1、Designation: D2201 18Standard Practice forPreparation of Zinc-Coated and Zinc-Alloy-Coated SteelPanels for Testing Paint and Related Coating Products1This standard is issued under the fixed designation D2201; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, 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 practice covers the preparation of zinc-coated andzinc-alloy-coated sheet s
3、teel panels to be used for testing paint,varnish, lacquer, conversion coatings, and related products. Itcovers sheet steel coated with hot dipped galvanized, one-sidegalvanized, electrogalvanized, zinc-iron alloy coatings (such asgalvanneal), and zinc-5 % aluminum alloy coatings. It does notcover st
4、eel panels coated with 55 % aluminum-45 % zinc alloy,because these behave more like aluminum than zinc.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,
5、 if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with inter
6、nationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A653/
7、A653M Specification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet, Zinc-5 % Alu-minum Alloy-Coated by the Hot-Dip ProcessA879/A879M Specification for Steel Sheet, Zinc Coated bythe Electrolytic Process
8、for Applications Requiring Des-ignation of the Coating Mass on Each SurfaceA1092 Specification for Steel Sheet, as Cold-Reduced, forConversion to Annealed Cold-Rolled Steel Sheet, and HotDip Metallic-Coated Steel SheetD609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint, Varnis
9、h, Conversion Coatings, andRelated Coating ProductsD6386 Practice for Preparation of Zinc (Hot-Dip Galva-nized) Coated Iron and Steel Product and HardwareSurfaces for PaintingD7396 Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting2.2 ISO Standards:3ISO 357
10、5 Continuous hot-dip zinc-coated carbon steel sheetof commercial, lock-forming and drawing qualitiesISO 5002 Hot-rolled and cold-reduced electrolytic zinc-coated carbon steel sheet of commercial and drawingqualities3. Significance and Use3.1 The procedures described in this practice are designed top
11、rovide uniform zinc coated steel panels for testing of paint,varnish, lacquer, conversion coatings and related products.3.2 The proper description of the zinc coating on thesubstrate is an important part of this practice. Seemingly slightdifferences in zinc coating can produce substantial difference
12、sin coating performance.4. Metal Substrate4.1 The test panels shall be completely free of any visiblesigns of storage stain or white rust (zinc corrosion).All cornersand edges shall be smooth and uniformly rounded.4.2 The type of zinc coating, zinc thickness, metalthickness, and panel size shall be
13、agreed upon between thepurchaser and seller.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Current edition approved Feb. 15, 2018. Published March 2
14、018. Originallyapproved in 1963. Last previous edition approved in 2011 as D2201 99 (2011).DOI: 10.1520/D2201-18.2For 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
15、 standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis int
16、ernational standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) C
17、ommittee.14.3 Zinc coated steel may be shipped from the mills unoiled.However, zinc coated steel that has been oiled with a nonre-active rust preventative oil shall be acceptable under thisspecification.4.4 Zinc coated steel may be shipped from the mill with aphosphate pretreatment for improved pain
18、t bonding.NOTE 1Caution: Alkaline cleaning such pre-phosphated metal willoften remove the phosphate coating4.5 Elimination of Passivating Treatments:4.5.1 The test panels shall be free of passivating treatments(Note 2), because such treatments interfere with paint bonding.NOTE 2Passivating treatment
19、s are applied at the mill to preventoxidation of the zinc (white rust) during storage. Because they bondtightly to the zinc, they also prevent paints and other coatings frombonding to the zinc. Zinc coated material stocked in commercial ware-houses almost always has a passivating treatment. To obtai
20、n nonpassivatedzinc coated steel, its generally necessary to special order steel directlyfrom a steel mill, or to buy panels from manufacturers of standard testpanels. See Appendix titled Identifying the Presence of and RemovingChromate Treatments used as Wet-Storage (Also Called Humid-Storage)Stain
21、 Inhibitors of Practice D6386 for further information on identifyingthe presence of passivating treatments.4.5.2 Zinc coated sheet that has never been subjected to anykind of passivating treatment is preferred for this practice.4.5.3 Zinc coated sheet that has been passivated may beused if the passi
22、vating treatment is removed in accordance with5.1.NOTE 3Caution: Removing the passivation may alter the morphol-ogy of the zinc crystal structure.5. Methods of Preparation5.1 If the surface has a passivating treatment, remove it byrubbing with a non-woven abrasive pad and rinsing withdistilled or de
23、ionized water.5.2 Use one of the methods of preparation described inSpecification A1092 or Guide D7396.NOTE 4Oiled electrogalvanized or zinc-iron alloy sometimes needs tobe cleaned with mineral spirits before alkaline cleaning, depending on thelength of time the metal has been stored with the oil on
