Designation:D1654–05
Standard Test Method for
Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments1
This standard is issued under thefixed designation D1654;the number immediately following the designation indicates the year of original adoption or,in the ca of revision,the year of last revision.A number in parenthes indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.
This standard has been approved for u by agencies of the Department of Defen.
1.Scope
1.1This test method covers the treatment of previously painted or coated specimens for accelerated and atmospheric exposure tests and their subquent evaluation in respect to corrosion,blistering associated with corrosion,loss of adhesion at a scribe mark,or otherfilm failure.
1.2The values stated in SI units are to be regarded as the standard.The values given in parenthes are for information only.
1.3This standard does not purport to address all of the safety concerns,if any,associated with its u.It is the responsibility of whoever us this standard to consult and establish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to u.
2.Referenced Documents
2.1ASTM Standards:2
B117Practice for Operating Salt Spray(Fog)Apparatus D610Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces
D714Test Method for Evaluating Degree of Blistering of Paints
D822Practice for Filtered Open-Flame Carbon-Arc Expo-sures of Paint and Related Coatings3安全生产事故隐患排查治理暂行规定
D870Practice for Testing Water Resistance of Coatings Using Water Immersion
D1014Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
D1735Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
D2247Practice for Testing Water Resistance of Coatings in 100%Relative Humidity
D2803Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal
D4141Practice for Conducting Black Box and Solar Con-centrating Exposures of Coatings
D4585Practice for Testing Water Resistance of Coatings Using Controlled Condensation
D4587Practice for Fluorescent UV-Condensation Expo-sures of Paint and Related Coatings
D6695Practice for Xenon-Arc Exposures of Paint and Related Coatings3
E3Practice for Preparation of Metallographic Specimens G85Practice for Modified Salt Spray(Fog)Testing
G87Practice for Conducting Moist SO2Tests
2.2ANSI Standard:
B94.50Single-Point Cutting Tools,Basic Nomenclature and Definitions for4
3.Significance and U
3.1This method provides a means of evaluating and com-paring basic corrosion performance of the substrate,pretreat-ment,or coating system,or combination thereof,after exposure to corrosive environments.
4.Apparatus
物业工作
4.1Scribing Tools:
4.1.1Lathe Tool Type—High speed tool steel or tungsten carbide thread cutting lathe tool bit with a cutting tip having a 60°included angle.ANSI B94.50,Style E has been found to meet the requirements.(See Fig.1.)The tool bit is typically mounted in a holder such as a woodenfile handle to facilitate the scribing operation.
4.1.2Pencil Type—Pencil shaped device,with a high speed tool steel or tungsten carbide scribing tip.Typically the gripping surface is knurled.The tip may be replaceable or permanent.
4.1.3Other Types—Other types of scribing instruments which u a knife type blade such as a scalpel,razor blade,box cutter knife,or other sharp pointed tool are not acceptable unless agreed upon between the producer and the ur.
1This method is under the jurisdiction of ASTM Committee D01on Paint and Related Coatings,Materials,and Applications and is the direct responsibility of Subcommittee D01.25on Evaluation of Weathering Effects.
Current edition approved March1,2005.Published April2005.Originally approved in1959.Last previous edition approved in2000as D1654–92(2000).
2For referenced ASTM standards,visit the ASTM website,,or contact ASTM Customer Service at For Annual Book of ASTM Standards volume information,refer to the standard’s Document Summary page on
帮扶救助the ASTM website.
3Withdrawn.
4Available from American National Standards Institute,13th Floor,11W.42nd St.,New York,NY10036.
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Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.
4.2Straightedge —Any straightedge of sufficient length and rigidity to guide the scribing tool in a straight line.
4.3Air Source —A source of compresd air capable of delivering at least 4.72L/s (10ft 3/min)at 552kPa (80psi).4.4Air Gun —An air dusting gun and nozzle combination 5to meet the following specification:
Air Consumption,m 3/min (ft 3/min)Pressure,kPa
(psi)Nozzle Diameter,猴头菇
mm (in.)0.24(8.4)
550(80)
日本熊本3.0(0.12)
4.4.1A guard consisting of barriers,baffles,or screens is required to protect the operator and other individuals near the area where the air is being ud.The guard must be placed between the air nozzle and the operator.A device such as a sand-blasting cabinet has been found to be acceptable.
N OTE 1—The u of an air gun without a guard is in violation of the U.S.Occupational Safety and Health Administration regulation.
