Issue link: https://metalfinishing.epubxp.com/i/50181

exposure in real-world environments. The development of variations on basic accelerated corrosion tests have allowed engineers, technicians, and quality professionals to better evaluate durability of products to be used in a wider variety of environments, under multiple corrosive influences, and under constantly changing industrial conditions. The issue of consistency in test results has been addressed with the develop- ment of ASTM methods for evaluating consistency in a large or small number of test chambers to ensure repeatability and reproducibility. These standards are ASTM E 691 Practice for Conducting an Inter-laboratory Study to deter- mine the precision of a Test Method and the Mass Loss Corrosion Coupons such as described in ASTM B 117 Appendix X3. A variation of this Mass Loss Cor- rosion Coupon procedure is described in Paragraph 8.7 of ASTM B 368, using nickel coupons. ACCEPTABLE CRITERIA FOR CYCLIC TESTS The American Iron and Steel Institute in cooperation with the Automotive Cor- rosion and Prevention Committee of the SAE conducted a study of existing cyclic corrosion tests in order to develop tests that could be used to rank per- formance of materials used in au- tomotive applications. Approximately 20 existing tests were selected for study. These in- cluded static exposure condition tests, such as ASTM B117, and cyclic exposure condition tests such as ASTM G 85 Annex 5 and GM 9540P, which subject test pieces to a variety of different exposure at- mospheres and conditions over the duration of the test. Ten different test materials were exposed in each test. The results of the tests were compared to real-world exposure results from 10 sites around the globe utilizing duplicates of the same materials. It was concluded from results that an acceptable cor- rosion test must: (1) simulate the rank order of performance of coatings in ac- tual service; (2) produce the same type of failure as found in real-world experience (example:blistering); (3) be reproducible; (4) be of relatively short duration; and (5) be feasible and cost effective. The SAE J-2334, GM-9540P, and ASTM G 85-Annex 5 meet these criteria and are some of the more commonly used cyclic corrosion tests in the U.S. The SAE J-2334 and the GM-9540P were originally developed for testing cosmetic com- ponents on automobiles. Fortuitously, they have been shown also to be applic- able to a much wider variety of materials,finishes, and applications. For example, ASTM G 85, Annex 5, is particularly useful for testing both architectural coat- ings and industrial maintenance paints as well as other applications. Fig. 1. Schematic drawing of a typical salt fog test chamber. 294

