1、 FORD LABORATORY TEST METHOD BJ 107-03 Date Action Revisions 2001 07 24 Revised Editorial no technical change A. Cockman 1990 05 14 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. HUMIDITY TEST FOR RUST PREVENTIVE COMPOUNDS Application This procedure is use
2、d to test the corrosion protection given to steel panels when treated with a rust preventive compound and subjected to conditions of high humidity and an elevated temperature. This test is generally used for coolants, mild rust inhibitors and cleaners which have rust preventive properties. Apparatus
3、 Required Humidity Cabinet The humidity cabinet required for this test shall be capable of maintaining an atmosphere in the test chamber of 95 - 100 % relative humidity and a temperature of 38 +/- 1 C. Refer to FLTM BQ 104-02. Evaluation Grid A transparent grid* of pliable plastic, marked off in 6.4
4、 mm squares, is used to determine the amount of corrosion on the test specimens. The standard grid shall be rectangular in shape and shall contain 100 6.4 mm squares (the lines marking the squares shall not exceed 0.13 mm in width). The percent of corrosion is determined by placing the grid in firm
5、contact with the surface of the test specimen and counting the grid units containing corrosion concerns. * A convenient grid size for overall evaluation is 64 x 64 mm. Illumination for Evaluating Test Results Fluorescent daylight white. 645-860 lux at area where examination of part is being performe
6、d. Glass Hooks Suitable for hanging the panels. Materials Required Steel Panels Refer to FLTM BJ 106-01. FORD LABORATORY TEST METHOD BJ 107-03 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. Conditioning and Test Conditions All test values indicated herein are based on material conditione
7、d 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 same conditions unless otherwise specified. Procedure 1. Prepare five steel test panels by solvent cleaning as described in FLTM BJ 106-01. 2. Immerse two panels i
8、nto an approved sample of the rust preventive compound as a control and two panels into the sample submitted for test. . Immersion time shall be 15 - 20 s to obtain complete wetting of the panel. . One panel is left untreated but carried through the exposure period for comparison with the treated pa
9、nels. 3. Hang the panels from glass hooks for 4 h at 23 +/- 2 C. 4. Hang the panels in the humidity cabinet at 38 +/- 1 C and a relative humidity of 95 - 100 % for the time required by the applicable Engineering Material Specification or the Manufacturing Standard. 5. At the end of the exposure peri
10、od, examine the panels for corrosion and evaluate as follows: . Lay the transparent grid containing 6.4 mm squares over the part and squares containing one or more concerns (i.e., corrosion). Do this for the entire surface. . Divide the number of 6.4 mm squares containing concerns by the total numbe
11、r of squares covering the surface. This figure x 100 = percent overall corrosion. EXAMPLE: With a panel that has 183 squares and if the number of squares containing one or more concerns was 35, then 35 x 100 = 19.1 % overall corrosion 183 6. Report results of the test based upon comparison of the te
12、st material with the approved sample. If no corrosion is evident on the untreated panel, the test shall be rerun. EXAMPLE: Panel with test material Panel with approved material Untreated panel 20 % corrosion 2 % corrosion 100 % corrosion 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.