4.5Scraping Tool —A rigid spatula,knife,or similar instru-ment with no sharp edges or sharp corners.4.6Scale —Any rule with 1-mm divisions.
5.Preliminary Treatment of Test Specimens 5.1Scribed Specimens :
5.1.1Where specified or agreed upon,prepare each speci-men for testing by scribing it in such a manner that the scribe can be expod lengthwi when positioned in the test cabinet.This position will allow solution droplets to run lengthwi along the scribe.
5.1.2Scribe the specimen by holding the tool at approxi-mately a 70to 90°angle to the surface with the upper end of tool holder inclined toward the operator.Position the tool so that only the tip is in contact with the surface.(See Fig.2.)Pull the scribing tool to obtain a uniform V-cut through the coating that is being tested.Inspect the tool frequently,using low power magnification,for dulling,chipping or wear and replace or repair as needed.The scribe should be of sufficient length to cover the significant test area,but should not contact the edge of the specimen.The scribe must penetrate all organic coating layers on the metal,leaving a uniformly bright line.The extent of scribe penetration through metal coatings,such as galvanize,should be agreed upon between the producer and ur.The coil coating industry typically requires scribes to penetrate all organic coating layers but not penetrate the metal coating layers.The automotive industry typically requires scribes to penetrate all organic and metal coating layers.The pencil type may be less effective than the lathe tool type when scribing coating systems consisting of multiple layers of organic coat-ings or coating systems including metal layers.When scribing coating systems consisting of multiple layers of organic coat-ings or coating systems including metal layers the depth and quality of scribe technique should be evaluated using the cross ction,castable plastic mount,polishing technique described in Practice E 3.Quality of the scribe technique may also be obrved with the aid of low-power magnification.Note,mark,and describe defects,coding,and flaws that may affect results.5.1.3One cut
may not be sufficient to cut multi-layer protective coatings down to the metal.The u of more than one cut must be agreed to between all concerned parties prior to scribing,and the number of cuts must be recorded in the test documentation.When multiple cuts are needed,each cut must be done in the same direction.
5.1.4Scribe lines other than tho of a single,straight nature may be ud if agreed upon between the producer and the ur.5.1.5Expo scribed specimens in accordance with
6.1and rate in accordance with Section
7.
5.2Unscribed Specimens —Specimens coated with paint undercoats,oils,or waxes may be evaluated without a scribe.Expo such specimens in accordance with Section 6and rate for corrosion of the general surface in accordance with Section 8.
5.3Cut Edges —Cut edges of panels may be expod during testing,or protected by wax,tape,or other means as agreed upon between the producer and the ur.If left unprotected,method of shearing panel edges should be agreed upon between the producer and ur,noting whether edges are oriented in the “burr up”or “burr down”configuration.
5.4Deformation —Deformation of test panels prior to ex-posure,if desired,should be agreed upon between the producer and ur.
6.Exposure of Test Specimens
6.1Expo test specimens in accordance with one or more of the following test methods or practices:B 117,D 610,D 714,D 822,D 870,D 1014,D 1735,D 2247,D 2803,D 4141,D 4585,D 4587,D 6695,G 85,G 87,or any other applicable test method,as agreed upon between the producer
5
Spray gun and nozzles,Model No.AA23LTP0020have been found satisfactory and may be obtained from Spray Systems Co.,North Avenue at Schmale Road,Wheaton,IL 60187.Equivalents may be
ud.
FIG.1Scribe
Tool
FIG.2Scribing Tool in
Action
2
and the ur.The length of test and evaluation intervals should be agreed upon prior to exposure of specimens.
7.Procedure A—Evaluation of Scribed Specimens
7.1Method1(Air Blow-Off)—Rin each specimen after completion of the exposure period,using a gentle stream of water at a temperature up to45°C(110°F).Holding the nozzle at approximately a45°angle,blow along the entire scribe line, disturbing the surface adjacent to the scribe mechanically by the air nozzle to ensure an opening for the air blast.Complete the air blasting within15min of specimen removal from the exposure cabinet.If the air blasting cannot be completed within
the prescribed time,immer the specimens in water at room temperature or store in a plastic bag to avoid any drying effect.
