1、SAE Technical Standards Board Rules provide that: This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom
2、, is the sole responsibility of the user.SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2002 Society of Automotive Engineers, Inc.All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: custsvcsae.orgSAE WEB ADDRESS: http:/www.sae.orgSURFACEVEHICLESTANDARDJ2334REV.DEC2003Issued 1998-06Revised 2003-12Superseding J2334 OCT2002Laboratory Cyclic Corrosion TestForewordThis laboratory cyclic corrosion test procedure is based on a field-correlated Design o
5、f Experimentprocess conducted by the SAE Automotive Corrosion and Prevention Committee (SAE/ACAP) and the Auto/SteelPartnership (A/SP) Corrosion Task Force. Results from this test will provide excellent correlation to severecorrosive field environments with respect to cosmetic corrosion performance.
6、 For historical information on thedevelopment of this test, refer to 2.1.4.A typical automotive paint system was used to develop this test. See 2.1.4, 1 to 5. If a different type of coatingsystem is used, field correlation must be determined.1. ScopeThe SAE J2334 lab test procedure should be used wh
7、en determining corrosion performance for aparticular coating system, substrate, process, or design. Since it is a field-correlated test, it can be used as avalidation tool as well as a development tool. If corrosion mechanisms other than cosmetic or generalcorrosion are to be examined using this tes
8、t, field correlation must be established.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest version of SAE publications shall apply.2.1.1 SAE PUBLICATIONAvailable from SAE, 400 Com
9、monwealth Drive, Warrendale, PA 15096-0001.SAE J1563Guidelines for Laboratory Cyclic Corrosion Test Procedures for Painted Automotive Parts2.1.2 ASTM PublicationsAvailable from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM D 1193Specification for Reagent WaterASTM D 1654Method f
10、or Evaluation of Painted or Coated Specimens Subjected to CorrosiveEnvironmentsASTM D 1735Practice for Testing Water Resistance of Coatings Using Water Fog ApparatusASTM D 2247Practice for Testing Water Resistance of Coatings in 100% Relative HumidityASTM E 70-90Test Method for pH of Aqueous Solutio
11、ns with the Glass ElectrodeASTM G 1Recommended Practice for Preparing, Cleaning, and Evaluating Corrosion Test SpecimensCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2334 Revised DEC2003-2-2.1
12、.3 GENERAL MOTORS PUBLICATIONSAvailable from Global Engineering Documents, 15 Inverness Way East,Englewood, CO 80112.GM 9540P Accelerated Corrosion Test2.1.4 OTHER PUBLICATIONS1. Townsend, H. E., “Development of an Improved Laboratory Corrosion Test by the Automotive and SteelIndustries,” in Advance
13、d Coatings Technology, Proceedings of the fourth Annual ESD AdvancedCoatings Conference, The Engineering Society, Ann Arbor, MI, 1994, pp. 29-49.2. Roudabush, L.A., Townsend, H.E., and McCune, D.C., “Update on the Development of an ImprovedCosmetic Corrosion Test by the Automotive and Steel Industri
14、es,” Automotive Corrosion andPrevention Conference Proceedings, P-268, Society of Automotive Engineers, Warrendale, PA, 1993,pp. 53-63.3. Townsend, H.E., “Accelerated Corrosion Testing: A Cooperative Effort by the Automotive and SteelIndustries, “ Proceedings of the Symposium on Corrosion-Resistant
15、Automotive Sheet Steels, ASMMaterials Congress, ASM International, Metals Park, OH, 1988, pp. 55-67.4. Townsend, H.E., “Status of a Cooperative Effort by the Automotive and Steel Industries to Develop aStandard Accelerated Corrosion Test,” Automotive Corrosion and Prevention Conference Proceedings,P
16、-228, Society of Automotive Engineers, Warrendale, PA, 1989, pp. 133-145.5. Townsend, H.E., Granata, R.D., McCune, D.C., Schumacher, W.A., and Neville, R.J., “Progress by theAutomotive and Steel Industries Toward an Improved Laboratory Cosmetic Corrosion Test,”Automotive Corrosion and Prevention Con
17、ference Proceedings, P-250, Society of AutomotiveEngineers, Warrendale, PA, 1991, pp. 73-97.6. Stephens, M.L., “SAE ACAP Division 3 Project: Evaluation of Corrosion Test Methods,” AutomotiveCorrosion and Prevention Conference Proceedings, P-228, Society of Automotive Engineers,Warrendale, PA, 1989,
18、pp. 157-164.7. Lutze, F.W., and Shaffer, R.J., “Accelerated Atmospheric Corrosion Testing of AISI Panels,” AutomotiveCorrosion and Prevention Conference Proceedings, P-250, Society of Automotive Engineers,Warrendale, PA, 1991, pp. 115-127.8. Petschel, M., “Statistical Evaluation of Accelerated Corro
