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ASTM B893-98(2013)

(Specification)

Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications

Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications

SCOPE
1.1 This specification covers requirements for electrolytically formed oxide coatings on magnesium and magnesium alloy parts where appearance, abrasion resistance, and protection against corrosion are important.  
1.2 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.

General Information

Status
Historical
Publication Date
30-Apr-2013
ICS
25.220.20 - Surface treatment
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B893-98(2008) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
Effective Date
01-May-2013
Referred By
ASTM B1023-22 - Standard Test Method for Abrasion Resistance of Hard Anodic Coatings by a Taber-Type Abraser
Effective Date
01-May-2013
Referred By
ASTM G195-22 - Standard Guide for Conducting Wear Tests Using a Rotary Platform Abraser
Effective Date
01-May-2013

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ASTM B893-98(2013) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering ApplicationsASTM B893-98(2013) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
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ASTM B893-98(2013) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B893 −98 (Reapproved 2013)
Standard Specification for
Hard-Coat Anodizing of Magnesium for Engineering
Applications
This standard is issued under the fixed designation B893; 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 D4060 Test Method for Abrasion Resistance of Organic
Coatings by the Taber Abraser
1.1 This specification covers requirements for electrolyti-
cally formed oxide coatings on magnesium and magnesium
3. Terminology
alloy parts where appearance, abrasion resistance, and protec-
3.1 Definitions:
tion against corrosion are important.
3.1.1 Definitions—For definitions of terms relating to this
1.2 This standard does not purport to address all of the
specification see Terminology B374.
safety concerns, if any, associated with its use. It is the
3.1.2 anodizing—an electrolytic oxidation process in which
responsibility of the user of this standard to establish appro-
the surface of a metal, when anodic, is converted to a coating
priate safety and health practices and determine the applica-
having desirable protective or functional properties.
bility of regulatory limitations prior to use.
3.1.3 hard coat—in anodizing magnesium, an anodic oxide
2. Referenced Documents coating on magnesium with a higher apparent density and
2 thickness, and a greater resistance to wear than the base metal.
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus
4. Classification
B244 Test Method for Measurement of Thickness ofAnodic
4.1 Coating Designation—Thickness.
Coatings on Aluminum and of Other Nonconductive
4.1.1 Minimum thickness of 20 µm.
Coatings on Nonmagnetic Basis Metals with Eddy-
Current Instruments
4.2 TYPE—Post treatments.
B322 Guide for Cleaning Metals Prior to Electroplating
4.2.1 TYPE A—No post treatment.
B374 Terminology Relating to Electroplating
4.2.2 TYPE B—Purchaser specified.
B487 Test Method for Measurement of Metal and Oxide
Coating Thickness by Microscopical Examination of 5. Ordering Information (to be supplied by the purchaser
Cross Section
to the producer.)
B537 Practice for Rating of Electroplated Panels Subjected
5.1 Alloy Designation—When ordering articles anodized in
to Atmospheric Exposure
accordancewiththisspecification,thepurchasershallstate,the
B602 Test Method for Attribute Sampling of Metallic and
alloy designation number.
Inorganic Coatings
5.2 Appearance—Unless otherwise specified by the
B697 Guide for Selection of Sampling Plans for Inspection
purchaser, an off-white color shall be acceptable for TYPE A
of Electrodeposited Metallic and Inorganic Coatings
coating. The purchaser shall specify the color and surface
B762 Test Method of Variables Sampling of Metallic and
appearancerequiredforTYPEBcoatings.Allcoatingsshallbe
Inorganic Coatings
uniform in color and free from stains. Alternatively, samples
D3951 Practice for Commercial Packaging
showing the required finish, or range of finishes, shall be
supplied or approved by the purchaser. When required, the
basis material may be subjected to such mechanical polishing
This specification is under the jurisdiction of ASTM Committee B08 on
as may be required to yield the desired final surface character-