- MFGB_COV1.pdf
- MFGB_COV2.pdf
- MFGB_1.pdf
- MFGB_2.pdf
- MFGB_3.pdf
- MFGB_4.pdf
- MFGB_5.pdf
- MFGB_6.pdf
- MFGB_7.pdf
- MFGB_8.pdf
- MFGB_9.pdf
- MFGB_10.pdf
- MFGB_11.pdf
- MFGB_12.pdf
- MFGB_13.pdf
- MFGB_14.pdf
- MFGB_15.pdf
- MFGB_16.pdf
- MFGB_17.pdf
- MFGB_18.pdf
- MFGB_19.pdf
- MFGB_20.pdf
- MFGB_21.pdf
- MFGB_22.pdf
- MFGB_23.pdf
- MFGB_24.pdf
- MFGB_25.pdf
- MFGB_26.pdf
- MFGB_27.pdf
- MFGB_28.pdf
- MFGB_29.pdf
- MFGB_30.pdf
- MFGB_31.pdf
- MFGB_32.pdf
- MFGB_33.pdf
- MFGB_34.pdf
- MFGB_35.pdf
- MFGB_36.pdf
- MFGB_37.pdf
- MFGB_38.pdf
- MFGB_39.pdf
- MFGB_40.pdf
- MFGB_41.pdf
- MFGB_42.pdf
- MFGB_43.pdf
- MFGB_44.pdf
- MFGB_45.pdf
- MFGB_46.pdf
- MFGB_47.pdf
- MFGB_48.pdf
- MFGB_49.pdf
- MFGB_50.pdf
- MFGB_51.pdf
- MFGB_52.pdf
- MFGB_53.pdf
- MFGB_54.pdf
- MFGB_55.pdf
- MFGB_56.pdf
- MFGB_57.pdf
- MFGB_58.pdf
- MFGB_59.pdf
- MFGB_60.pdf
- MFGB_61.pdf
- MFGB_62.pdf
- MFGB_63.pdf
- MFGB_64.pdf
- MFGB_65.pdf
- MFGB_66.pdf
- MFGB_67.pdf
- MFGB_68.pdf
- MFGB_69.pdf
- MFGB_70.pdf
- MFGB_71.pdf
- MFGB_72.pdf
- MFGB_73.pdf
- MFGB_74.pdf
- MFGB_75.pdf
- MFGB_76.pdf
- MFGB_77.pdf
- MFGB_78.pdf
- MFGB_79.pdf
- MFGB_80.pdf
- MFGB_81.pdf
- MFGB_82.pdf
- MFGB_83.pdf
- MFGB_84.pdf
- MFGB_85.pdf
- MFGB_86.pdf
- MFGB_87.pdf
- MFGB_88.pdf
- MFGB_89.pdf
- MFGB_90.pdf
- MFGB_91.pdf
- MFGB_92.pdf
- MFGB_93.pdf
- MFGB_94.pdf
- MFGB_95.pdf
- MFGB_96.pdf
- MFGB_97.pdf
- MFGB_98.pdf
- MFGB_99.pdf
- MFGB_100.pdf
- MFGB_101.pdf
- MFGB_102.pdf
- MFGB_103.pdf
- MFGB_104.pdf
- MFGB_105.pdf
- MFGB_106.pdf
- MFGB_107.pdf
- MFGB_108.pdf
- MFGB_109.pdf
- MFGB_110.pdf
- MFGB_111.pdf
- MFGB_112.pdf
- MFGB_113.pdf
- MFGB_114.pdf
- MFGB_115.pdf
- MFGB_116.pdf
- MFGB_117.pdf
- MFGB_118.pdf
- MFGB_119.pdf
- MFGB_120.pdf
- MFGB_121.pdf
- MFGB_122.pdf
- MFGB_123.pdf
- MFGB_124.pdf
- MFGB_125.pdf
- MFGB_126.pdf
- MFGB_127.pdf
- MFGB_128.pdf
- MFGB_129.pdf
- MFGB_130.pdf
- MFGB_131.pdf
- MFGB_132.pdf
- MFGB_133.pdf
- MFGB_134.pdf
- MFGB_135.pdf
- MFGB_136.pdf
- MFGB_137.pdf
- MFGB_138.pdf
- MFGB_139.pdf
- MFGB_140.pdf
- MFGB_141.pdf
- MFGB_142.pdf
- MFGB_143.pdf
- MFGB_144.pdf
- MFGB_145.pdf
- MFGB_146.pdf
- MFGB_147.pdf
- MFGB_148.pdf
- MFGB_149.pdf
- MFGB_150.pdf
- MFGB_151.pdf
- MFGB_152.pdf
- MFGB_153.pdf
- MFGB_154.pdf
- MFGB_155.pdf
- MFGB_156.pdf
- MFGB_157.pdf
- MFGB_158.pdf
- MFGB_159.pdf
- MFGB_160.pdf
- MFGB_161.pdf
