1、Designation:D620609(Reapproved 2021)Standard Practice forSampling of Coating Films1This standard is issued under the fixed designation D6206;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 parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()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 analysi
3、s or 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 D5702.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are
4、for 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,health,and environmental practices and deter-mine the applicability of regulatory limitatio
5、ns prior to use.1.5 This international standard 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 Techn
6、icalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4840 Guide for Sample Chain-of-Custody ProceduresD5702 Practice for Field Sampling of Coating Films forAnalysis for Heavy Metals3.Significance and Use3.1 Specimens for analysis must be adequately sampled,packaged,and docu
7、mented to obtain meaningful 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 glove
8、s.Contact the laboratory 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 samplin
9、g.Document the samplinglocation 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
10、,and the color of the coatinglayer(s)where the delamination occurred.Document any othervisual defects such as alligatoring,mudcracking,checking,blistering,non-uniform appearance,or chalking.4.1.3 Obtain any history of the coating system available.This should include when the coating was applied,the
11、type ofcoating,and intended dry film thicknesses.Obtain a copy of thepainting specification,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 achain-of-custody form,especially if there are e
12、xisting orpotential legal ramifications to the results of the laboratoryanalysis.Guide D4840 presents the minimum requirements forsample chain-of-custody 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
13、 incision approximately 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.Alternatively,it may be possible to remove the sample bycutting a 5 cm(2-in.)square in the coati
14、ng and peeling asample by inserting the knife blade held at a low angle to thesurface at one of the edges of the incision.For brittle coatings,masking tape may be used to hold the film together duringremoval.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,
15、Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 1997.Last previous edition approved in 2015 as D6206 09(2015).DOI:10.1520/D6206-09R21.2For referenced
16、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 Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelop