1、Designation: D6294/D6294M 98 (Reapproved 2009)1Standard Test Method forCorrosion Resistance of Ferrous Metal Fastener AssembliesUsed in Roofing and Waterproofing1This standard is issued under the fixed designation D6294/D6294M; the number immediately following the designation indicates theyear of or
2、iginal 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 reapproval.1NOTEEditorially corrected the units of measure in December 2009.1. Scope
3、1.1 This test method covers components of ferrous metalfastener assemblies, excluding those of stainless steel, such asfasteners, stress plates, and batten bars used in low sloperoofing and waterproofing, to a sulfurous acid environment.This test method evaluates relative corrosion resistance of the
4、components by determination of percentage of rust or whiterust.1.2 The components may or may not have a surface treat-ment applied.1.3 Alimiting factor is the subjectiveness when determiningactual percentage of rust or white rust corrosion.1.4 Other performance characteristics of ferrous metal com-p
5、onents such as abrasion resistance of barrier coatings are notevaluated in this method.1.5 This test method was developed based on Practice G87.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equi
6、valents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user o
7、f 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 Standards:2D16 Terminology for Paint, Related Coatings, Materials,and ApplicationsD1079 Terminology Relating to Roofing and Wa
8、terproofingG15 Terminology Relating to Corrosion and CorrosionTestingG87 Practice for Conducting Moist SO2Tests3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, seeTerminology D1079, G15, and D16.3.2 Definitions of Terms Specific to This Standard:3.2.1 barrierany
9、 material limiting passage through itselfof solids, liquids, semi-solids, gases, vapors, or forms ofenergy such as ultraviolet light.3.2.2 surface treatmenta process by which the surface ofthe ferrous metal component is treated with a barrier coating toinhibit corrosion. Examples of barrier coatings
10、 for ferrousmetal components include galvanization, zinc plating with orwithout yellow or clear chromate sealer, cadmium, mechanicalzinc plating and organic or inorganic polymers.4. Summary of Test Method4.1 This test method exposes ferrous metal specimens to 15or 30 (24) h cycles consisting of the
11、following:4.1.1 Eight (8) h exposure to the sulfur dioxide atmospherein a closed chamber.4.1.2 An intermediate step of rinsing with distilled water,and4.1.3 Sixteen (16) h of drying under vented conditions atcontrolled temperature and humidity.4.2 After drying, the test specimens are visually examin
12、edto evaluate the percentage of rust or white rust that formed onthe surface.4.3 The total surface area of the components exposed in thechamber is 0.5 6 0.1 m2775 6 155 in.2.1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility
13、of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved Dec. 1, 2009. Published December 2009. Originallyapproved in 1998. Last previous edition approved in 1998 as D6294 98. DOI:10.1520/D6294_D6294M-98R09E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or
14、contact 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 19428-2959, United States.5. Significance an
15、d Use5.1 It is important to evaluate the corrosion resistance offerrous metal components used in low-slope roofing andwaterproofing because they provide integrity and securementof other system components, such as insulation and mem-branes. Corrosion of ferrous metal components may result intheir ear
16、ly deterioration and may lead to roofing or waterproof-ing system failure.5.2 Results from testing ferrous metal components in anacidic atmosphere serve as an indication of the relativecorrosion resistance of such components, coated or uncoated,to the environment of the test chamber. The results are
17、 not tobe construed as a general guideline to the corrosion resistanceof such components in other environments or in usage that maybe conducive to corrosion.5.3 Moist air containing sulfur dioxide quickly produceseasily visible corrosion on many ferrous metals. It is thereforea test medium suited to
18、 detect pores or other sources ofweakness in protective barrier coatings.5.4 This test method applies primarily to evaluating theeffectiveness of barrier coatings to provide general corrosionprotection under test conditions. It is not intended to evaluatethe resistance of the components to specific
19、corrosion mecha-nisms such as crevice, galvanic, or stress corrosion.5.5 This test method does not address abrasion resistance ofbarrier coatings when the fasteners are driven through aboveroof deck components, such as an existing built-up roof orinsulations, or both.5.6 Only the above deck portion
