1、 FORD LABORATORY TEST METHOD BJ 005-01 Date Action Revisions 2001 07 23 Revised Editorial no technical change A. Cockman 1993 01 07 Printed copies are uncontrolled Page 1 of 3 Copyright 2001, Ford Global Technologies, Inc. FALEX PIN CORROSION TEST Application This procedure is used to determine the
2、probability of rusting of gear housing assemblies where a lubricant containing potentially corrosive chemicals is used and where moisture is present. The method also indicates the effectiveness of inhibitors which may have been added to the lubricant to prevent rust formation. Apparatus Required Fal
3、ex E.P. Tester A Falex or other similar machine where loading may be controlled to produce an oil bath temperature of 100 +/- 2 C is required. Falex Pin and Bushings The pin and bushings referred to in this procedure are the same as the standard steel test shaft and bushings used in Ford Laboratory
4、Test Method BJ 1-1. Forceps A clean pair of forceps is required for handling the pin and bushings as at no time during the test should they be touched with the hands, which may leave a moisture film on the part and cause rusting. Oven A drying oven at 80 +/- 2 C is required. Draining the lubricant f
5、rom the pins at this temperature simulates axle drainage conditions from that part of a differential ring gear above the oil after a test. Bell Jar A Bell jar (150 - 175 mm I.D. and 225 - 250 mm high) placed over a 300 by 300 mm glass plate is necessary to expose the sample pins at a relative humidi
6、ty of 60 - 90 %. The ground edge of the Bell jar should be coated with stopcock grease to effect a tight seal when placed on the glass plate. Thermometer If the oil bath of the Falex machine is not equipped with a thermocouple-thermometer, a glass thermometer (0 - 150 C) must be placed in the test c
7、up near the bushings and pin so that the bulb end is completely immersed in the oil. FORD LABORATORY TEST METHOD BJ 005-01 Page 2 of 3 Copyright 2001, Ford Global Technologies, Inc. Gooch Crucible A porcelain Gooch crucible is required for draining excess oil from the pin. Reagents Required Naphtha
8、Petroleum Ether Butyl Cellosolve Phosphoric Acid - 20 % by volume Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the
9、 same conditions unless otherwise specified. Procedure 1. Clean standard pin and bushings by brushing in naphtha to remove all traces of rustproofing grease and oil and air dry. 2. Examine and select pins and bushings which have no flaws or surface roughness. 3. Clean pin and bushings (use forceps)
10、in petroleum ether and dry with a clean, soft towel. 4. Pour oil into E.P. test cup and heat to 90 +/- 2 C. 5. Assemble the pin and bushings in the machine with forceps. 6. Load the machine sufficiently to maintain an oil bath temperature of 100 +/- 2 C and run the test for 25 minutes. Note: 1. Heat
11、 generated by friction between pin and bushings causes a release of the chemical additives such as occur in the frictional contact of gears in service. 2. If seizure of the pin or excessive scoring occurs, the test shall be run at a lower load. If necessary, a source of external heat should be appli
12、ed to maintain the oil bath temperature. FORD LABORATORY TEST METHOD BJ 005-01 Page 3 of 3 Copyright 2001, Ford Global Technologies, Inc. 7. With a clean forceps, remove the pin from the machine, place on end at a slight angle in the Gooch crucible, place the crucible on a watch glass and heat in an
13、 oven at 80 +/- 2 C for 30 minutes. 8. Place the crucible containing the pin on a 300 x 300 mm glass plate in an area free of corrosive fumes. 9. Place a 150 mL beaker of tap water on center of plate, cover with a Bell jar for 24 h at 23 +/- 2 C. Make sure that an air tight seal is formed between Be
14、ll jar and plate, and that no water is splashed onto pin. 10. Remove pin with forceps, wash in petroleum ether to remove traces of lubricant. 11. Wash in butyl cellosolve to remove oxidized oil deposits. Severe deposits of oxided oil may be removed by long soaking in butyl cellosolve followed by a g
15、entle rubbing with a soft cloth moistened in butyl cellosolve. 12. Inspect visually for iron oxide rust deposits. Brownish deposits may be due to varnish or oxidized residue. A spot test may be made by using a drop or two of 20 % phosphoric acid on a part of the brown deposit. Iron rust will be diss
16、olved by this treatment. 13. If specimens are required for future reference, coat with clear lacquer or mount in Lucite or other clear plastic. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
