1、 FORD LABORATORY TEST METHOD BJ 113-02 Date Action Revisions 2001 07 24 Revised Editorial no technical change A. Cockman 1990 06 18 Printed copies are uncontrolled Page 1 of 3 Copyright 2001, Ford Global Technologies, Inc. OXIDATION-CORROSION TEST FOR GREASES (Modified ASTM D 942 Oxidation Test) App
2、lication This procedure is used to determine the oxidation stability and corrosion effect of greases on brass, copper, beryllium copper and silver. Description of Test A sample of grease in five dishes is oxidized in a sealed container filled with oxygen at 758 kPa and 99 C. In the center three dish
3、es of the dish holder, any or all of the above material specimens are embedded in the grease. The degree of oxidation after a given period of time is determined by the corresponding decrease in oxygen pressure. The specimens are examined for corrosion. Apparatus Required Apparatus as Defined in ASTM
4、 D 942 Microscope Capable of 45x magnification. VWR Catalog No. 41433-111 or equivalent. Balance 160 g; precision +/- 0.001 g. VWR Catalog No. 11371-343 or equivalent. Source: VWR Scientific 3140 Grand River Detroit, Michigan Material Required Test Specimen Thin sheet stock or wire of such dimension
5、s to have a surface area of 76.00 +/- 13.00 mm2 Oxygen U.S.P. 99.5 +/- 0.1 % purity. CAUTION: Fire hazard - can support and accelerate combustion. FORD LABORATORY TEST METHOD BJ 113-02 Page 2 of 3 Copyright 2001, Ford Global Technologies, Inc. Steel Wool No. 0 Lintless Paper Naphtha CAUTION: Low fla
6、sh point. Pentane Refer to above caution for Naphtha. Sulfuric Acid Reagent grade 96 - 98 %. CAUTION: Corrosive. Solutions Required Sodium Dichromate Solution Reagent grade. Saturated solution. (Na2Cr2O7 2H2O) . CAUTION: Toxic, dangerous to eyes. Cleaning Solution Add 1 L of 96 - 98 % H2SO4 by slowl
7、y stirring into 35 mL of saturated sodium dichromate solution. 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 sa
8、me conditions unless otherwise specified. Procedure 1. Prepare oil bath and maintain at 99 +/- 2 C. 2. Clean five sample dishes thoroughly using the cleaning solution; avoid touching inside of the dishes during handling. 3. Clean the specimen strips or wires by rubbing with No. 0 fine steel wool, fo
9、llowed by rubbing with lintless paper and washing with naphtha and pentane. FORD LABORATORY TEST METHOD BJ 113-02 Page 3 of 3 Copyright 2001, Ford Global Technologies, Inc. 4. Fill each of the five dishes with 4.00 +/- 0.01 g of grease. 5. Embed three strips or wires of copper in one dish, three str
10、ips or wires of beryllium copper in another dish and three strips or wires each of brass and silver in a third dish. The two remaining dishes will not contain specimens. 6. Locate the five dishes on the dish holder so that the two dishes with no specimens are at the top and bottom level and the thre
11、e specimen dishes in the intermediate levels. 7. Place dish holder into the oxidation container and uniformly bolt on cover-pressure gage assembly. 8. Introduce oxygen into the container slowly until 690 kPa pressure is attained, then allow oxygen to escape slowly to displace (purge) the air in the
12、container; repeat four times. Recharge with 690 kPa of oxygen and allow to stand overnight to check for leakage (denoted by loss of pressure). 9. If 690 +/- 3 kPa pressure is maintained, place in previously prepared 99 C oil bath and observe pressure rise. Release oxygen intermittently until a const
13、ant pressure of 758 +/- 3 kPa is maintained for at least 2 h. A gradual drop in pressure indicates a continuous leak from the container; restart the test. 10. Test time starts when container is immersed in the oil bath. Record pressure drop at least each 24 h for duration of established test. 11. Al
14、low to cool to 23 +/- 2 C and bleed off all existing oxygen until gage indicates zero pressure. 12. Disassemble and carefully extract the dish holder. Remove dishes from top to bottom and arrange on table in the same order for evaluation. Inspection of Grease and Specimens 1. Observe any radical cha
15、nge in color of the tested grease in the five dishes. 2. Observe for any excessive softening of the tested grease. 3. Observe any staining or corrosion of any specimens. Examine microscopically (about 45 power). Rate the copper alloys per ASTM D 130. 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.
