ASTM D6206-2003 Standard Practice for Sampling of Coating Films《涂膜样本的标准规格》.pdf

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1、Designation: D 6206 03Standard Practice forSampling of Coating Films1This standard is issued under the fixed designation D 6206; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses ind

2、icates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers methods to remove samples ofcoating films for subsequent analysis related to identification ofgeneric coating type and failure analysis or

3、 other reasons.These techniques can be used in the field, the fabricating shop,or laboratory.1.2 The method for obtaining coating samples for heavymetal analysis is presented in Practice D 5702.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are f

4、or informationonly.1.4 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 health practices and determine the applica-bility of regulatory limitations prior to

5、use.2. Referenced Documents2.1 ASTM Standards:D 4840 Guide for Sampling ChainofCustody Procedures2D 5702 Practice for Field Sampling of Coating Films forAnalysis for Heavy Metals33. Significance and Use3.1 Specimens for analysis must be adequately sampled,packaged, and documented to obtain meaningfu

6、l informationfrom the laboratory. The sampling procedure and packagingwill be dependent upon the reason for taking the sample.4. Procedure4.1 General:4.1.1 Contaminating samples must be avoided. Hands mustbe kept clean by washing or wearing protective covers such aslatex gloves. Contact the laborato

7、ry that will perform theanalysis to determine if any other precautions are needed.Clean blades or knife between each sample with a rag soakedin solvent, or change blades between each sample.4.1.2 The number and location of samples will vary depend-ing upon the reason for sampling. Document the sampl

8、inglocation prior to obtaining the sample. Measure and record dryfilm thicknesses. If delamination is present, measure and recorddry film thickness of the coating remaining in the delaminatedarea as well as the intact area. Record the type of delamination,that is, adhesive or cohesive, and the color

9、 of the coatinglayer(s) where the delamination occurred. Document any othervisual defects such as alligatoring, mudcracking, checking,blistering, nonuniform appearance, or chalking.4.1.3 Obtain any history of the coating system available.This should include when the coating was applied, the type ofc

10、oating, and intended dry film thicknesses. Obtain a copy of thepainting, if possible, to verify the information.4.1.4 Photograph the sample area before and after obtainingthe sample.4.1.5 Samples should be sent to the laboratory with achainofcustody form, especially if there are existing orpotential

11、 legal ramifications to the results of the laboratoryanalysis. Guide D 4840 presents the minimum requirements forsample chainofcustody procedures.4.2 Peeling Paint or Paint with Poor Adhesion:4.2.1 Samples should be taken that have not had both sidesexposed to the elements. Make an incision approxim

12、ately 5 cm(2-in.) long in the coating using a sharp knife blade (such as autility knife). Hold the blade at a low angle to the surface andprobe the incision by pushing forward on the knife. Alterna-tively, it may be possible to remove the sample by cutting a 5cm (2-in.) square in the coating and pee

13、ling a sample byinserting the knife blade held at a low angle to the surface atone of the edges of the incision. For brittle coatings, maskingtape may be used to hold the film together during removal.4.2.2 Obtain at least three samples, each sample being atleast 5 cm (2-in.) square. Smaller samples

14、are allowed ifa5cm(2-in.) square piece cannot be removed. Ensure that the threesamples represent the same system. Place the samples in aplastic bag, aluminum foil, or envelope. Mark the outside ofthe bag or envelope with the identity of the sample, includingdate, name of person taking the sample, pr

15、oject location, arealocation, and type of sample. Use a different container for eacharea sampled.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Co

16、atings.Current edition approved Jan. 10, 2003. Published May 2003. Originallyapproved in 1997. Last previous edition approved in 1997 as D 6206 - 97.2Annual Book of ASTM Standards, Vol 11.01.3Annual Book of ASTM Standards, Vol 06.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700,

17、West Conshohocken, PA 19428-2959, United States.4.2.3 Place a mark on the outer surface of the coating chipusing a felttipped pen or other available marker. If analysis ofthe topcoat is desired, identify the topcoat and disbondmentsurfaces in the documentation using attributes such as color,gloss, o

