ASTM B630-88(2017)
(Practice)Standard Practice for Preparation of Chromium for Electroplating with Chromium
Standard Practice for Preparation of Chromium for Electroplating with Chromium
SIGNIFICANCE AND USE
3.1 Electrodeposits of chromium on chromium are produced in cases where it is desired to obtain a better performing coating, to reclaim plated parts that are defective, or restore worn chromium coatings to original dimensions.
SCOPE
1.1 This practice is intended to serve as a process guide (not as a standard procedure) for producing adherent electrodeposits of chromium on chromium for engineering use.
1.2 Only well-known, generally practical methods using hexavalent chromium plating baths have been included. Some of the newer proprietary chromium plating processes produce chromium plating for which this process is unsuitable. Suppliers of the processes should be consulted.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: B630 − 88 (Reapproved 2017)
Standard Practice for
Preparation of Chromium for Electroplating with Chromium
This standard is issued under the fixed designation B630; 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 4. Preparation of Surface
1.1 This practice is intended to serve as a process guide (not 4.1 Surface Finishing—The smoothness of the chromium
asastandardprocedure)forproducingadherentelectrodeposits coating before electroplating with chromium should closely
of chromium on chromium for engineering use. approximate the requirements of the finished part. It is usually
achieved by appropriate grinding with a diamond wheel.
1.2 Only well-known, generally practical methods using
hexavalent chromium plating baths have been included. Some 4.2 Stripping and Basis Metal—With previously electro-
of the newer proprietary chromium plating processes produce plated parts where the chromium deposit has been worn
chromium plating for which this process is unsuitable. Suppli- through, or where grinding has exposed the basis metal,
ers of the processes should be consulted. preferred results are obtained by stripping the remaining
chromium completely. However, it is possible to obtain satis-
1.3 The values stated in SI units are to be regarded as
factory deposits on such substrates by careful attention to
standard. No other units of measurement are included in this
details in the pretreatment and electroplating process steps.
standard.
4.3 Stripping may be done by several methods, including
1.4 This standard does not purport to address all of the
proprietary processes or inhibited hydrochloric acid solution
safety concerns, if any, associated with its use. It is the
(10 to 20 % by volume), or anodic treatment at 55 to 800A/m
responsibility of the user of this standard to establish appro-
(5 to 75 A/ft ) in a solution of 35 to 50 g/L (5 to 7 oz/gal) of
priate safety and health practices and determine the applica-
sodium hydroxide or 60 to 75 g/L (8 to 10 oz/gal) of sodium
bility of regulatory limitations prior to use.
carbonate at 20 to 25°C (70 to 80°F).
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.4 Process Outline:
ization established in the Decision on Principles for the
4.4.1 Preclean (see 5.1.1 and 5.1.2),
Development of International Standards, Guides and Recom-
4.4.2 Alkaline electrolytic clean (see 5.1.3),
mendations issued by the World Trade Organization Technical
4.4.3 Rinse (cold water),
Barriers to Trade (TBT) Committee.
4.4.3.1 Rinse (hot water),
4.4.3.2 Dry,
2. Referenced Documents
4.4.3.3 Mask (see 5.2),
4.4.4 Activate (see 5.3),
2.1 ASTM Standards:
4.4.5 Chromium electroplate,
B177 Guide for Engineering Chromium Electroplating
4.4.6 Rinse (cold water),
3. Significance and Use
4.4.7 Rinse (hot water), and
4.4.8 Dry.
3.1 Electrodepositsofchromiumonchromiumareproduced
in cases where it is desired to obtain a better performing
5. Procedure
coating, to reclaim plated parts that are defective, or restore
5.1 Cleaning—The following cleaning treatments may be
worn chromium coatings to original dimensions.
used for all conditions and types of electrodeposited chro-
mium. The choice of the procedures will be governed largely
This practice is under the jurisdiction of ASTM Committee B08 on Metallic
by the condition of the surface.
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.02 on
5.1.1 Precleaning—When considerable amounts of grease
Pre Treatment.
and oil are present on the surface, precleaning (emulsion or
Current edition approved May 1, 2017. Published May 2017. Originally
alkaline spray or soak) is necessary to remove the bulk of the
approved in 1977. Last previous edition approved in 2010 as B630 – 88 (2010).
DOI: 10.1520/B0630-88R17.
soil.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.2 Abrasive Cleaning—Oxide and other films may be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
removedbymechanicaltechniquesusingsuchabrasivesasfine
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. emery on a cloth or a wheel, pumice slurry, or greaseless
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consh
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B630 − 88 (Reapproved 2010) B630 − 88 (Reapproved 2017)
Standard Practice for
Preparation of Chromium for Electroplating with Chromium
This standard is issued under the fixed designation B630; 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
1.1 This practice is intended to serve as a process guide (not as a standard procedure) for producing adherent electrodeposits
of chromium on chromium for engineering use.
1.2 Only well-known, generally practical methods using hexavalent chromium plating baths have been included. Some of the
newer proprietary chromium plating processes produce chromium plating for which this process is unsuitable. Suppliers of the
processes should be consulted.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
B177 Guide for Engineering Chromium Electroplating
3. Significance and Use
3.1 Electrodeposits of chromium on chromium are produced in cases where it is desired to obtain a better performing coating,
to reclaim plated parts that are defective, or restore worn chromium coatings to original dimensions.
4. Preparation of Surface
4.1 Surface Finishing—The smoothness of the chromium coating before electroplating with chromium should closely
approximate the requirements of the finished part. It is usually achieved by appropriate grinding with a diamond wheel.
4.2 Stripping and Basis Metal—With previously electroplated parts where the chromium deposit has been worn through, or
where grinding has exposed the basis metal, preferred results are obtained by stripping the remaining chromium completely.
However, it is possible to obtain satisfactory deposits on such substrates by careful attention to details in the pretreatment and
electroplating process steps.
4.3 Stripping may be done by several methods, including proprietary processes or inhibited hydrochloric acid solution (10 to
2 2
20 % by volume), or anodic treatment at 55 to 800 A/m (5 to 75 A/ft ) in a solution of 35 to 50 g/L (5 to 7 oz/gal) of sodium
hydroxide or 60 to 75 g/L (8 to 10 oz/gal) of sodium carbonate at 20 to 25°C (70 to 80°F).
4.4 Process Outline:
4.4.1 Preclean (see 5.1.1 and 5.1.2),
4.4.2 Alkaline electrolytic clean (see 5.1.3),
4.4.3 Rinse (cold water),
This practice 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 Nov. 1, 2010May 1, 2017. Published November 2010May 2017. Originally approved in 1977. Last previous edition approved in 20062010 as
B630 – 88 (2006).(2010). DOI: 10.1520/B0630-88R10.10.1520/B0630-88R17.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B630 − 88 (2017)
4.4.3.1 Rinse (hot water),
4.4.3.2 Dry,
4.4.3.3 Mask (see 5.2),
4.4.4 Activate (see 5.3),
4.4.5 Chromium electroplate,
4.4.6 Rinse (cold water),
4.4.7 Rinse (hot water), and
4.4.8 Dry.
5. Procedure
5.1 Cleaning—The following cleaning treatments may be used for all conditions and types of electrodeposited chromium. The
choice of the procedures will be governed largely by the condition of the surface.
5.1.1 Precleaning—When considerable amounts of grease and oil are present on the surface, precleaning (emu
...
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