24、 the surface.5.3 After preparation, the surface of the panel shall bewater-break free. This is determined by immersing a represen-tative panel momentarily in distilled water. The water shouldform a continuous unbroken film over the entire surface,without beading up into droplets or other water break
25、s. If thesurface is not water-break free, it is generally an indication ofcontaminants on the surface, and further cleaning is required.6. Protection after Processing6.1 To prevent corrosion, panels should be used as quicklyas possible after processing. Panels that are not to be usedimmediately afte
26、r preparation shall be wrapped in a paperimpregnated with a volatile corrosion inhibitor (VCI) specifi-cally designed for zinc, and then placed in a waterproof bag orenvelope. In order to avoid contamination from fingerprints, donot touch the surface of the panel after it has been cleaned.Handle the
27、 panels by the edges only.7. Report7.1 Report the following information:7.1.1 Panel size and thickness,7.1.2 Steel temper (for example, commercial quality, draw-ing quality, drawing quality special killed),7.1.3 Method of preparation used,7.1.4 Description of Zinc CoatingIt is absolutely essentialto
28、 report a detailed description of zinc coating. Seeminglyslight differences in zinc coating can make a large difference incoating performance. Information on describing the zinc coat-ing can be found in Appendix X1. The description of zinccoating should include:7.1.4.1 Type of coating,7.1.4.2 Coatin
29、g weight (on each side of the panels if there isa difference),7.1.4.3 Spangle (for hot dipped galvanized),7.1.4.4 Passivating treatment, if any, and7.1.4.5 Phosphate pretreatment applied at the steel mill, ifany.8. Keywords8.1 galvanized surfaces; specimen preparation; steel panels;test specimens; z
30、incAPPENDIX(Nonmandatory Information)X1. CHARACTERIZATION OF ZINC COATINGX1.1 This appendix briefly describes many of the zinc andzinc alloy coatings, but is not exhaustive. New types ofcoatings and variations on existing coatings are always beingdeveloped. Further information on zinc coated steel c
31、an beobtained from the applicable ASTM specification, or ISOspecification, or from the American Iron and Steel Institute(AISI), 1133 15th Street NW, Washington, DC 20005.X1.2 Hot-Dipped Zinc Coated (Specification A1092): Thisis a pure zinc “galvanized” coating produced by immersing thesteel in a bat
32、h of molten zinc. Unless special steps are taken, itproduces a “full spangle” pattern of zinc crystals like thefamiliar pattern on sheet metal air ducts. For improved paintappearance, special processing can create a “minimizedspangle” with much smaller crystals, or a “spangle free”D2201 182surface w
33、here the crystal structure is not visible. CommonASTM Specification A1092 coating weights are G60 (0.60oz/ft2), or G90 (0.90 oz/ft2), up to G235 (2.35 oz/ft2). CommonISO coating weights are Z700 (700 g/m2), Z350 (350 g/m2),Z100 (100 g/m2) and Z001 (no minimum). Refer to ISO 3575for further informati
34、on.X1.3 Zinc-Iron Alloy Coated (Specification A1092): Thiscoating is often called “galvannealed.” It is produced byheating or wiping a hot dipped zinc coating to convert itcompletely into a zinc-iron alloy. Common SpecificationA1092 coating weights areA60 (0.60 oz/ft2),A40 (0.40 oz/ft2),down to A01
35、(no minimum coating weight). Common ISOcoating weights are ZF 180 (180 g/m2), ZF 100 (100 g/m2), andZF 001 (no minimum). Refer to ISO 3575 for further informa-tion.X1.4 Electroplated Zinc Coated (Specification A879/A879M): Often called “electrogalvanized,” this coating isproduced by continuous elect
36、roplating. ASTM coating weightis expressed as A (no minimum), B (0.070 oz/ft2), or C (0.150oz/ft2). Common ISO coating weights are ZE 10/10 (1.0 m)and ZE 75/75 (7.5 m). Refer to ISO 5002 for further infor-mation. In addition to pure zinc, electroplated coatings are alsomade in zinc/iron alloy and zi
37、nc/nickel alloy.X1.5 One Sided or Differentially Coated: Zinc and zincalloy coatings are frequently produced with no coating on oneside or with a much lower coating weight on one side. In suchcases, its important to report the coating weight on both sides.Also, sheet steels can be coated with a heav
38、ier coating ofhot-dipped zinc or electroplated zinc on one side, and a lightercoating of zinc-iron alloy on the back side. The two sides ofsuch sheets will have very different characteristics in terms ofpaint performance. Common ISO coating weights are ZE 135/0(13.5 m/0 m) and ZE 150/0 (15.0 m/0 m).
39、X1.6 Zinc-5 % Aluminum Alloy Coated (SpecificationA875/A875M): This hot dipped coating, often called “Galfan”is approximately 95 % zinc, 5 % aluminum, and approximately0.1 % other metals (either magnesium or “mischmetal,” amixture of rare earth metals). Common ASTM SpecificationA875/A875M coating we
40、ights are GF30 (0.30 oz/ft2), GF45(0.45 oz/ft2), up to GF235 (2.35 oz/ft2).ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity
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