ASTM D7087-2005a Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments《用成像技术在腐蚀环境中测量涂覆试验板划痕处锈蚀蠕.pdf
《ASTM D7087-2005a Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments《用成像技术在腐蚀环境中测量涂覆试验板划痕处锈蚀蠕.pdf》由会员分享,可在线阅读,更多相关《ASTM D7087-2005a Standard Test Method for An Imaging Technique to Measure Rust Creepage at Scribe on Coated Test Panels Subjected to Corrosive Environments《用成像技术在腐蚀环境中测量涂覆试验板划痕处锈蚀蠕.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7087 05aStandard Test Method forAn Imaging Technique to Measure Rust Creepage at Scribeon Coated Test Panels Subjected to CorrosiveEnvironments1This standard is issued under the fixed designation D 7087; the number immediately following the designation indicates the year oforiginal ad
2、option 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 the measurement of rust creep-age area from a
3、 scribe line on painted/coated flat test panelsafter exposure to corrosive environments. This test method hasthe advantage of simplicity and ease of use. Expensive equip-ment is not required, and the results are more accurate thanvisual evaluation but not as precise as advanced digitalimaging.1.2 Th
4、is test method uses visual imaging software to deter-mine the area damaged by rust creepage from the scribe.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety conc
5、erns, 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:2B117 Practice for Operating Salt Spray
6、(Fog) ApparatusD 1014 Practice for Conducting Exterior Exposure Tests ofPaints and Coatings on Metal SubstratesD 1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsD 4585 Practice for Testing Water Resistance of CoatingsUsing Controlled CondensationD 458
7、7 Practice for Fluorescent UV-Condensation Expo-sure of Paint and Related CoatingsD 5894 Practice for Cyclic Salt Fog/UV Exposure ofPainted Metal, (Alternating Exposures in a Fog/Dry Cabi-net and a UV/Condensation Cabinet)D 6695 Practice for Xenon-Arc Exposures of Paint andRelated CoatingsG85 Practi
8、ce for Modified Salt Spray (Fog) Testing3. Significance and Use3.1 This test method provides a means of evaluating andcomparing development of corrosion at scribe on painted/coated flat test panels after exposure to corrosive environ-ments.4. Apparatus4.1 Transparent Plastic SheetUse transparent pla
9、sticsheet with thickness approximately 0.085 mm (0.0034 in. or3.4 mil). The sheet material must be transparent enough foreasy tracing and must be sufficiently absorbent to provide goodink adhesion.34.2 Tracing PenA black permanent marker with ultrafinetip approximately 0.5 mm (0.02 in.) in diameter.
10、4.3 RulerAny transparent ruler with 1-mm black divi-sions. This length shall be shorter than either length or width ofglass surface of scanner.4.4 Computer and Scanning SystemAny computer andcompatible scanning system is applicable. A computer with atleast 32 MB of RAM is recommended.4Aflat bed scan
11、ner with1200 dpi optical, 120032400 dpi hardware resolution issuggested. The scanner must have a feature where it selects thebest possible resolution required for scanning. There is no needto calibrate or change settings while scanning.4.5 Image SoftwareUse any image software capable ofreading an im
12、age file generated from the computer andscanning system, calibrating length, and integrating area rap-idly and accurately.5. Specimen Scribing5.1 Scribe test specimens in accordance with Test MethodD 1654, section on Preliminary Treatment of Test Specimens.The panels should be scribed in a single st
13、raight line.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.25 on Evaluation of Weathering Effects.Current edition approved July 1, 2005. Published July 2005. Originally ap
14、provedin 2005. Last previous edition approved in 2005 as D 7087 05.2For referenced ASTM standards, visit 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 we
15、bsite.3The transparent plastic sheet material of one-gallon size zipper freezer bagwithout surface texture was found acceptable in round robin testing.4A PC compatible computer with the Windows 95, Windows 98, Windows ME,Windows NT, Windows 2000 or Windows XP operating system is applicable.1Copyrigh
16、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Exposure of Test Specimens6.1 Prior to exposure, measure the width of the scribe.Record this information.6.2 Expose test specimens in accordance with any of thefollowing Practices B117, D 101
17、4, D 4585, D 4587, D 5894,D 6695, and G85, or any other applicable test method, asagreed upon between the producer and the user. The exposurecycle, length of test and evaluation intervals shall be agreedupon prior to exposure of specimens.7. Procedure Evaluation of Scribed Specimens7.1 Prepare Speci
18、mens for EvaluationPrepare the scribedspecimens in accordance with Test Method D 1654.7.2 QuantificationQuantify the corrosion or loss of paintextending from a scribe mark, that is, manual tracing followedby an imaging analysis.7.2.1 Creepage Area Tracing TechniqueTrace the rustcreepage area based o
19、n the procedure described in 7.2.1.1 and7.2.1.2.7.2.1.1 Marking Test SpecimenPlace the ruler immedi-ately below and parallel to the scribe line ab of the test panel(refer to Fig. 1 for geometry terms). Use the tracing pen tomark points g and h on the test panel so that gh is the centerline that repr
20、esents 80 % of the scribe line. Mark points i, j, k,and l with the pen on the borderline of creepage area such thatlines ig and kh are perpendicular to the scribe line (See Fig. 1).Remove the ruler.7.2.1.2 Area TracingPlace a single sheet of the transpar-ent plastic that is 50 % larger than the pane
21、l over the entirecorroded side of the scribed panel. Do not stretch the plasticsheet and ensure there are no folds or creases. Press the sheettightly against the panel and fold the excess around the back ofthe panel. To avoid any sliding, tape the plastic sheet to theback of the panel.(a) Orient the
22、 panel so that the scribe line is vertical anddirectly in front. With one hand, hold the panel and the plasticsheet, and with the other hand, trace the creepage or undercut-ting outline on the sheet using the pen. The tracing must bemade smoothly and continuously by holding the pen at about a75 angl
23、e to the surface with the upper end of pen away fromcreepage. Position the pen so that only the tip is in contact withthe surface and is at the point where the raised creepage areabegins. Halfway through the tracing, rotate the panel and theplastic 180 degrees and complete the tracing on the other s
24、ideof the scribe. Ensure that the plastic does not move during therotation. Make sure the traced lines at both ends of scribe lineare connected. The traced line must have uniform intensity andgood continuity.(b) On the plastic sheet, mark points i, j, k, and l on theoutside edge of the traced line.
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