FORD FLTM BV 123-1-2000 CORROSIVE AND ADHESIVE EFFECTS OF GASKET MATERIAL ON METAL SURFACES.pdf

1、 FORD LABORATORY TEST METHOD BV 123-01 Date Action Revisions 2000 12 11 Revised Editorial no technical change A. Cockman 1992 02 10 Printed copies are uncontrolled Page 1 of 5 Copyright 2000, Ford Global Technologies, Inc. CORROSIVE AND ADHESIVE EFFECTS OF GASKET MATERIAL ON METAL SURFACES Applicati

2、on This method is used to determine the corrosive and adhesive effects of gasket materials on metal surfaces. Apparatus Required Mechanical Convection Oven Capable of maintaining temperatures of 120 - 150 +/- 2 C. Humidity Cabinet The humidity cabinet must be maintained at 38 +/- 2 C and 95 to 100 %

3、 R.H. The moist air must be circulated in the cabinet by a fan or other suitable means. Test specimens must be suitably supported and arranged in the test cabinet so that no water can drip from one specimen onto another. Materials Required Tension Wrench Indicating applied torque graduated to includ

4、e 80 +/- 5 N-m on the scale. Glass Magnifier With a 3 - 5 x magnification. Forceps - Stainless steel. Flat Circular Plates Having an outside diameter of 50 mm and a thickness of 3 - 5 mm. A hole having a diameter of 14 mm shall be drilled through the center of each plate. The plates shall be chamfer

5、ed slightly on all edges. Both sides shall be machined sufficiently to assure good parallelism of the surfaces. One surface is to be ground with abrasive paper No. 400 until the plate is perceived visually to have a uniform finish. Material Plate “A“: DIN 1725: G-A1 Si 8 Cu 3 Aluminum Sand Cast. Opt

6、ional: B.S. 1490: LM4M, Aluminum Sand Cast. Optional: SAE 327, Aluminum Sand Cast. FORD LABORATORY TEST METHOD BV 123-01 Page 2 of 5 Copyright 2000, Ford Global Technologies, Inc. Material Plate “B“: DIN 1691: GG-20, Gray Cast Iron. Optional: B.S. 1452: Grade 220, Gray Cast Iron. Optional: SAE G2500

7、, Gray Cast Iron. Material Plate “C“: Austenitic Stainless Steel Outside diameter of 50 mm and a minimum thickness of 15 mm. A hole having a diameter of 13 mm shall be drilled through the center of each plate. The plates shall be chamfered slightly on all edges. Both sides shall be machined sufficie

8、ntly to assure good parallelism of the surfaces. Source: Metal Samples Co., Inc. P.O. Box 8 Munford, AL 36268 USA Screw - M12 x 70 mm, Grade 8.8. Nut - M12 Washer - 13 x 30 x 4 mm, 2 required. Abrasive Paper - No. 400 Toluene - CAUTION: Low flash point. Molybdenum Disulfide - In powder or spray form

9、. 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 same conditions unless otherwise specified. Procedure Preparati

10、on of Test 1. Prepare 3 specimens of gasket material for each test. They shall be cut clearly and shall be free from burrs, loose fibers, and dirt. No foreign substances shall be used during the cutting operation for lubrication of the die or any other purpose where they may come in contact with the

11、 specimen. Specimens shall be cut with a 14 mm ID and a 40 mm OD die. 2. Wash the metal plates (A and B) with toluene to remove any traces of oil, grease, or other foreign substance. 3. Handle the plates with forceps after cleaning until the time of assembly. FORD LABORATORY TEST METHOD BV 123-01 Pa

12、ge 3 of 5 Copyright 2000, Ford Global Technologies, Inc. Test Procedure The following metal plate combinations are to be tested: Aluminum (Plate A) and Aluminum (Plate A) Cast Iron (Plate B) and Cast Iron (Plate B) Aluminum (Plate A) and Cast Iron (Plate B) 1. Assemble the Plates A and/or B with gas

13、ket test specimen, ground surface next to the test specimen, and Plates C on the top and the bottom to form a sandwich with the test specimen carefully centered between the Plates A and/or B (see Figure 1). 2. Lubricate the threads of screw very lightly using molybdenum disulfide in powder or spray

14、form (oil is not recommended). 3. Carefully insert the screw through the washer, the Plates including the test specimen, and the washer (also lubricated) on the top. Take care to avoid contamination of either the gasket material or Plates (A and/or B) surface with the lubricant (see Figure 1). 4. Ti

15、ghten the nut uniformly over a period of 10 s to a torque of 80 +/- 4 N-m or as specified by the relevant Engineering Materials Specification. 5. Place the assemblies in the mechanical convection oven for 70 h at 120 +/-2 C or 150 +/- 2 C, as specified in the applicable Engineering Material Specific

16、ation. 6. Upon completion of heat aging allow the assemblies to cool to 23 +/- 2 C before opening. 7. Rate for adhesion and/or corrosion as described under Evaluation. 8. Using new plate assemblies as prescribed in Procedure 1 - 4, place the assemblies in the humidity cabinet for 14 d. 9. Upon compl

17、etion of aging allow the assemblies to cool to 23 +/- 2 C before opening. 10. Rate for adhesion and/or corrosion as described under Evaluation. Evaluation Degree of Adhesion 1. Separate the specimen from the plate manually if either surface has adhered to the plate. 2. Note the degree of adhesion nu

18、merically by applying the following rating system: Rating 1: Complete separation of both plates. No indication of adhesion. Rating 2: Slight forcing is necessary to separate plates. Moderate adhesion to 1 plate but specimen can be separated cleanly. FORD LABORATORY TEST METHOD BV 123-01 Page 4 of 5

19、Copyright 2000, Ford Global Technologies, Inc. Rating 3: Considerable forcing is necessary to separate plates. Considerable adhesion to 1 plate but specimen can be separated cleanly. Rating 4: Considerable forcing is necessary to separate plates. Considerable adhesion to one plate. Specimen can be s

20、eparated in 1 piece but surface fibers remain adhering to 1 or both plates. Rating 5: Specimen is torn or delaminated upon separation of plates. Cannot be removed from plates without further tearing. Must be scraped from the plates for complete removal. Degree of Corrosion 1. After removal of the sp

21、ecimens, examine both plates carefully for surface stain and corrosion, using a 3 - 5 x magnifying glass as necessary. 2. Note the degree to corrosion numerically by applying the following rating system: Rating 1: No surface stain or corrosion. Rating 2: Surface stain or discoloration present but no

22、t corrosion as defined by pitting or erosion of 1 or both plates. Rating 3: Trace of corrosion. A few small spots on plates with faint out-line of parts of specimen. Rating 5: Moderate corrosion. Numerous corroded areas on plates. Rating 6: Excessive corrosion. Plates completely corroded with consid

23、erable pitting or erosion. Note: In the case of excessive adhesion, a thin knife or steel blade may be used to separate the plates. Exercise care to avoid damage to plates or specimens. Disregard adhering fibers and corrosion within 2 mm of outer diameter of the contact. Chemicals, materials, parts,

24、 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. FORD LABORATORY TEST METHOD BV 123-01 Page 5 of 5 Copyright 2000, Ford Global Technologies, Inc. CORROSIVE AND ADHESIVE EFFECTS OF GASKET MATERIAL ON METAL SURFACES Figure 1