ASTM D6944-2009 923 Standard Practice for Resistance of Cured Coatings to Thermal Cycling《硫化涂层耐热循环的标准实施规程》.pdf
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1、Designation: D 6944 09Standard Practice forResistance of Cured Coatings to Thermal Cycling1This standard is issued under the fixed designation D 6944; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice determines the resistance of cured coatingsto repeated thermal cycles. This procedure is designed to assessthe influence of
3、thermal cycling on adhesion and other prop-erties of coatings. This procedure is not intended to provide aquantitative measure of the service life that can be expectedfrom a specific coating system on a given substrate.1.2 This standard does not purport to address all of thesafety concerns, if any,
4、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:2D 660 Test Method for Evaluating Degree of Checking o
5、fExterior PaintsD 661 Test Method for Evaluating Degree of Cracking ofExterior PaintsD 714 Test Method for Evaluating Degree of Blistering ofPaintsD 3359 Test Methods for Measuring Adhesion by Tape TestD 4541 Test Method for Pull-Off Strength of CoatingsUsing Portable Adhesion TestersD 6677 Test Met
6、hod for Evaluating Adhesion by KnifeG 147 Practice for Conditioning and Handling of Nonme-tallic Materials for Natural and Artificial Weathering Tests3. Summary of Test Methods3.1 Test Method ACured test specimens are subjected to30 thermal cycles of immersion, freezing and heating.3.2 Test Method B
7、Cured test specimens are subjected to30 thermal cycles of freezing and heating.4. Significance and Use4.1 The purpose of this test is to obtain information on theability of a coating system to adhere to substrates underthermal stress. It is assumed that the coating systems used areapplied and cured
8、according to the given specifications of thecoating manufacturer.TEST METHOD AFREEZE/THAW/IMMERSION5. Apparatus5.1 Thermal Cycling Apparatus:5.1.1 The thermal cycling apparatus shall consist of asuitable chamber or chambers in which the test specimens mayundergo the specified cycle. Ideally, a chamb
9、er which containsheating and refrigeration equipment and immersion capabilitiesin the same unit should be used. This chamber shall have theability to maintain continuous reproducible cycles within thespecified temperature requirements. In the event that an appa-ratus having freezing, heating, and im
10、mersion capabilities isnot available, separate equipment for freezing, heating andimmersion may be used.5.1.2 The chamber or chambers shall have the ability tomaintain a constant temperature during each of the respectivetemperature intervals as specified by the procedure.5.1.3 The samples shall be a
11、rranged to minimize contactwith the chamber surfaces or any mounting racks, and tomaximize air flow.5.1.4 The temperature of the thermal cycling apparatus shallgive uniform readings at various locations within the chamber,within 3C (5F) at any given time, except during the transitionbetween heating
12、and freezing cycles. A two hour temperatureramping period is permitted for the equipment to reach the nexttemperature setting.6. Test Specimens6.1 Apply each coating onto the substrate as agreed upon.Minimum film thicknesses should take substrate profile intoaccount when applied.1This practice is un
13、der the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved July 1, 2009. Published July 2009. Originally approvedin 2003. Last previous edition
14、approved in 2003 as D 6944 - 03.2For 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 website.1Copyright ASTM International
15、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Apply each coating or coating system to a minimum oftwo specimens to determine repeatability. If the substrate ofchoice is concrete, then suitable encapsulation of the substratemust occur as agreed upon between
16、 purchaser and supplier.6.2.1 When destructive tests are run, it is recommended thata sufficient number of reference specimens be retained so thatthe property of interest can be determined on unexposedreference specimens each time exposed materials are evalu-ated.6.2.2 Exposure of a similar material
17、 of known performance(a control) at the same time as the test materials is stronglyrecommended.6.3 Follow the procedures described in Practice G 147 foridentification, conditioning and handling of specimens of test,control, and reference materials prior to, during, and afterexposure.6.4 Unless other
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