7.2Method2(Scraping)—Rin the specimen after completion of the exposure period,using a gentle stream of water at a temperature up to45°C(110°F).Scrape the specimen vigorously with an instrument described in4.5while under the gentle stream of the rin water.Hold the scraper with its face perpendicular to the specimen surface and parallel to the scribe,moving it back and forth across the scribe to remove the coating that has been undercut and has suffered loss of adhesion only,not to remove the coating that still has adhesion.Complete the scraping within15min of specimen removal from the exposure cabinet.If scraping cannot be completed within the prescribed time,immer the specimens in water at room temperature or store in a plastic bag to avoid any drying effect.
N OTE2—Rinsing,scraping,or air blow off may not be appropriate in all cas,such as for interim ratings in continuing tests.Alternative methods may be ud if agreed upon between the producer and the ur.
7.3Rating—Rate the corrosion or loss of paint extending from a scribe mark as prescribed in Table1.cosme大赏
Record the reprentative mean,maximum,and minimum creepage from the scribe,and note whether or not the maximum is an isolated spot.Record creep values in millimeters,inches,or rating numbers,as agreed upon between producer and ur.
7.3.1Unless otherwi agreed upon by the producer and ur,scribe creepage is defined as“one sided,”that is,from the original scribe line to the creepage front.Also,rate in accor-dance with Table2the prevalence of corrosion on areas removed from the scribe.8.Procedure B—Evaluation of Unscribed Areas
8.1Rin the specimen after completion of the exposure period(Section6),using a gentle stream of water at a temperature up to40°C(100°F).Dry the surface of the specimen with paper towels or compresd air.Drying should be done in such a manner that the corrosion on the specimen surface is not disturbed.
8.2Evaluate unscribed specimens for corrosion spots,blis-ters,and any other types of failure that may occur.Where the character of the failure permits,the photographic blister standards given in Test Method D714may be ud to describe the results of the exposure test,with respect to size of blisters or corroded areas,while Test Method D610may rve to describe the frequency and distribution of rusting.Record the size,frequency,or area affected.Discount corrosion within 12.7mm(1⁄2in.)of edges.
8.3Rating—Record percent failed area or convert percent failure to rating numbers in accordance with Table2as agreed upon between the producer and ur.
N OTE3—Formation of under-film corrosion may be evaluated and reported in accordance with Table2if thefilm isfirst carefully stripped with a neutral stripper.Exerci care to avoid alteration of the corrosion pattern or pretreatment.
N OTE4—Where the character of the failure permits,the photographic blister standards given in Test Method D714may be ud to describe the results of the exposure test,in respect to size of blisters or corroded areas, while Test Method D610may rve to describe the frequency and distribution,if desired.
9.Procedure C—Evaluation of Unprotected Edges
9.1If paint creepage from cut edges is tested,rate the corrosion or loss of paint extending from a cut edge in the same manner described for scribes in Procedure A.
10.Procedure D—Evaluation of Formed Areas
10.1If tested samples contain bends,dimples,or other formed areas of interest,rate the extent of failur
e at the areas parately in the same manner described in Procedure B,or as agreed upon between the producer and ur.
11.Report
11.1The report shall include the following information, unless otherwi agreed upon between the producer and ur: 11.1.1All pertinent information regarding the conduct of each corrosion test,as prescribed in the specifications for each test,
TABLE1Rating of Failure at Scribe(Procedure A) Reprentative Mean Creepage From Scribe
Millimetres
Inches
(Approximate)
Rating
隐形床Number
Zero010 Over0to0.50to1⁄649 Over0.5to1.01⁄64to1⁄328 Over1.0to2.01⁄32to1⁄167 Over2.0to3.01⁄16to1⁄86 Over3.0to5.01⁄8to3⁄165 Over5.0to7.03⁄16to1⁄44 Over7.0to10.01⁄4to3⁄83 Over10.0to13.03⁄8to1⁄22 Over13.0to16.01⁄2to5⁄81 Over16.0to more5⁄8to more0TABLE2Rating of Unscribed Areas(Procedure B) Area Failed,%Rating Number No failure10
0to19
2to38
4to67
7to106
11to205恶的反义词
21to304
31to403
41to552
56to751
Over75
0 3
11.1.2Methods of scribing,shearing,or forming,or com-bination thereof,or test specimens.
11.1.3Ratings of test specimens,including procedure(s) employed.
12.Precision and Bias
12.1Precision—Since this is a method of evaluation bad on measurements after various tests,the statement of precision applicable to each specific method of exposure to corrosive environments applies.
13.Keywords
13.1blistering;corrosion;creepage;edge/scribe;paints/ related coatings/materials;rust
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