19、sion Tests and Correlation with Two-Year On-Vehicle Tests,” Automotive Corrosion and Prevention Conference Proceedings, P-250, Society ofAutomotive Engineers, Warrendale, PA, 1991, pp. 179-203.9. Davidson, D.D. and Schumacher, W.A., “An Evaluation and Analysis of Commonly Used AcceleratedCosmetic Co
20、rrosion Tests Using Direct Comparison with Actual Field Exposure,” Automotive Corrosionand Prevention Conference Proceedings, P-250, Society of Automotive Engineers, Warrendale, PA,1991, pp. 205-219.10. Ostermiller, M.R., and Townsend, H.E., “On-Vehicle Cosmetic Corrosion Testing of Coated and Cold-
21、Rolled Steel Sheet,” Automotive Corrosion and Prevention Conference Proceedings, P-268, Society ofAutomotive Engineers, Warrendale, PA, 1993, pp. 65-83.11. Granata, R.D. and Moussavi-Madani, M., “Characterization of Corrosion Products and CorrosionMechanisms on Automotive Coated Steels Subjected to
22、Field and Laboratory Exposure Tests,” LeighUniversity Report to the ASP Corrosion Task Force, January 10, 1996.12. ASTM E 691-92, “Standard Practice for Conducting an Interlaboratory Study to Determine thePrecision of a Test Method.” 13. ASTM E 177-90a, “Standard Practice for Use of the Terms Precis
23、ion and Bias in ASTM Test Methods.” 14. Townsend, H.E. and McCune D.C., “Round-Robin Evaluation of a New Standard Laboratory Test forCosmetic Corrosion,” Automotive Corrosion and Prevention Conference Proceedings, SP-1265,Society of Automotive Engineers, Warrendale ,PA, 1997, pp. 53-68.15. H. E. Tow
24、nsend, D. D. Davidson, and M. R. Ostermiller, “Development of Laboratory Corrosion Testsby the Automotive and Steel Industries of North America,” Proceedings of the Fourth InternationalConference on Zinc and Zinc-Alloy Coated Steel Sheet, Iron and Steel Institute of Japan, Tokyo, pp.659-666 (1998).C
25、opyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2334 Revised DEC2003-3-16. F. W. Lutze, D. C. McCune, and K. A. Smith, “Development of and Interlaboratory Test Evaluation of aLaboratory Corrosion
26、 Tests by the Automotive and Steel Industries of North America,” 24th AnnualConference of Future Of Coatings Under Study (FOCUS), Detroit Society for Coatings Technology,Troy Michigan, U.S.A., (4-1999).17. F. W. Lutze, D. C. McCune, H. E. Townsend, K. A. Smith, R. J. Shaffer, L. S. Thompson, and H.
27、D.Hilton, “The Effects of Temperature and Salt Concentration on the Speed of the SAE J2334 CyclicCorrosion Test,” Proceedings of the European Corrosion Congress, London (2000).18. F. W. Lutze, D. C. McCune, J. R. Schaffer, K. A. Smith, L.S. Thompson, and H. E. Townsend,“Interlaboratory Testing to Ev
28、aluate improvements in the precision of the SAE J2334 Cyclic CorrosionTest,” Proceedings of the Fifth International Conference on Zinc and Zinc Alloy Coated Steel Sheet,Centre for Research in Metallurgy, Brussels Belgium (June 2001).19. SAE ACAP committee, presented by Cynthia L. Meade, “Update on t
29、he developments of the SAEJ2334 laboratory Cyclic Corrosion Test”, SAE International Congress 2003, SAE International, Detroit,MI, paper # 2003-01-1234.20. SAE ACAP committee, presented by Larry S. Thompson, “Perforation Corrosion Performance ofAutobody Steel Sheet in On-Vehicle and Accelerated Test
30、s”, SAE International Congress 2003, SAEInternational, Detroit, MI, paper # 2003-01-1238.21. SAE SP-1770 - Advances in Coatings & Corrosion Prevention.2.1.4.1 Reproducibility and Repeatability information concerning this test method is discussed in SAE Paper970734. See Reference 14.3. Definitions3.1
31、 Cosmetic CorrosionCorrosion that occurs as a result of the breakdown or damage to a coating system.Typically, this type of corrosion does not impact function but does compromise appearance.3.2 General CorrosionCorrosion of a component that is typically bare (no organic coating). Corrosive attack is
32、uniform in nature and distributed over “large” areas.3.3 Scribe CreepbackCoating creepback resulting from corrosion and undercutting from the scribe line. Ascribe is a controlled simulated damage site designed to represent a scratch or chip.3.4 Corrosion CouponsSamples of bare metals, that are used
33、to monitor and compare the corrosivity oflaboratory corrosion tests in terms of mass-loss.3.5 Test ControlsComponents (i.e., test panels, coupons, parts, etc.) which have been previously tested and/orcorrelated. They can be used to control the test conduct and compare the test results (also assist i
34、n evaluatingreproducibility and repeatability).4. Equipment and Test Materials4.1 Test CabinetsTest cabinet(s) with the ability to obtain and maintain the following environmental conditions(Reference SAE J1563, ASTM D 1735, and ASTM D 2247):a. 50 C 2 C and 100% Relative HumidityThe 100% relative hum
