Magnesium Alloys for
1
Electroplating
This standard is issued under the fixed designation B480; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
Hydrofluoric acid (HF) 70 mass %, density 1.258 g/L
Phosphoric acid (H PO ) 85 mass %, density 1.689 g/L
3 4
1.1 This guide describes two processes used for plating on
4.2 Purity of Water—All water used for solutions, whether
magnesium and magnesium alloys: direct electroless nickel
plating and zinc immersion. Some users report that the direct new or recycled, should be monitored for cations, anions, and
organic matter that are known to interfere with the plating
electroless nickel procedure does not produce quite as high a
level of adhesion as zinc immersion. process.
1.2 This standard does not purport to address all of the
5. Processes
safety concerns, if any, associated with its use. It is the
5.1 Procedures:
responsibility of the user of this standard to establish appro-
5.1.1 Wheel polish and buff parts for smooth, highly pol-
priate safety and health practices and determine the applica-
ished surfaces.Tumble and burnish small parts.Acid pickle the
bility of regulatory limitations prior to use. For specific hazard
parts after use of wire brushing or steel wool. (Warning—
statements, see 5.1.1 and 5.2.9.2.
Because of the high flammability of powdered magnesium,
2. Referenced Documents
special precautions against fire are important. Polishing and
2
buffing lathes should be kept scrupulously clean. Dust from
2.1 ASTM Standards:
grinding in and around lathes should be swept up and placed in
B322 Guide for Cleaning Metals Prior to Electroplating
closed containers for proper disposal. Exhaust systems should
3. Significance and Use
be cleaned frequently and the residues handled similarly. If
abrasives are used in tumble finishing, similar precautionary
3.1 Metals are electroplated on magnesium for various
purposes: solderability, RF grounding, hermetic sealing, wear techniques should be used for the solids from the abrasive
resistance, corrosion resistance, appearance, and electrical slurry.)
conductivity,forexample.Becausemagnesiumiscoveredwith 5.1.2 Chemical—Remove oil and grease in an alkaline soak
a naturally occurring oxide film, usual procedures for the cleaner. Remove other soils and coatings in suitable acid
preparation of metals for autocatalytic or electrolytic plating pickling solutions.
cannot be used.
NOTE 1—General information on the cleaning of metals is given in
Practice B322.
4. Reagents
5.2 General Electroplating Procedure:
4.1 Purity of Reagents—All acids and chemicals used in
5.2.1 Remove oil, grease, and other soils left from preplat-
this guide are of technical grade. Acid and base solutions are
ing procedures by soak cleaning in an alkaline cleaner suitable
based on the following assay materials:
for magnesium.
Ammonium hydroxide (NH OH) 30 mass %, density 0.895 g/L
4
5.2.2 Rinse in cold water.
Nitric acid (HNO ) 67 mass %, density 1.16 g/L
3
Sulfuric acid (H SO ) 93 mass %, density 1.40 g/L
2 4
NOTE 2—As generally used in rinsing terminology, cold water refers to
water from an unheated water supply as opposed to heated water used for
drying or other purposes. In some areas, particularly in water, ambient
1
This guide is under the jurisdiction of ASTM Committee B08 on Metallic and water temperatures may be too low for effective rinsing. In those
Inorganic Coatings and is the direct responsibility of Subcommittee B08.02 on Pre
instances, the rinse water may need to be heated.Aminimum temperature
Treatment.
of 16°C is recommended for effective rinsing.
Current edition approved April 1, 2006. Published April 2006. Originally
5.2.3 Electroclean parts in an alkaline electrocleaner suit-
approved in 1968. Last previous edition approved in 2001 as B480 – 88 (2001).
DOI: 10.1520/B0480-88R06.
ableformagnesium.Makethemagnesiumcathodicat7.5to13
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 2
A/dm and 85°C.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2.4 Rinse in cold water.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.2.5 Pickle in one of the following solutions:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B480–88 (2006)
3
5.2.5.1 Ferric Nitrate Pickle: 5.2.10 Rinse thoroughly in cold water.
Chromic acid (CrO ) 180 g/L
...

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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 surfaces. Nickel plus chromium or copper plus nickel plus chromium is used in decorative applications. Nickel plus brass plus lacquer or copper plus nickel plus brass plus lacquer is also used for decorative finishes, sometimes with the brass oxidized and relieved in various ways.  
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3.1 Metals are electroplated on magnesium for various purposes: solderability, RF grounding, hermetic sealing, wear resistance, corrosion resistance, appearance, and electrical conductivity, for example. Because magnesium is covered with a naturally occurring oxide film, usual procedures for the preparation of metals for autocatalytic or electrolytic plating cannot be used.
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Standard Guide for Preparation of Aluminum Alloys for Electroplating

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 surfaces. Nickel plus chromium or copper plus nickel plus chromium is used in decorative applications. Nickel plus brass plus lacquer or copper plus nickel plus brass plus lacquer is also used for decorative finishes, sometimes with the brass oxidized and relieved in various ways.  
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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 glycolate 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 approximately equivalent with respect to adherence. Corrosion performance is affected by many factors, however, including the procedure used to prepare the aluminum alloy for electroplating.  
1.4 This guide is intended to aid electroplaters in preparing aluminum and its alloys for electroplating.  
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see Section 7 and Appendix X1.  
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