1、Designation: A 1004/A 1004M 99 (Reapproved 2004)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 desig
2、nation A 1004/A 1004M; 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 (e) indicates an editorial change since the last
3、revision 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 corr
4、osionresistance 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 A 1003/A 1003M.1.4 The values
5、stated 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 no
6、tes and 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:2A 902 Terminology Relating to Metallic Coated Steel Prod-uctsA 1003/A 1003M Specifica
7、tion for Steel Sheet, Carbon,Metallic and Non-Metallic Coated for Cold Formed Fram-ing MembersB 117 Practice for Operating Salt Spray (Fog) TestingApparatusD 714 Test Method for Evaluating Degree of Blistering ofPaintsD 1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corro
8、sive Environments3. Terminology3.1 For definitions of terms related to metallic-coated steelproducts, see Terminology A 902.3.2 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 s
9、urface ofa coated steel 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 Practic
10、e B 117 and measuring the extent ofcorrosion after a predetermined time of exposure in theaccelerated test.4.2 The samples exposed to the saline environment areprepared according to Test Method D 1654.4.3 The maximum acceptable amount of corrosion allowedfor each material is described in Specificati
11、on A 1003/A1003M.5. Significance 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 o
12、n exposure to the test environment provided by PracticeB 117 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 M
13、etallic-CoatedIron and Steel Products and is the direct responsibility of Subcommittee A05.11 onSheet Specifications.Current edition approved May 1, 2004. Published June 2004. Originallyapproved in 1999. Last previous edition approved in 1999 as A 1004/A 1004M - 99.2For referenced ASTM standards, vi
14、sit 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-
15、2959, United States.5.3 This practice assesses whether coated materials notcurrently in Specification A 1003/A 1003M satisfy the requiredminimum corrosion characteristics.6. Procedure6.1 General Requirements:6.1.1 Select test panels from routine production materialensuring that the samples are repre
16、sentative 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 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.10
17、0-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 B 117 to evaluate conformance with theminimum expected corrosion characteristics.6.2.2 Test at least three samples from t
18、hree different pro-duction runs of a candidate product.6.2.3 Protect the edges of all test 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
19、 Test for 100 h for Type H and Type L materials or 75h for Type NS material.6.2.6 Loss of 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.
20、Remove the red ruststain before evaluating the test panel.NOTE 1The test criteria for metallic-coated products are listed inSpecification A 1003/A 1003M.6.3 Painted Metallic-Coated:6.3.1 Use Practice B 117 to establish the minimum expectedcorrosion characteristics.6.3.2 Test at least three samples f
21、rom three different pro-duction runs of a candidate product.6.3.3 The metallic-coated substrate 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
22、 scribe shall beat an angle of 30 to the longest panel (12 in. 300 mm)dimension.6.3.5 Protect 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 crite
23、ria for painted metallic-coated product are listedin Specification A 1003/A 1003M.6.3.7 Evaluate the mean creepage in accordance with TestMethod D 1654.6.3.8 Evaluate the blisters in accordance with Test MethodD 714.6.4 Painted Nonmetallic-Coated Products:6.4.1 Use Practice B 117 to establish the mi
24、nimum expectedcorrosion characteristics.6.4.2 Test at least three samples from three different pro-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 pa
25、nel (12 in. 300mm) dimension.6.4.4 Protect the edges of all test panels from exposure tothe salt 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 A 1003/A 1003M.6.4.6 Evaluate the mean cr
26、eepage in accordance with TestMethod D 1654.6.4.7 Evaluate the blisters in accordance with Test MethodD 714.7. Report7.1 Subcommittee A05.11 will consider the addition ofcoating systems not currently referenced in SpecificationA 1003/A 1003M through the review of results of tests con-ducted accordin
27、g to this practice.8. Keywords8.1 corrosion; metallic-coated sheet; painted metallic-coated sheet; painted nonmetallic-coated sheet; salt spray;sheet steelA 1004/A 1004M 99 (2004)2APPENDIX(Nonmandatory Information)X1. GENERAL INFORMATION ON THE SIGNIFICANCE AND USE OF SALT SPRAY TESTINGX1.1 Practice
28、 B 117, salt spray (fog) testing, is commonlyused to assess the relative corrosion resistance of a coated 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 coatedprod
29、ucts. As stated in that standard Practice B 117 describesthe apparatus, procedure, and conditions required to 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 interpretatio
30、nto be given to the results. The practice provides a controlledcorrosive environment that has been utilized to produce rela-tive corrosion resistance information for specimens of metalsand coated metals in any particular test chamber. Consequently,users of Practice B 117 must describe specific infor
31、mation onthe test specimens such as size, degree of exposed surface(edges protected or not), and localization 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 protect
32、ive film, or loss ofcoating to rust. Development of these criteria must consider thecorrosion resistance mechanism of the product under test, forexample, galvanic protection or barrier protection.X1.2 Industry experience with Practice B 117 has resultedin a body of knowledge of the testing protocols
33、 and test criteriafor specific products. The requirements contained in AnnexesA1.1, A2.1 and A2.2 of Practice B 117 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,
34、 salt spray testing shouldnot be used to predict service performance, nor should it beused to rank dissimilar materials. 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
35、 any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity 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 techni
36、cal committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideratio
37、n at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have 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 Harb
38、or Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple 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).A 1004/A 1004M 99 (2004)3