35、idity wet-stage condition can beachieved by use of one of the three methods shown as follows. Whichever method is employed, testsamples and controls are required to be visibly moist/wet. 1. Wet-bottom method according to ASTM D 2247 except that the temperature shall be 50 C 2 C. 2. Water fog method
36、according to ASTM D 1735, except that the collection rate is reduced from a rangeof 1.5 to 3 mL/h to 0.75 to 1.5 mL/h. The use of this method requires that the collection rates bedocumented. 3. Steam (vapor) generator method. Copyright SAE International Provided by IHS under license with SAENot for
37、ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2334 Revised DEC2003-4-NOTE The majority of the development of this specification was performed using the Wet-bottom method ofhumidity generation. This method was used as the basis when comparing other methods ofhumidity
38、 generation as well as other variables. b. 60 C 2 C and 50% Relative Humidity 5%. Additional equipment will be required to maintain the50% relative humidity condition.Air circulation must be sufficient to prevent temperature stratification and allow drying of test parts during thedry-off portion of
39、the test cycle.Air circulation can be obtained through the use of a fan or forced air.4.2 Salt Solution ApplicationThe samples must be subject to an application of salt solution by use of one ofthe three methods shown as follows. Whichever method is employed, test samples and controls are requiredto
40、 be visibly moist/wet during the entire 15-minute interval of each test cycle.0.5% NaCl0.1% CaCl20.075% NaHCO3a. Immersion MethodTest specimens are to be immersed in the salt solution for a 15-minute interval ofeach test cycle.b. Spray MethodA periodic or continuous direct impingement spray of the s
41、alt solution over the15-minute interval that ensures the test specimens are kept wet for the entire 15-minute interval. Avoida high intensity (pressure) spray that may affect test results. (Note 5) Both direct solutiondisplacement and atomized spray are suitable for this method.c. Air Atomized Fog M
42、ethodApplications of the salt solution to the test specimens by a 15-minuteexposure to atomized fog provided the fog collection rate is 2 to 4 mL/h instead of 1 to 2 mL/h(collection rate as defined in ASTM D 1735). The use of this method requires that the collection ratesbe documented.NOTE 1“Either
43、the CaCl2or NaHCO3material must be dissolved separately in deionized water (ReferenceASTM D 1193 Type IV) and then added to the solution of other materials. If all solid materials areadded at the same time in a “dry” state, an insoluble precipitate may result. If a precipitate forms anda spray appli
44、cation is used to apply the solution, it may be necessary to remove the precipitate toavoid clogging of nozzles (i.e., filter or siphon solution). Any filter media used must be inert to thesolution being used. A 20 to 100 micron cotton or nylon mesh filter would be suitable. Do notattempt to dissolv
45、e the precipitate by adding acid.NOTE 2Measure and record pH of the salt solution prior to the start of test and on a weekly basis thereafter(Reference ASTM E 70-90). Do not attempt to adjust the pH with any form of buffers.NOTE 3The majority of the development of this specification was performed us
46、ing the immersion method ofsalt solution application. This method was used as the basis when comparing other methods of saltsolution applications as well as other variables.NOTE 4A freshly prepared test solution will have a conductivity of 10 to 12 ms at 25 C 2 C. Measure andrecord the conductivity
47、(in units of ms) of the salt solution after mixing, prior to the last amount beingused, and as needed to ensure that the conductivity of the solution remains between 10 to 12 mS at25 C.NOTE 5Careful attention should be paid to the spray method to avoid a high intensity spray that may affecttest resu
48、lts by removal of the corrosion product, removal of the coating or driving solution into thecorrosion products.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2334 Revised DEC2003-5-It is recomm
49、ended that the test solution be changed weekly and that agitation/stirring of the solution be doneprior to the salt solution application.5. Test Procedure5.1 Test CycleThe test cycle is outlined in Figure 1 (5 day/week manual operation) and Figure 2 (7 day/week -automatic operation). It consists of three basic stages: 1. Humid Stage50 C and 100% humidity, 6 h in duration,2. Salt Application Stage15 min duration conducted at ambient conditions3. Dry
