1、Designation: D 6294 98 (Reapproved 2003)Standard Test Method forCorrosion Resistance of Ferrous Metal Fastener AssembliesUsed in Roofing and Waterproofing1This standard is issued under the fixed designation D 6294; the number immediately following the designation indicates the year oforiginal adopti
2、on or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers components of ferrous metalfastener assemblies, e
3、xcluding 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 thecomponents by determination of percentage of rust or whiterust.1.2 The compon
4、ents may or may not have a surface treat-ment applied.1.3 A limiting factor is the subjectiveness when determiningactual percentage of rust or white rust corrosion.1.4 Other performance characteristics of ferrous metal com-ponents such as abrasion resistance of barrier coatings are notevaluated in t
5、his method.1.5 This test method was developed based on Practice G 87.1.6 The values stated in SI units are to be regarded as thestandard. The inch-pound values given in parentheses may beapproximate, and are presented for information purposes.1.7 This standard does not purport to address all of thes
6、afety 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 Standards:D 16 Terminology for Paint, Re
7、lated Coatings, Materials,and Applications2D 1079 Terminology Relating to Roofing, Waterproofing,and Bituminous Materials3G 15 Terminology Relating to Corrosion and CorrosionTesting4G 87 Practice for Conducting Moist SO2Tests43. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this
8、test method, seeTerminology D 1079, G 15, and D 16.3.2 Definitions of Terms Specific to This Standard:3.2.1 barrierany 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 sur
9、face ofthe ferrous metal component is treated with a barrier coating toinhibit corrosion. Examples of barrier coatings for ferrousmetal components include galvanization, zinc plating with orwithout yellow or clear chromate sealer, cadmium, mechanicalzinc plating and organic or inorganic polymers.4.
10、Summary of Test Method4.1 This test method exposes ferrous metal specimens to 15or 30 (24) h cycles consisting of the 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
11、under vented conditions atcontrolled temperature and humidity.4.2 After drying, the test specimens are visually examinedto 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 m2(775 6 155 in.2).5. Sig
12、nificance and 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
13、 intheir early 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
14、 results are not to1This test method is under the jurisdiction of ASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved July 10, 2003. Published July 2003. Originallyapproved in 1998. Last previous e
15、dition approved in 1998 as D 6294 98.2Annual Book of ASTM Standards, Vol 06.01.3Annual Book of ASTM Standards, Vol 04.04.4Annual Book of ASTM Standards, Vol 03.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.be construed as a gene
16、ral 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 detect pores or other source
17、s 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 corrosion mecha-nisms such as
18、 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 of fasteners subjected tothis
19、 test method is evaluated.6. Apparatus6.1 The apparatus required for evaluating the corrosionresistance of the components consists of a test chamber5havingan internal capacity of 300 L (10.6 ft3), a supply of sulfurdioxide with metering device, specimen supports, provisionsfor heating the chamber, a
20、nd necessary means of control. Thesize and detailed construction of the apparatus shall be inaccordance with Section 4 of Practice G 87.7. Reagents7.1 The reagents, (that is, sulfur dioxide and water), theirpurity, and the means for introducing the sulfur dioxide into thetest chamber shall be in acc
21、ordance with Section 7 of PracticeG 87.8. 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 m2(755 6 155 in.2).8.2 It is allowable to mix the type of ferrous metal compo-nents (that is, fasteners,
22、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 between thelaboratory and cli
23、ent 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 controlsto aid in the test
24、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 to thismethod. The leng
25、th 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, lightweight insulating con-cr
26、ete, 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, in accordance with
27、 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/m3(30 pcf) lightweight ins
28、ulating 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 Cementitious Wood Fi
29、ber 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 for Gypsu
30、m 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 samp
31、le(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.8.4.8 For 8.4.3 through 8.4.6 install the fastener in apre-drilled plastic block such
32、 that the section previously driveninto the deck is not exposed. As an option and for non screwtype fasteners, the fasteners may be hung from 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
33、 in.) metal deckcoupon6having the following characteristics: 22 gage metalroof stock Grade E, painted, and cut edges are to be protectedwith paraffin wax, 2 mm (116 in.) 6 10 % from the steel couponedges.5Chambers available from Most Associates, 114 Waters Edge Drive. Jupiter, FL33477, and Atotech U
34、SA, 20026 Progress Drive, Strongville, OH 44136 have beenfound suitable for this purpose.6Suitable coupons are available from Wheeling Corrugated.D 6294 98 (2003)28.4.9.2 Using a variable speed screw gun, drive a fastener aminimum of 13 mm (0.5 in.) 6 10 % to a maximum of 19 mm(0.75 in.) 6 10 % into
35、 the metal coupon. For non screw typefasteners, drive the fasteners in accordance with the manufac-tures specifications 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 grad
36、eplywood. Using a variable Speed screw gun, drive a fastener 25mm (1 in.) 6 10 % into the plywood. For non screw typefasteners, drive fasteners in accordance with the manufacturesspecifications a minimum of 13 mm (0.5 in.) 6 10%toamaximum of 25 m (1 in.) 6 10 % into the deck.8.4.10.2 Remove the fast
37、ener from the plywood by breakingaway the plywood without damage to the section of thefastener not embedded into the 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 fastener
38、s, thefasteners may be hung from a glass rod with nylon wire tied tothe glass rod and directly under the fastener head.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 2mm(66116 in.).9.
39、Position of Specimens During Test9.1 Place the test specimens in the cabinet so that no part ofany specimen is within 20 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 bas
40、e of the chamber.9.2 Arrange the specimens so that moisture which maycondense on any of them or their supports will not fall 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 or
41、ientation (0 to 10 from the vertical) is suggested.10. Procedure10.1 The procedure shall be conducted according to Section9 of Practice G 87 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
42、.1.2 One test cycle is approximately 24 h of alternatingexposure to the sulfur dioxide environment for 8 6 0.25 h, anintermediate 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 1
43、6 6 0.25 h. For purpose of this test methodambient atmosphere is a temperature in the range of 20 to 30C(68 to 86F) and a relative humidity 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
44、 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 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 labo
45、ratory showing10, 15, 20, 30 % rust or white rust surface corrosion.11. Report11.1 Report the following information:11.1.1 Record the 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-
46、turer.11.1.3 Identify any surface treatment applied to specimenstested.11.1.4 Report any surface protection applied to bare edgesof 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 specim
47、ens tested.11.1.6.1 On Ferrous Metal Fasteners Driven into a MetalDeck CouponReport only the percentage of rust or whiterust, or both, 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 intoConcreteR
48、eport 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 ins
49、ulating concrete.11.1.6.4 On Ferrous Metal Fasteners Driven into Cementi-tious Wood FiberReport the percentage of rust or white rust,or both, showing in the area of the fastener above thecementitious wood fiber.11.1.6.5 On Ferrous Metal Fasteners Driven intoGypsumReport the percentage of rust or white rust, or both,showing in the area of the fastener above the gypsum.11.1.6.6 On Ferrous Metal Fasteners Driven intoPlywoodReport the percentage of rust or white rust, or both,showing in the area of the fastener above the plywood.11.1.6.7 On Ferrous Metal Stress P