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
B08.07 on Conversion Coatings.
istics.
Current edition approved May 1, 2013. Published May 2013. Originally
5.3 Significant Surface—The areas of the article covered by
approved in 1998. Last previous edition approved in 2008 as B893 – 98 (2008).
DOI: 10.1520/B0893-98R13.
the coating, for which the coating is essential for service or
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
appearance or both.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3.1 Contact Marks—Contact marks will occur. The pur-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. chaser shall specify where contact marks are unacceptable.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B893−98 (2013)
5.4 Tolerances—Dimensional build-up is approximately 7.1.2.1 Coating Thickness for SC20—The anodic film thick-
one-half of anodic film thickness. The order document shall nessshallbeaminimumof20µmandnotexceed30µmonthe
include any coating thickness tolerances and shall not exceed significant surface.
any applicable drawing dimensions. 7.1.2.2 Test—Hard-coating thickness shall be evaluated by
one or more of the following test methods in Section 8.
5.5 Thepurchasershallprovidethenumberforthisstandard
TYPE. 7.2 Qualification Tests—The process shall be evaluated
monthly or more frequently if required by the purchaser using
5.6 The purchaser shall state any special post treatments
the following test methods on panels that are of the same alloy
(see 4.2 and 5.2).
of the parts coated with TYPE A hard coat.
5.7 Test Methods—The purchaser shall state the test meth-
7.2.1 Corrosion Test—Use method described in 8.1.
od(s) by which the coated article will be evaluated (see Section
7.2.2 Abrasion Resistance Test—Use the Taber Abraser test
8).
method in Annex A1 of this specification.
5.8 Sampling Plan—see Section 9.
8. Test Methods
5.9 Any requirement for certification (see Section 11).
8.1 Corrosion Test—Panel(s)shallbesubjectedtoa5 %salt
spray (fog) test in accordance with Practice B117 for 336 h.
5.10 Any requirement for packaging (see Section 12).
The panel(s) shall be prepared and evaluated in accordance
with Practice B537. A protective rating of 6 or less is
6. Materials and Process
considered a failure.
6.1 Process:
8.2 Abrasion Resistance Test—Test panels in accordance
6.1.1 Basis Metal—This specification does not specify re-
with Annex A1. The acceptance criteria shall be as follows.
quirements for the surface condition of the basis metal before
8.2.1 Abrasive Wheel No. CS-10—A wear index of more
anodizing, but agreement should preferably be reached be-
than 7 mg/1000 cycles or less than 10 000 wear cycles shall be
tweenthepurchaserandtheproducerthatthesurfacecondition
considered a failure.
of the basis metal is satisfactory.
8.2.2 Abrasive Wheel No. CS-17—A wear index of more
6.1.2 Surface Preparation—Preparatory procedures and
than 20 mg/1000 cycles or less than 5 000 wear cycles shall be
cleaning of the basis material may be necessary, see Practice
considered a failure.
B322.
6.1.3 Hard-Coating—Following the preparatory operations,
8.3 Thickness Tests:
the articles are introduced into the solution for a period of time
8.3.1 Eddy-Current Method (Test Method B244).
at the current density and temperature required to produce the
8.3.2 Microscopical Cross Section Method (Test Method
hard-coated surface. B487).
NOTE 1—Hard-coating solutions and operating conditions are commer-
9. Sampling
cially available. The appropriate operating instructions should be fol-
9.1 The purchaser and producer are urged to employ statis-
lowed.
tical process control in the coating process. Properly
NOTE 2—Intricately shaped articles may not receive the same thickness
of coating in recessed areas due to lower current densities. Auxiliary
performed, statistical process control will ensure coated prod-
cathodes, may be used to improve anodize thickness in these areas.
ucts of satisfactory quality and will reduce the amount of
6.2 Post Treatments: acceptance inspection. The sampling plan used for the inspec-
tion of the quality coated article shall be agreed upon between
6.2.1 Final Rinsing—Rinsing subsequent to an
...

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SCOPE
1.1 This specification covers requirements for electrolytically formed oxide coatings on magnesium and magnesium alloy parts where appearance, abrasion resistance, and protection against corrosion are important.  
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