- MFGB_162.pdf
- MFGB_163.pdf
- MFGB_164.pdf
- MFGB_165.pdf
- MFGB_166.pdf
- MFGB_167.pdf
- MFGB_168.pdf
- MFGB_169.pdf
- MFGB_170.pdf
- MFGB_171.pdf
- MFGB_172.pdf
- MFGB_173.pdf
- MFGB_174.pdf
- MFGB_175.pdf
- MFGB_176.pdf
- MFGB_177.pdf
- MFGB_178.pdf
- MFGB_179.pdf
- MFGB_180.pdf
- MFGB_181.pdf
- MFGB_182.pdf
- MFGB_183.pdf
- MFGB_184.pdf
- MFGB_185.pdf
- MFGB_186.pdf
- MFGB_187.pdf
- MFGB_188.pdf
- MFGB_189.pdf
- MFGB_190.pdf
- MFGB_191.pdf
- MFGB_192.pdf
- MFGB_193.pdf
- MFGB_194.pdf
- MFGB_195.pdf
- MFGB_196.pdf
- MFGB_197.pdf
- MFGB_198.pdf
- MFGB_199.pdf
- MFGB_200.pdf
- MFGB_201.pdf
- MFGB_202.pdf
- MFGB_203.pdf
- MFGB_204.pdf
- MFGB_205.pdf
- MFGB_206.pdf
- MFGB_207.pdf
- MFGB_208.pdf
- MFGB_209.pdf
- MFGB_210.pdf
- MFGB_211.pdf
- MFGB_212.pdf
- MFGB_213.pdf
- MFGB_214.pdf
- MFGB_215.pdf
- MFGB_216.pdf
- MFGB_217.pdf
- MFGB_218.pdf
- MFGB_219.pdf
- MFGB_220.pdf
- MFGB_221.pdf
- MFGB_222.pdf
- MFGB_223.pdf
- MFGB_224.pdf
- MFGB_225.pdf
- MFGB_226.pdf
- MFGB_227.pdf
- MFGB_228.pdf
- MFGB_229.pdf
- MFGB_230.pdf
- MFGB_231.pdf
- MFGB_232.pdf
- MFGB_233.pdf
- MFGB_234.pdf
- MFGB_235.pdf
- MFGB_236.pdf
- MFGB_237.pdf
- MFGB_238.pdf
- MFGB_239.pdf
- MFGB_240.pdf
- MFGB_241.pdf
- MFGB_242.pdf
- MFGB_243.pdf
- MFGB_244.pdf
- MFGB_245.pdf
- MFGB_246.pdf
- MFGB_247.pdf
- MFGB_248.pdf
- MFGB_249.pdf
- MFGB_250.pdf
- MFGB_251.pdf
- MFGB_252.pdf
- MFGB_253.pdf
- MFGB_254.pdf
- MFGB_255.pdf
- MFGB_256.pdf
- MFGB_257.pdf
- MFGB_258.pdf
- MFGB_259.pdf
- MFGB_260.pdf
- MFGB_261.pdf
- MFGB_262.pdf
- MFGB_263.pdf
- MFGB_264.pdf
- MFGB_265.pdf
- MFGB_266.pdf
- MFGB_267.pdf
- MFGB_268.pdf
- MFGB_269.pdf
- MFGB_270.pdf
- MFGB_271.pdf
- MFGB_272.pdf
- MFGB_273.pdf
- MFGB_274.pdf
- MFGB_275.pdf
- MFGB_276.pdf
- MFGB_277.pdf
- MFGB_278.pdf
- MFGB_279.pdf
- MFGB_280.pdf
- MFGB_281.pdf
- MFGB_282.pdf
- MFGB_283.pdf
- MFGB_284.pdf
- MFGB_285.pdf
- MFGB_286.pdf
- MFGB_287.pdf
- MFGB_288.pdf
- MFGB_289.pdf
- MFGB_290.pdf
- MFGB_291.pdf
- MFGB_292.pdf
- MFGB_293.pdf
- MFGB_294.pdf
- MFGB_295.pdf
- MFGB_296.pdf
- MFGB_297.pdf
- MFGB_298.pdf
- MFGB_299.pdf
- MFGB_300.pdf
- MFGB_301.pdf
- MFGB_302.pdf
- MFGB_303.pdf
- MFGB_304.pdf
- MFGB_305.pdf
- MFGB_306.pdf
- MFGB_307.pdf
- MFGB_308.pdf
- MFGB_309.pdf
- MFGB_310.pdf
- MFGB_311.pdf
- MFGB_312.pdf
- MFGB_313.pdf
- MFGB_314.pdf
- MFGB_315.pdf
- MFGB_316.pdf
- MFGB_317.pdf
- MFGB_318.pdf
- MFGB_319.pdf
- MFGB_320.pdf
- MFGB_321.pdf
- MFGB_322.pdf
- MFGB_323.pdf
- MFGB_324.pdf
- MFGB_325.pdf
- MFGB_326.pdf
- MFGB_327.pdf
- MFGB_328.pdf
- MFGB_COV3.pdf
- MFGB_COV4.pdf