ASTM D4138-2007a(2017) Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Cross-Sectioning Means《用横截面分割破坏法测定防护涂层系统干膜厚度的标准实施规程》.pdf
《ASTM D4138-2007a(2017) Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Cross-Sectioning Means《用横截面分割破坏法测定防护涂层系统干膜厚度的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4138-2007a(2017) Standard Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive Cross-Sectioning Means《用横截面分割破坏法测定防护涂层系统干膜厚度的标准实施规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4138 07a (Reapproved 2017)Standard Practices forMeasurement of Dry Film Thickness of Protective CoatingSystems by Destructive, Cross-Sectioning Means1This standard is issued under the fixed designation D4138; the number immediately following the designation indicates the year oforigina
2、l adoption or, 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 describes the measurement of dry filmthickness of co
3、ating films by microscopic observation ofprecision angular cuts in the coating film. Use of theseprocedures may require repair of the coating film. This practiceis intended to supplement the manufacturers instructions forthe manual operation of the gages and is not intended to replacethem. It includ
4、es definitions of key terms, referencedocuments, the significance and use of the practice, and theadvantages and limitations of the instruments.1.2 Three procedures are provided for measuring dry filmthickness of protective coating systems:1.2.1 Procedure AUsing groove cutting instruments.1.2.2 Proc
5、edure BUsing grinding instruments.1.2.3 Procedure CUsing drill bit instruments.1.3 These procedures are not applicable for soft or ductilesubstrates that may deform under the test gage cutting tip. Thesubstrate should be sufficiently rigid to prevent deformation ofthe coating during the cutting proc
6、ess. The surface may be flator moderately curved. Pipes as small as 25 mm (1 in.) indiameter may be measured in the axial direction.1.4 Individual coats in a multicoat system where there is adiscernible visual difference between coats or the overallthickness of a coating system can be measured by th
7、eseprocedures.1.5 The range of thickness measurement is typically 2 to2000 microns (0.1 to 80 mils) and depends upon the cuttingangle of the blade.1.6 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.7 This standard does not p
8、urport 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international stan
9、dard was developed in accor-dance with internationally 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. R
10、eferenced Documents2.1 ASTM Standards:2D823 Practices for Producing Films of Uniform Thicknessof Paint, Varnish, and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD7091 Practice for Nondestructive Measurement of DryFilm T
11、hickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic, Nonconductive Coat-ings Applied to Non-Ferrous Metals3. Terminology3.1 Definitions of Terms:3.1.1 accuracy, nthe measure of the magnitude of errorbetween the result of a measurement and the true thickness ofthe item being mea
12、sured.3.1.2 dry film thickness, nthe thickness of a coating (orcoating layers) as measured from the surface of the substrate.3.1.3 micrometre (micron), none one-thousandths of amillimetre (0.001 mm); 25.4 microns = 1 mil.3.1.4 mil, nan imperial unit of measure; one one-thousandths of an inch (0.001
13、in.); 1 mil = 25.4 microns.3.1.5 reticle, na scale on transparent material fitted at thefocal plane of the eyepiece of the microscope for the purposeof measuring the width of a feature within the image.4. Summary of Practice4.1 The three procedures are based on measurement of dryfilm thickness by ob
14、servation of the width of angular cuts in the1These practices are under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and are the direct responsibilityof Subcommittee D01.23 on Physical Properties of Applied Paint Films.Current edition approved Dec.
15、 1, 2017. Published December 2017. Originallyapproved in 1982. Last previous edition approved in 2013 as D4138 07a (2013).DOI: 10.1520/D4138-07AR17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandar
16、ds volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles o
17、n 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) Committee.1coating through a microscope having a built-in reticle with ascale. Each procedure
18、 employs different instruments to makethe cut in the coating.4.2 Procedure AUses a carbide or carbide-tipped wedge tocut a groove in the coating. The groove is cut at a precise angleto the surface. Various wedge angles are available. Thisprocedure requires the manual cutting of the coating bydraggin
19、g a cutting wedge through both the coating and thesurface of the substrate. In this operation, the cutter trailsmidway between the two guide studs. Continuous 3pointsurface contact should be maintained to assure precise verticalalignment of the groove. Excessive pressure on the guide studsshould be
20、avoided. On wood or other directional material,incisions should be made in the grain or “machine” direction toavoid ragged cuts.4.3 Procedure BUses a high speed rotary grinding disk ordrum type bit to cut partial cylindrical cavities in the coating.Axes of the cavities can be oriented at various ang
21、les ofinclination to the surface. This procedure is similar to Proce-dureAexcept in how the cut is made.This technique eliminatesthe deformations of coating and substrate that may occur whenconventional cutting wedges are used. Hard, brittle, tough,fibrous, tender, or elastomeric materials exhibit c
22、lean, non-tearing, controlled disintegration under the rotary cutter. Thehigh-speed “erodes” away surface material in a precise pattern,leaving adjacent and underlying areas undisturbed.4.4 Procedure CUses a specific angle tip drill bit to cut aconical cavity in the coating. This procedure is common
23、ly usedfor hard, brittle or very thin coatings. Less damage often resultsfrom the small hole used to measure thickness.4.5 All procedures involve cutting through the coating. Thecutting operation works better on some coatings than on others.For example, elastomeric coatings may close up after cuttin
24、g.Some plastic coatings may stretch. Other coatings may tear.The cutting process must result in a clearly visible cross-section of the coating or coating system and the substrate. Softor elastic materials can sometimes be cooled or frozen to obtaingood cutting characteristics. With some coatings, im
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