1、Designation:A1004/A1004M99(Reapproved 2014)Standard Practice forEstablishing Conformance to the Minimum ExpectedCorrosion Characteristics of Metallic,Painted-Metallic,andNonmetallic-Coated Steel Sheet Intended for Use as ColdFormed Framing Members1This standard is issued under the fixed designation
2、A1004/A1004M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapp
3、roval.1.Scope1.1 This practice covers procedures for establishing theacceptability of metallic-coated steel sheet,painted metallic-coated steel sheet and painted nonmetallic-coated steel sheetfor use as cold formed framing members.1.2 This practice shall be used to assess the corrosionresistance of
4、different coatings on steel sheet in a laboratorytest.It shall not be used as an application performance standardfor the cold formed framing members.1.3 The practice shall be used to evaluate coatings underconsideration for addition to Specification A1003/A1003M.1.4 The values stated in either inch-
5、pound or SI units are tobe regarded separately as standard.Within the text,the SI unitsare shown in brackets.The values stated in each system are notexact equivalents;therefore,each system must be used inde-pendently of the other.1.5 The text of this standard references notes and footnotesthat provi
6、de explanatory material.These notes and footnotes,excluding those in tables and figures,shall not be considered asrequirements of the standard.2.Referenced Documents2.1 ASTM Standards:2A902 Terminology Relating to Metallic Coated Steel Prod-uctsA1003/A1003M Specification for Steel Sheet,Carbon,Metal
7、lic-and Nonmetallic-Coated for Cold-FormedFraming MembersB117 Practice for Operating Salt Spray(Fog)ApparatusD714 Test Method for Evaluating Degree of Blistering ofPaintsD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive Environments3.Terminology3.1 For definitions
8、 of terms related to metallic-coated steelproducts,see Terminology A902.3.2 Definitions of Terms Specific to This Standard:3.2.1 red rust,nthe oxide formed when iron combineschemically with oxygen.3.2.2 red rust stains,nthe discoloration of the surface of acoated steel sheet caused by the bleeding o
9、f red rust fromadjacent areas.4.Summary of Practice4.1 This practice involves exposing flat and formed samplesof metallic-coated,painted metallic-coated and paintednonmetallic-coated steel sheet to a controlled saline environ-ment using Practice B117 and measuring the extent of corro-sion after a pr
10、edetermined time of exposure in the acceleratedtest.4.2 The samples exposed to the saline environment areprepared according to Test Method D1654.4.3 The maximum acceptable amount of corrosion allowedfor each material is described in Specification A1003/A1003M.5.Significance and Use5.1 This practice
11、is intended solely for the evaluation ofmetallic-coated,paintedmetallic-coated,andpaintednonmetallic-coated materials used for the manufacture of coldformed framing members.5.2 Correlation and extrapolation of corrosion performancebased on exposure to the test environment provided by PracticeB117 ar
12、e not always predictable.Correlation and extrapolationshould be considered only in cases where appropriate corrobo-rating long-term atmospheric exposures have been conducted.1This practice is under the jurisdiction of Committee A05 on Sheet Specifica-tions.Current edition approved May 1,2014.Publish
13、ed May 2014.Originallyapproved in 1999.Last previous edition approved in 2009 as A1004/A1004M-99(2009).DOI:10.1520/A1004_A1004M-99R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informat
14、ion,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 States1 5.3 This practice assesses whether coated materials notcurrently in Specification A1003/A1003M satisfy the requiredminimum
15、 corrosion characteristics.6.Procedure6.1 General Requirements:6.1.1 Select test panels from routine production materialensuring that the samples are representative of the material.Test panels with the normally applied surface coatings such aschemical treatment or oil,or both.6.1.2 The size of flat
16、test panels shall be 4 by 12 in.100 by300 mm.Formed panels shall be 4 by 12 in.100 by 300 mmor the actual production width,if smaller than the 4-in.100-mm width requirement.6.1.3 Orient test panels in the salt spray cabinet with the12-in.300-mm dimension in the vertical position.6.2 Metallic-Coated Products:6.2.1 Use Practice B117 to evaluate conformance with theminimum expected corrosion characteristics.6.2.2 Test at least three samples from three different pro-duction runs of a candidate produ