20、of fasteners subjected tothis test method is evaluated.6. Apparatus6.1 The apparatus required for evaluating the corrosionresistance of the components consists of a test chamber3havingan internal capacity of 300 L 10.6 ft3, a supply of sulfurdioxide with metering device, specimen supports, provision
21、sfor heating the chamber, and necessary means of control. Thesize and detailed construction of the apparatus shall be inaccordance with Section 4 of Practice G87.7. Reagents7.1 The reagents, (that is, sulfur dioxide and water), theirpurity, and the means for introducing the sulfur dioxide into thete
22、st chamber shall be in accordance with Section 7 of PracticeG87.8. Test Specimen8.1 Select the number of test specimens such that the totalcombined exposed surface area of the specimens at any onetime shall be 0.5 6 0.1 m2755 6 155 in.2.8.2 It is allowable to mix the type of ferrous metal compo-nent
23、s (that is, fasteners, stress plates, an batten bars) in the testchamber, provided that the different components do not havevastly different resistance to corrosion under test conditions.The different types of components that may be evaluated in thechamber simultaneously are to be agreed upon betwee
24、n thelaboratory and client requesting the test.NOTE 1The laboratory may have to conduct preliminary cycling teststo estimate the relative resistance of each component.NOTE 2Specimens may be produced by the laboratory showing 10,15, 20, and 30 % rust or white rust surface corrosion to be used as cont
25、rolsto aid in the test result evaluation in accordance with 10.1.3 and 11.1.6.8.3 To obtain quantitative corrosion-rate data, only ferrousmetal components with similar reactivities should be includedin a test run.8.4 Roof Fastener Test Specimens:8.4.1 Fasteners of any length may be tested according
26、to thismethod. The length is to be agreed upon between the laboratoryand client.8.4.2 Roof fasteners are evaluated in this method in relationto deck materials into which they are expected to be installedin service. For purposes of this test method, these deckmaterials are structural concrete, lightw
27、eight insulating con-crete, cementitious wood fiber, gypsum, metal, and wood.Prepare the fastener test specimens as follows:8.4.3 Fasteners for Concrete Decks:8.4.3.1 Use nominal 20.7 MPa 3000 lb/in2 75 mm 3 in.minimum thickness concrete deck that has cured a minimum of28 days. Install the fastener,
28、 in accordance with the manufac-tures specifications, a minimum of 25 mm 1 in. 6 10 % intothe deck.8.4.3.2 Use a separate hole location on the deck sample(s)for each fastener.8.4.4 Fasteners for Lightweight Insulating Concrete Decks:8.4.4.1 Use 75 mm 3 in. minimum thickness nominal 480kg/m330 pcf li
29、ghtweight insulating concrete deck that hascured a minimum 28 days. Install the fastener, in accordancewith the manufactures specifications, a minimum of 25 mm 1in. 6 10 % into the deck.8.4.4.2 Use a separate hole location on the concrete decksample(s) for each fastener.8.4.5 Fasteners for Cementiti
30、ous Wood Fiber Decks:8.4.5.1 Use 75 mm 3 in. minimum thickness cementitiouswood fiber deck. Install the fastener, in accordance withmanufactures specifications, a minimum of 25 mm 1 in. 610 % into the deck.8.4.5.2 Use a separate hole location on the deck sample(s)for each fastener.8.4.6 Fasteners fo
31、r Gypsum Decks:8.4.6.1 Use 75 mm 3 in. minimum thickness pouredgypsum deck that has cured a minimum of 28 days to amaximum 90 days. Install the fastener, in accordance with themanufactures specifications, a minimum of 25 mm 1 in. 610 % into the deck.8.4.6.2 Use a separate hole location on the deck s
32、ample(s)for each fastener.8.4.7 For the decks referenced in 8.4.3 through8.4.6 removethe fastener from the deck using care by breaking away thedeck without damage to the section of the fastener notembedded in the deck.3The sole source of supply of the apparatus known to the committee at this timeis
33、Most Associates, 114 Waters Edge Drive. Jupiter, FL 33477, and Atotech USA,20026 Progress Drive, Strongville, OH 44136. If you are aware of alternativesuppliers, please provide this information to ASTM International Headquarters.Your comments will receive careful consideration at a meeting of the re
34、sponsibletechnical committee,1which you may attend.D6294/D6294M 98 (2009)128.4.8 For 8.4.3 through 8.4.6 install the fastener in apre-drilled plastic block such that the section previously driveninto the deck is not exposed. As an option and for non screwtype fasteners, the fasteners may be hung fro
