ASTM_D_4417_-_14.pdf

Designation:D441714Standard Test Methods forField Measurement of Surface Profile of Blast CleanedSteel1This standard is issued under the fixed designation D4417;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the description of techniquesfor measuring the profile of abrasive blast cleaned surfaces inthe laboratory,field,or in the fabricating shop.There areadditional techniques suitable for laboratory use not covered bythese test methods.1.2 Method B may also be appropriate to the measurementof profile produced by using power tools.1.3 SSPC standard SSPC PA 17 provides additional guid-ance for determining conformance with surface profile require-ments.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D7127 Test Method for Measurement of Surface Roughnessof Abrasive Blast Cleaned Metal Surfaces Using a Por-table Stylus InstrumentE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 SSPC Standard:3SSPC PA 17 Procedure for Determining Conformance toSteel Profile/Surface Roughness/Peak Count Require-ments3.Summary of Test Method3.1 The methods are:3.1.1 Method AThe blasted surface is visually comparedto standards prepared with various surface profile depths andthe range determined.3.1.2 Method BThe depth of profile is measured using afine pointed probe at a number of locations and the arithmeticmean of the maximum peak-to-valley distances is determined.3.1.3 Method CA composite plastic tape is impressed intothe blast cleaned surface forming a reverse image of the profile,and the maximum peak to valley distance measured withthickness gage specifically designed for use with the replicatape method.4.Significance and Use4.1 The height of surface profile has been shown to be afactor in the performance of various coatings applied to steel.For this reason,surface profile should be measured prior tocoating application to ensure that it meets that specified.Theinstruments described are readily portable and sufficientlysturdy for use in the field.NOTE1Optical microscope methods serve as a referee method forsurface profile measurement methods A and B.Profile depth designationsare based on the concept of mean maximum profile(hmax);this value isdetermined by averaging a given number(usually 20)of the highest peakto lowest valley measurements made in the field of view of a standardmeasuring microscope.This is done because of evidence that coatingsperformance in any one small area is primarily influenced by the highestsurface features in that area and not by the average roughness.45.Apparatus5.1 Method AAprofile comparator consisting of a numberof areas(each approximately one square inch in size),usually1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.46 on Industrial Protective Coatings.Current edition approved Jan.1,2014.Published March 2014.Originallyapproved in 1984.Last previous edition approved in 2011 as D4417 11.DOI:10.1520/D4417-14.2For 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.3Available from Society for Protective Coatings(SSPC),40 24th St.,6th Floor,Pittsburgh,PA 15222-4656,http:/www.sspc.org.4John D.Keane,Joseph A.Bruno,Jr.,Raymond E.F.Weaver,“Surface Profilefor Anti-Corrosion Paints,”Oct.25,1976,Steel Structures Painting Council,4400Fifth Ave.,Pittsburgh,PA 15213.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 side by side,with a different profile or anchor pattern depth.Each area is marked giving the nominal profile depth in mils ormicrometres.Typical comparator surfaces are prepared withsteel shot,steel grit,or sand or other nonmetallic abrasive,since the appearance of the profile created by these abrasivesmay differ.The comparator areas are used with or withoutmagnification of 5 to 10 power.5.2 Method BA depth micrometer fitted with a pointedprobe.The probe is ty