SAE J1684-2000 pdf download Test Method for Evaluating the Electrochemical Resistance of Coolant System Hoses and Materials
1. Scope—This test method provides a standardized procedure for evaluating the electrochemical resistance of automotive coolant hose and materials. Electrochemical degradation has been determined to be a major cause of EPDM coolant system hose failures. The test method consists of a procedure which induces voltage to a test specimen while it is exposed to a water/coolant solution. Method #1 , referred to as a “Brabolyzer” test, is a whole hose test. Method #2, referred to as a “U” tube test, uses cured plate samples or plates prepared from tube material removed from hose (Method No. 2 is intended as a screening test only). Any test parameters other than those specified in this SAE Recommended Practice, are to be agreed to by the tester and the requester.
2. References
2.1 Related Publications—The following publications are provided for information purposes only and are not a required part of this document.
R. C. Keller, SAE Technical Paper 900576, February 28, 1 990
Harold Schneider, Hal Tucker, Dr. Eddie T. Seo, Rubber Division, ACS Technical Paper 73, May 22, 1 992 3. Method #1 “Brabolyzer,” Whole Hose Test—Materials and Equipment Required
3.1 1 2 V DC power supply.
3.2 Multivolt ohmmeter.
3.3 Commercial automotive coolant, ethylene glycol based containing an inorganic anticorrosion protection system, shall be used These coolants are typically green in appearance.
3.4 End plugs chemically resistant, electrically nonconductive thermoplastic as polyamide, PTFE, or polypropylene suitable for isolating voltage applied to end of hose from the liquid test media inside the hose. Electrical contact surface for applied voltage should be the inside circumference of test hose. See Figures 1 A and 1 B for end plug assembly components. The end plugs shown are for 31 .8 mm ID hose, which is preferred, but other sizes can also be made.
3.5 Glass insulator to isolate electrically the hose samples attached to the negative and positive terminals. See Figure 2.
3.6 Suitable hose clamps for size of hose used.
3.7 Air-circulating oven configured with wooden or other nonconducting surface for complete electrical isolation of test assembly.
3.8 Suitable electrical leads and clips for connecting power source to end plug.
3.9 Microscope (1 0X to 20X) for examination of specimens after test. A stereo microscope is best, using a fiberoptic light source that can be adjusted for angle.
3.10 Two 1 00 mm straight samples for each cell. Curved hose may be used if straight hose is not available.
4. Set-Up Procedure
4.1 Attach one end-plug flush to one end of test hose with appropriate clamp.
4.2 Attach glass insert between the two test hoses with appropriate clamps.
4.3 Fill hose assembly 80% ± 5% by volume with a solution of 50:50 distilled water/coolant.
4.4 Attach second end plug to test specimen with appropriate clamp.
4.5 Mark specimen with pertinent identification and positive or negative polarity. Marking should be on the top side of the hose as it lays in the oven for use as a reference point.
4.6 Make three of the previous completed assemblies per test. See Figure 3.
5. Test Procedure
SAE J1684-2000 pdf download
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