ASTM B893-1998(2013) Standard Specification for Hard-Coat Anodizing of Magnesium for Engineering Applications《工程应用硬涂层阳极氧化的标准规范》.pdf
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1、Designation: B893 98 (Reapproved 2013)Standard Specification forHard-Coat Anodizing of Magnesium for EngineeringApplications1This standard is issued under the fixed designation B893; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers requirements for electrolyti-cally formed oxide coatings on magnesium and magnes
3、iumalloy parts where appearance, abrasion resistance, and protec-tion against corrosion are important.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and he
4、alth practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusB244 Test Method for Measurement of Thickness of AnodicCoatings on Aluminum and of Other NonconductiveCoatings on No
5、nmagnetic Basis Metals with Eddy-Current InstrumentsB322 Guide for Cleaning Metals Prior to ElectroplatingB374 Terminology Relating to ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB537 Practice for Rating of Electropla
6、ted Panels Subjectedto Atmospheric ExposureB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsD395
7、1 Practice for Commercial PackagingD4060 Test Method for Abrasion Resistance of OrganicCoatings by the Taber Abraser3. Terminology3.1 Definitions:3.1.1 DefinitionsFor definitions of terms relating to thisspecification see Terminology B374.3.1.2 anodizingan electrolytic oxidation process in whichthe
8、surface of a metal, when anodic, is converted to a coatinghaving desirable protective or functional properties.3.1.3 hard coatin anodizing magnesium, an anodic oxidecoating on magnesium with a higher apparent density andthickness, and a greater resistance to wear than the base metal.4. Classificatio
9、n4.1 Coating DesignationThickness.4.1.1 Minimum thickness of 20 m.4.2 TYPEPost treatments.4.2.1 TYPE ANo post treatment.4.2.2 TYPE BPurchaser specified.5. Ordering Information (to be supplied by the purchaserto the producer.)5.1 Alloy DesignationWhen ordering articles anodized inaccordance with this
10、 specification, the purchaser shall state, thealloy designation number.5.2 AppearanceUnless otherwise specified by thepurchaser, an off-white color shall be acceptable for TYPE Acoating. The purchaser shall specify the color and surfaceappearance required for TYPE B coatings.All coatings shall beuni
11、form in color and free from stains. Alternatively, samplesshowing the required finish, or range of finishes, shall besupplied or approved by the purchaser. When required, thebasis material may be subjected to such mechanical polishingas may be required to yield the desired final surface character-is
12、tics.5.3 Significant SurfaceThe areas of the article covered bythe coating, for which the coating is essential for service orappearance or both.5.3.1 Contact MarksContact marks will occur. The pur-chaser shall specify where contact marks are unacceptable.1This specification is under the jurisdiction
13、 of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.07 on Conversion Coatings.Current edition approved May 1, 2013. Published May 2013. Originallyapproved in 1998. Last previous edition approved in 2008 as B893 98 (2008).DOI: 10.1520/B0893-98R
14、13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Bo
15、x C700, West Conshohocken, PA 19428-2959. United States15.4 TolerancesDimensional build-up is approximatelyone-half of anodic film thickness. The order document shallinclude any coating thickness tolerances and shall not exceedany applicable drawing dimensions.5.5 The purchaser shall provide the num
16、ber for this standardTYPE.5.6 The purchaser shall state any special post treatments(see 4.2 and 5.2).5.7 Test MethodsThe purchaser shall state the test meth-od(s) by which the coated article will be evaluated (see Section8).5.8 Sampling Plansee Section 9.5.9 Any requirement for certification (see Se
17、ction 11).5.10 Any requirement for packaging (see Section 12).6. Materials and Process6.1 Process:6.1.1 Basis MetalThis specification does not specify re-quirements for the surface condition of the basis metal beforeanodizing, but agreement should preferably be reached be-tween the purchaser and the
18、 producer that the surface conditionof the basis metal is satisfactory.6.1.2 Surface PreparationPreparatory procedures andcleaning of the basis material may be necessary, see PracticeB322.6.1.3 Hard-CoatingFollowing the preparatory operations,the articles are introduced into the solution for a perio
19、d of timeat the current density and temperature required to produce thehard-coated surface.NOTE 1Hard-coating solutions and operating conditions are commer-cially available. The appropriate operating instructions should be fol-lowed.NOTE 2Intricately shaped articles may not receive the same thicknes
20、sof coating in recessed areas due to lower current densities. Auxiliarycathodes, may be used to improve anodize thickness in these areas.6.2 Post Treatments:6.2.1 Final RinsingRinsing subsequent to anodizing isnecessary to remove all traces of the electrolyte that may affectthe appearance and perfor
21、mance of the part. Deionized ordistilled water may be used to avoid water spots.6.2.2 Post TreatmentSurface sealers or topcoats may bespecified to reduce friction, add color, or further increaseperformance.7. Requirements7.1 Acceptance:7.1.1 Visual DefectsThe significant surfaces of the articleto be
22、 hardcoated shall be free of clearly visible defects such aspits, roughness, striations, or discoloration when examinedwith normal or corrected to 20/20 eyesight at a distance ofapproximately 0.5 m.NOTE 3Defects in the surface of the basis material such as scratches,porosity, inclusions, etc., may a
23、dversely affect the appearance andperformance of the article.7.1.2 Thickness:7.1.2.1 Coating Thickness for SC20The anodic film thick-ness shall be a minimum of 20 m and not exceed 30 m on thesignificant surface.7.1.2.2 TestHard-coating thickness shall be evaluated byone or more of the following test
24、 methods in Section 8.7.2 Qualification TestsThe process shall be evaluatedmonthly or more frequently if required by the purchaser usingthe following test methods on panels that are of the same alloyof the parts coated with TYPE A hard coat.7.2.1 Corrosion TestUse method described in 8.1.7.2.2 Abras
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