ASTM_D_610_-_08_2012.pdf

Designation:D61008(Reapproved 2012)Society for Protective CoatingsSSPC-VIS-2Standard Practice forEvaluating Degree of Rusting on Painted Steel Surfaces1This standard is issued under the fixed designation D610;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 Department of Defense.1.Scope1.1 This practice covers the evaluation of the degree ofrusting on painted steel surfaces.The visual examples whichdepict the percentage of rusting given in the written specifica-tions form part of the standard.In the event of a dispute,thewritten definition prevails.These visual examples were devel-oped in cooperation with SSPC:The Society for ProtectiveCoatings to further standardization of methods.The photo-graphs can be used to estimate the percentage of other coatingdefects on various substrates.This standard does not includeevaluation of rust propagation around an initially preparedscribe,score,or holiday.1.2 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 use.2.Referenced Documents2.1 ASTM Adjunct/SSPC:The Society for Protective Coat-ings:SSPC-VIS 2/ASTM D610 Standard Method of EvaluatingDegrees of Rusting on Painted Steel Surfaces23.Significance and Use3.1 The amount of rusting beneath or through a paint film isa significant factor in determining whether a coating systemshould be repaired or replaced.This practice provides astandardized means for quantifying the amount and distributionof visible surface rust.3.2 The degree of rusting is evaluated using a zero to tenscale based on the percentage of visible surface rust.3.3 The distribution of the rust is classified as spot rust,general rust,pinpoint rust or hybrid rust.4.Interferences4.1 The visual examples that are part of this practice and theassociated rust-grade scale cover only rusting evidenced byvisible surface rust.4.2 The use of the visual examples requires the followingcautions:4.2.1 Some finishes are stained by rust.This staining mustnot be confused with the actual rusting involved.4.2.2 Accumulated dirt or other material may make accuratedetermination of the degree of rusting difficult.4.2.3 Certain types of deposited dirt that contain iron or ironcompounds may cause surface discoloration that should not bemistaken for corrosion.4.2.4 Failure may vary over a given area.Discretion musttherefore be used when selecting a single rust grade or rustdistribution that is to be representative of a large area orstructure,or in subdividing a structure for evaluation.4.2.5The color of the finish coating should be taken intoaccount in evaluating surfaces as failures will be more apparenton a finish that shows color contrast with rust,such as used inthese reference standards,than on a similar color,such as aniron oxide finish.5.Procedure5.1 Select an area to be evaluated.5.2 Determine the type of rust distribution using definitionsin Table 1 and visual examples in Fig.1,Fig.2,and Fig.3.5.3 Estimate percentage of surface area rusted using thevisual examples in Fig.1,Fig.2,and Fig.3 or SSPC-VIS 2,orboth,by electronic scanning techniques or other method agreedupon by contracting parties.5.4 Do not consider flow of corrosion products onto thesurface of intact coating(that is,“rust bleed”or staining)as1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.25 on Evaluation of Weathering Effects.This practice has been jointly approved by ASTM and SSPC:The Society forProtective Coatings.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1941.Last previous edition approved in 2008 as D610 08.DOI:10.1520/D0610-08R12.2Colored visual examples are available at a nominal cost from ASTM Interna-tional Headquarters(request Adjunct ADJD0610A),SSPC Publication No.00-08from The Society for Protective Coatings(SSPC),40 24th St.,6th Floor,Pittsburgh,PA 15222-4656,http:/www.sspc.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 part of the surface area rust.It may be helpful to wipe thesurface with a damp cloth to remove the rust bleed beforeevaluating.5.5 Use percentage of surface area rusted to identify rustgrade(see Table 1).Assign rust rating using rust grade of 0-10followed by the type of rust distribution identified by S forspot,G for general,P for pinpoint or H for Hybrid.NOTE1The numerical rust grade scale is an exponential function ofthe area of rust.Plottin