35、m a glass rod withnylon wire tied to the glass rod and directly under the fastenerhead.8.4.9 Fasteners for Metal Decks:8.4.9.1 Use a nominal 75 by 75 mm 3 by 3 in. metal deckcoupon4having the following characteristics: 22 gage metalroof stock Grade E, painted, and cut edges are to be protectedwith p
36、araffin wax, 2 mm 116 in. 6 10 % from the steel couponedges.8.4.9.2 Using a variable speed screw gun, drive a fastener aminimum of 13 mm 0.5 in. 6 10 % to a maximum of 19 mm0.75 in. 6 10 % into the metal coupon. For non screw typefasteners, drive the fasteners in accordance with the manufac-tures sp
37、ecifications a minimum of 13 mm 0.5 in. 6 10 % toa maximum of 19 mm 0.75 in. 6 10 % into the metal coupon.8.4.10 Fasteners for Wood Decks:8.4.10.1 Use nominal 19 mm 0.75 in. exterior gradeplywood. Using a variable Speed screw gun, drive a fastener 25mm 1 in. 6 10 % into the plywood. For non screw ty
38、pefasteners, drive fasteners in accordance with the manufacturesspecifications a minimum of 13 mm 0.5 in. 6 10 % to amaximum of 25 m 1 in. 6 10 % into the deck.8.4.10.2 Remove the fastener from the plywood by breakingaway the plywood without damage to the section of thefastener not embedded into the
39、 plywood.8.4.10.3 Install the fastener in a predrilled plastic block suchthat the section previously driven into the plywood is notexposed. As an option and for non screw type fasteners, thefasteners may be hung from a glass rod with nylon wire tied tothe glass rod and directly under the fastener he
40、ad.8.5 Roof Stress Plate Test SpecimensStress plates shall beused as supplied.8.6 Roof Batten Bar Test SpecimensBatten-bar specimensshall be cut to a length of 150 6 2mm66116 in.9. Position of Specimens During Test9.1 Place the test specimens in the cabinet so that no part ofany specimen is within 2
41、0 6 2 mm 0.78 in. 6 10 % ofanother, or within 100 6 10 mm 3.9 in. 6 10 % of the wallsor the ceiling, or within 200 6 20 mm 7.9 in. 6 10 % of thesurface of the water in the base of the chamber.9.2 Arrange the specimens so that moisture which maycondense on any of them or their supports will not fall
42、on theother specimens placed at lower levels.9.3 Unless otherwise agreed upon, the angle of inclinationof test surfaces to the vertical is optional. However, a nearvertical orientation (0 to 10 from the vertical) is suggested.10. Procedure10.1 The procedure shall be conducted according to Section9 o
43、f Practice G87 with the following exceptions or additionalrequirements.10.1.1 Introduce 2 6 0.2 L 0.5 gal 6 10 % of sulfurdioxide into the chamber through the inlet pipe.10.1.2 One test cycle is approximately 24 h of alternatingexposure to the sulfur dioxide environment for 8 6 0.25 h, anintermediat
44、e step of rinsing (see 10.1.3) with a minimum of1000 mL of clean distilled water at 30 6 8C 86 6 14F,followed by drying in the ambient temperature inside thechamber for 16 6 0.25 h. For purpose of this test methodambient atmosphere is a temperature in the range of 20 to 30C68 to 86F and a relative h
45、umidity below 75 % (6 10 %).10.1.3 Each individual component is rinsed by a gentle backand forth motion while the component is immersed in thewater.NOTE 3Rinsing for 15 to 30 s is intended to remove staining which isnot part of corrosion.10.1.4 After rinsing and the test samples have been allowedto
46、dry, visually estimate the percent of rust or white rust surfacecorrosion. As an aid, test samples may be compared to controlspecimens which may be produced by the laboratory showing10, 15, 20, 30 % rust or white rust surface corrosion.11. Report11.1 Report the following information:11.1.1 Record th
47、e date the test commenced and the date thetest ended.11.1.2 Record complete identification of specimens tested,including number of specimens, type, source, and manufac-turer.11.1.3 Identify any surface treatment applied to specimenstested.11.1.4 Report any surface protection applied to bare edgesof
48、specimens tested.11.1.5 Identify whether the test was run for 15 or 30 cycles.11.1.6 Report findings in terms of percentage of rust orwhite rust, or both, on the specimens tested.11.1.6.1 On Ferrous Metal Fasteners Driven into a MetalDeck CouponReport only the percentage of rust or whiterust, or bot
49、h, showing in the area of the fastener above themetal deck coupon into which the fastener was driven fortesting.11.1.6.2 On Ferrous Metal Fasteners Driven intoConcreteReport the percentage of rust or white rust, or both,showing in the area of the fastener above the concrete.11.1.6.3 On Ferrous Metal Fasteners Driven into Light-weight Insulating ConcreteReport the percentage of rust orwhite rust, or both, showing in the area of the fastener abovethe lightweight insulating concrete.11.1.6.4 On Fer
