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ASTM B893-98(2003)

(Specification)

Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications

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
09-Feb-2003
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 - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
Effective Date
10-Feb-2003
Replaced By
ASTM B893-98(2008) - Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
Effective Date
01-Apr-2008
Referred By
ASTM B1023-22 - Standard Test Method for Abrasion Resistance of Hard Anodic Coatings by a Taber-Type Abraser
Effective Date
10-Feb-2003
Referred By
ASTM G195-22 - Standard Guide for Conducting Wear Tests Using a Rotary Platform Abraser
Effective Date
10-Feb-2003

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ASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering ApplicationsASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
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ASTM B893-98(2003) - Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B 893 – 98 (Reapproved 2003)
Specification for
Hard-Coat Anodizing of Magnesium for Engineering
1
Applications
This standard is issued under the fixed designation B 893; 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.
1. Scope D 4060 Test Method for Abrasion Resistance of Organic
5
Coatings by the Taber Abraser
1.1 This specification covers requirements for electrolyti-
2.2 ISO Standard:
cally formed oxide coatings on magnesium and magnesium
ISO 2080 Electroplating and Related Processes - Vocabu-
alloy parts where appearance, abrasion resistance, and protec-
5
lary
tion against corrosion are important.
1.2 This standard does not purport to address all of the
3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms relating to this
responsibility of the user of this standard to establish appro-
specification see Terminology B 374.
priate safety and health practices and determine the applica-
3.1.1 anodizing—an electrolytic oxidation process in which
bility of regulatory limitations prior to use.
the surface of a metal, when anodic, is converted to a coating
2. Referenced Documents having desirable protective or functional properties.
3.1.2 hard coat—in anodizing magnesium, an anodic oxide
2.1 ASTM Standards:
2
coating on magnesium with a higher apparent density and
B 117 Practice for Operating Salt Spray (Fog) Apparatus
thickness, and a greater resistance to wear than the base metal.
B 244 Test Method for Measurement of Thickness of An-
odic Coatings on Aluminum and of Other Nonconductive
4. Classification
Coatings on Nonmagnetic Basis Metals with Eddy-Current
3 4.1 Coating Designation—Thickness.
Instruments
3
4.1.1 Minimum Thickness of 20 µm.
B 322 Practice for Cleaning Metals Prior to Electroplating
3 4.2 TYPE - Post Treatments.
B 374 Terminology Relating to Electroplating
4.2.1 TYPE A—no post treatment.
B 487 Test Method for Measurement of Metal and Oxide
4.2.2 TYPE B—Purchaser Specified.
Coating Thickness by Microscopical Examination of a
3
Cross Section
5. Ordering Information (to be supplied by the purchaser
B 537 Practice for Rating of Electroplated Panels Subjected
to the producer.)
3
to Atmospheric Exposure
5.1 Alloy Designation—When ordering articles anodized in
B 602 Test Method for Attribute Sampling of Metallic and
3 accordancewiththisspecification,thepurchasershallstate,the
Inorganic Coatings
alloy designation number.
B 697 Guide for Selection of Sampling Plans for Inspection
3 5.2 Appearance—Unless otherwise specified by the pur-
of Electrodeposited Metallic and Inorganic Coatings
chaser, an off-white color shall be acceptable for TYPE A
B 762 Test Method of Variables Sampling of Metallic and
3 coating. The purchaser shall specify the color and surface
Inorganic Coatings
4 appearancerequiredforTYPEBcoatings.Allcoatingsshallbe
D 3951 Practice for Commercial Packaging
uniform in color and free from stains. Alternatively, samples
showing the required finish, or range of finishes, shall be
1
This specification is under the jurisdiction of ASTM Committee B08 on supplied or approved by the purchaser. When required, the
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
basis material may be subjected to such mechanical polishing
B08.07 on Chromate Conversion Coatings.
as may be required to yield the desired final surface character-
Current edition approved Feb. 10, 2003. Published May 2003. Originally
istics.
approved in 1998. Last previous edition approved in 1998 as B 893 – 98.
2
Annual Book of ASTM Standards, Vol. 03.02.
3
Annual Book of ASTM Standards, Vol. 02.05.
4 5
Annual Book of ASTM Standards, Vol. 15.09. Annual Book of ASTM Standards, Vol. 06.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B 893 – 98 (2003)
performance of the article.
5.3 Significant Surface—The areas of the article covered by
the coating, for which the coating is essential for service or
7.1.2 Thickness
appearance or both.
7.1.2.1 CoatingThicknessforSC20—Theanodicfilmthick-
5.3.1 Contact Marks—Contact marks will occur. The Pur-
nessshallbeaminimumof20umandnotexceed30umonthe
chaser shall specify where contact marks are unacceptable.
significant surface.
5.4 Tolerances—Dimensional build-up is approximately
7.1.2.2 Test—Hard-coating thickness shall be evaluated by
one-half of anodic film thickness. The order document shall
one or more of the following test methods in Section 8.
include any coating thic
...

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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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This specification covers measurement of strain resistance of anodic coatings on aluminium and its alloys, that have undergone a sealing treatment and contact with an acidic solution, are stainproof or nonadsorptive with respect to dyes. The method comprises contacting the test area of the anodized specimen with nitric acid solution and, after rinsing and drying, applying a special dye solution followed by rinsing and rubbing the test area with pumice powder, drying, and visual examination of the test area for retention of dye stain. Coatings that exhibit no dye stain or change in color are considered to have passed the test. Reagent grade chemicals shall be used in all tests. A specified solution of nitric acid shall be prepared in distilled or deionized water. A specified volume of aluminium blue 2WL dye shall be dissolved in distilled or deionized water.
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1.1 This test method is intended to determine whether anodic oxide coatings on aluminum and its alloys, that have undergone a sealing treatment and contact with an acid solution, are stainproof or nonadsorptive with respect to dyes.  
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1.3 This test method is applicable to anodic coatings intended for applications where they are exposed to the weather, or for protective purposes in corrosive media, and where resistance to staining is important.
Note 1: Performance in this test is predictive only of susceptibility to stain by dyes. It is not intended to be predictive of other factors in service performance such as pitting or general corrosion.
Note 2: For Aluminum Association Class I and II architectural anodic coatings that are sealed in solutions containing less than 15 ppm silicates or 3 ppm phosphates, the acid pretreatment may be omitted.  
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1.5.3 Anodic coatings that have been sealed only in dichromate solutions.  
1.5.4 Anodic coatings that have undergone a treatment to render them hydrophobic.  
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.7 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.  
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