ASTM A1004 A1004M-1999(2014) Standard Practice for Establishing Conformance to the Minimum Expected Corrosion Characteristics of Metallic Painted-Metallic and Nonmetallic-Coated St.pdf

1、Designation: A1004/A1004M 99 (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 designa

2、tion 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 revis

3、ion or reapproval.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 corrosion

4、resistance of 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

5、in either inch-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

6、 footnotesthat provide 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 S

7、teel Sheet, Carbon,Metallic- 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. Te

8、rminology3.1 For definitions 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

9、 sheet caused by the bleeding of 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 th

10、e extent of corro-sion after a predetermined 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. Sign

11、ificance and Use5.1 This practice is intended solely for the evaluation ofmetallic-coated, painted metallic-coated, and paintednonmetallic-coated materials used for the manufacture of coldformed framing members.5.2 Correlation and extrapolation of corrosion performancebased on exposure to the test e

12、nvironment provided by PracticeB117 are 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.Curr

13、ent edition approved May 1, 2014. Published 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.or

14、g. 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 States15.3 This practice assesses whether coated materials notcurrently i

15、n Specification A1003/A1003M satisfy the requiredminimum 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 as

16、chemical treatment or oil, or both.6.1.2 The size of flat 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.

17、 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 product.6.2.3 Protect the edges of all tes

18、t panels from exposure tothe salt solution.6.2.4 Metallic-coated materials shall satisfy the minimumcorrosion characteristics of G60 Z180 for the Type H andType L steels and G40 Z120 for the Type NS steels.6.2.5 Test for 100 h for Type H and Type L materials or 75h for Type NS material.6.2.6 Loss of

19、 coating is indicated by the appearance of redrust in areas devoid of any metallic coating. The products ofoxidation combined with the salt solution have a tendency tocoat the test sample with a red rust stain. Remove the red ruststain before evaluating the test panel.NOTE 1The test criteria for met

20、allic-coated products are listed inSpecification A1003/A1003M.6.3 Painted Metallic-Coated:6.3.1 Use Practice B117 to establish the minimum expectedcorrosion characteristics.6.3.2 Test at least three samples from three different pro-duction runs of a candidate product.6.3.3 The metallic-coated substr

21、ate of the painted metallic-coated steel sheet shall satisfy the test requirements describedin 6.26.3.4 Painted metallic-coated test panels shall have a scribethat penetrates the nonmetallic coating only. The scribe shall beat an angle of 30 to the longest panel (12 in. 300 mm)dimension.6.3.5 Protec

22、t the edges of all test panels from exposure tothe salt solution.6.3.6 Test for 500 h to establish conformance to the mini-mum expected corrosion characteristics of the nonmetalliccoating.NOTE 2The test criteria for painted metallic-coated product are listedin Specification A1003/A1003M.6.3.7 Evalua

23、te the mean creepage in accordance with TestMethod D1654.6.3.8 Evaluate the blisters in accordance with Test MethodD714.6.4 Painted Nonmetallic-Coated Products:6.4.1 Use Practice B117 to establish the minimum expectedcorrosion characteristics.6.4.2 Test at least three samples from three different pr

24、o-duction lots of a candidate material.6.4.3 Painted nonmetallic-coated test panels shall have ascribe that penetrates the nonmetallic coating only. The scribeshall be at an angle of 30 to the longest panel (12 in. 300mm) dimension.6.4.4 Protect the edges of all test panels from exposure tothe salt

25、solution.6.4.5 Test for 250 h to establish conformance to require-ments.NOTE 3The test criteria for painted nonmetallic-coated product arelisted in Specification A1003/A1003M.6.4.6 Evaluate the mean creepage in accordance with TestMethod D1654.6.4.7 Evaluate the blisters in accordance with Test Meth

26、odD714.7. Report7.1 Subcommittee A05.11 will consider the addition ofcoating systems not currently referenced in SpecificationA1003/A1003M through the review of results of tests con-ducted according to this practice.8. Keywords8.1 corrosion; metallic-coated sheet; painted metallic-coated sheet; pain

27、ted nonmetallic-coated sheet; salt spray;sheet steelA1004/A1004M 99 (2014)2APPENDIX(Nonmandatory Information)X1. GENERAL INFORMATION ON THE SIGNIFICANCE AND USE OF SALT SPRAY TESTINGX1.1 Practice B117, salt spray (fog) testing, is commonlyused to assess the relative corrosion resistance of a coated

28、steelproduct through the use of a controlled corrosive environment.The practice, however, is sometimes mistakenly considered tobe a guide for the evaluation of corrosion resistance of coatedproducts.As stated in that standard Practice B117 describes theapparatus, procedure, and conditions required t

29、o create andmaintain the salt spray (fog) test environment. The practicedoes not prescribe the type of test specimen or exposureperiods to be used for a specific product, nor the interpretationto be given to the results. The practice provides a controlledcorrosive environment that has been utilized

30、to produce rela-tive corrosion resistance information for specimens of metalsand coated metals in any particular test chamber. Consequently,users of Practice B117 must describe specific information onthe test specimens such as size, degree of exposed surface(edges protected or not), and localization

31、 of corrosion with ascribe through the coating. The users must also define the “endof test” criteria. Examples of these criteria include: onset offirst rust, degree of delamination of protective film, or loss ofcoating to rust. Development of these criteria must consider thecorrosion resistance mech

32、anism of the product under test, forexample, galvanic protection or barrier protection.X1.2 Industry experience with Practice B117 has resulted ina body of knowledge of the testing protocols and test criteriafor specific products. The requirements contained in AnnexesA1.1, A2.1 and A2.2 of Practice

33、B117 reflect this experience.X1.3 While the limitations of salt spray testing are widelyrecognized, the test remains in use, especially as a qualitycontrol tool. Because of its limitations, salt spray testing shouldnot be used to predict service performance, nor should it beused to rank dissimilar m

34、aterials. Its use should be limited toprocess qualification and quality control.ASTM 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 val

35、idity of any such patent 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 com

36、ments are invited either 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

37、 not received a fair hearing 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

38、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A1004/A1004M 99 (2014)3