18、r obvious presence of a foreign substance. Record thelocation where the sample was obtained, whether the failureplane was between coats or within a coat, and the identificationof the top coat and disbondment surfaces. Request the labora-tory to identify cause of disbondment.4.3 Paint with Solvent Od

19、or or Suspected Volatile Material:4.3.1 The important step in obtaining samples of paint filmsfor identification of retained solvents is to deposit the sample ina tightly closed container as quickly as possible. A septumtopvial is the preferred container. A screwtop vial or jar isacceptable. The via

20、l or jar should have the top removed priorto obtaining the sample.4.3.2 For samples of peeling paint, select an area of pooradhesion where the paint is not visually disbonded. Remove asample as described in 4.2.1. Place it immediately in thecontainer and screw the top tightly onto the vial or jar. D

21、o notreopen the jar. Other samples are to be placed in differentcontainers. Take a minimum of three samples.4.3.3 Record the location where the sample was obtained.Request the laboratory to identify the solvent odor.4.4 Sampling of Top Coat:4.4.1 It may be necessary to identify the generic coatingty

22、pe of a top coat in order to determine its compatibility withovercoating materials. There are the following three possiblesampling methods: paint chip, paint sanding, and paint scrap-ings.4.4.1.1 Paint Chip Method: If it is possible to obtain a paintchip, even if it contains multiple layers, the bes

23、t method is tolet the laboratory obtain a sample of the top coat. A sample atleast 10 cm (5-in.) square should be obtained. Identify the colorof the top coat if there is more than one layer in the paint chip.4.4.1.2 Paint Sanding Method: Sanding is used to obtainsamples of top coat of tightly adhere

24、nt coatings (or samples ofexposed coating) from a delaminated area. Clean the surface ofdust, dirt, and debris by washing with clean water and a rag.Fold a piece of paper lengthwise to make a trough, and tape itimmediately below the sampling location. Using a finegradesandpaper or emery cloth, rub t

25、he surface in a circular patternuntil enough coating to cover a fingernail has been removedfrom the surface. Examine the sampling location to determineif the top coat had been penetrated and the next coat is visible.(Discard the sample if the next coat is visible at the samplinglocation.) Place the

26、sample in a small vial. If no vial isavailable, take the paper and place the sample in the middle ofthe trough by lifting the ends of the trough. Fold the paper inthirds lengthwise, and then in half in the opposite direction.Place the paper in a plastic bag or envelope, and seal. Mark theoutside of

27、the bag or envelope with the identity of the sample,including date, name of person taking the sample, projectlocation, area location, and type of sample.4.4.1.3 Paint Scrapings Method: Scraping with a sharpblade is used to obtain samples of the top coat of tightlyadherent coatings (or samples of exp

28、osed coating) fromdelaminated areas. The procedure is the same as sanding excepta sharp blade such as a singleedge razor blade or utility knifeblade is used. The blade edge is held perpendicular to thesurface. The long edge of the blade is pressed with sufficientpressure over the surface so that tin

29、y pieces of the coating areremoved. However, greater care is needed when using a bladeas it is easier to cut into the coating and obtain small specimensof lower coating layers. The surface must be examined morecarefully after taking the sample to determine that the samplehas not been contaminated.4.

30、4.2 Document the sample location and method used toobtain the sample. Request the laboratory to identify thegeneric type of coating.5. Report5.1 Maintain field notes that include the following informa-tion: structure sampled, date, name of sampler, unique identi-fication number for each sample, loca

31、tion on the structure ofeach sample, location in coating film of failure (if applicable),dry film thickness measurements, film condition, and any otherobservations.5.2 When using a chainofcustody form, include uniqueidentification number, type of sample, number of samples, andtype of container for e

32、ach sample. Sign and date thechainofcustody form just prior to sealing the package, orwhen handing the package to the next person who takescustody.5.3 Provide information to the laboratory on tests to performor information desired using an analysis request form,chainofcustody form, or letter.6. Keyw

33、ords6.1 coating films; paint and coating; sampling methodsASTM 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 of any such pate

34、nt rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited eith

35、er for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair h

36、earing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6206032