1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Release No. Release/Revision 2011 02 25 No replacement named. No longer in use. G. Weber, NA A1 N-STATUS 1991 02 27 NC00E1009284100(SP) Released RFW K Gribble L Mastrofrancesco WP 3948-a Page 1 of 4 CORROSION PROTECTIVE COAT
2、ING, SOLID FILM ESA-M21P24-A1 LUBRICANT 96 h SALT SPRAY NOT TO BE USED FOR NEW DESIGN CORROSION PROTECTIVE COATING, SOLID FILM ESA-M21P24-A2 LUBRICANT 500 h SALT SPRAY 1. SCOPE These specifications define the performance of two solid film lubricant coatings containing molybdenum disulphide and other
3、 lubricating pigments. They are intended to be utilized on metallic parts to materially lower the coefficient of friction, reduce wear, minimize metallic adhesion of parts operating dry, and provide good corrosion resistance. They are non-electrolytic type coatings which are suitable for use with he
4、at treated components (will not induce hydrogen embrittlement). 2. APPLICATION These specifications were released originally for friction/wear applications where the unit loading exceeds 35 MPa (for applications where unit loading is less than 35 MPa consult Ford Specification ESF-M21P8-A). 3. REQUI
5、REMENTS 3.1 STATISTICAL PROCESS Suppliers must conform to the requirements of Ford Quality System Standard Q-101. A mutually acceptable Control Plan as described therein is required for material/source approval. Appropriate statistical tools must be used to analyze process/product data so that varia
6、tion in the final product is continuously reduced. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermograms established for initial approval
7、shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. 3.3 CONDITIONING AND TEST CONDITIONS All test values indicate
8、d 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. ENGINEERING MATERIAL SPECIFICATION ESA-M21P24-A1/A2 WP 3948-b Page 2 of 4 3.4
9、APPLICATION CHARACTERISTICS These materials are suitable for applications where either the entire part or portions thereof are to be coated. This can be accomplished by spraying or dipping the pretreated part. The proper pretreatment of each part shall be specified on the Engineering drawing. 3.5 AP
10、PEARANCE The parts as coated shall be dull charcoal gray to black in color, uniform in coverage and free from visual imperfections such as cracks, chips, tears or contaminants. 3.6 FILM THICKNESS The coating thickness shall be 5 - 20 micrometres or as specified on the Engineering drawing and adequat
11、e to meet the specified salt spray resistance. 3.7 FILM PROPERTIES Tests are to be completed on components whenever possible. The following test results were run on test panels and are used to establish a baseline for qualification. Test results on component parts may vary and underscore the need to
12、 run tests on the actual components. In all cases, application of the coating must be done by an approved source as the proper application of the material is as important as the material itself. A1 A2 3.7.1 Coefficient of Friction .02 - .07 .02 - .07 (ASTM D 2714) 3.7.2 Endurance Life (ASTM D 2625,
13、Procedure A) Average 450 minutes 350 minutes Minimum 390 minutes 250 minutes 3.7.3 Load Carrying Capacity 13.3 kN 11.1 kN 3.7.4 Adhesion Grade 0 (FLTM BI 106-01, zinc phosphated panels) The coating must not chip, flake or expose any base metal surface. A uniform deposit of powdery material clinging
14、to the tape shall not be objectionable. ENGINEERING MATERIAL SPECIFICATION ESA-M21P24-A1/A2 WP 3948-b Page 3 of 4 3.7.5 Thermal Stability (ASTM D 2511) These materials remain stable within the temperature range of - 220 to + 260 C. 3.8 CURE As a check for the proper curing of the solid film lubrican
15、t, a swab dipped in methyl ethyl ketone shall be rubbed across the coated surface under moderate pressure five times without exposing bare metal. A slight discoloration from the lubricating pigment is not objectionable. A1 A2 3.9 CORROSION RESISTANCE (ASTM B 117) Zinc phosphated panels, 18 micrometr
16、e 96 h 500 h dry film thickness Engineering drawing to specify required minimum corrosion resistance (0 - 500 h). Higher corrosion resistance equates to higher costs generally. 3.10 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the
17、 material upon which approval was originally granted. Prior to making any change in the properties, composition, construction, color, processing or labeling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specificatio
18、n requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials Engineering activity of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification are to be submitted with the request.
19、Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1, unless a different suffix (e.g., A2 or A3) is specified on the engineering document for the application.
20、ENGINEERING MATERIAL SPECIFICATION ESA-M21P24-A1/A2 WP 3948-b Page 4 of 4 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of in
21、terest from the affected Purchasing, Design and Materials Engineering activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstr
22、ating full compliance with all the requirements of this specification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. In addition to meeting the requirements of this specification, the materials will be assessed for suitability for intended applications as part of the approval process. Upon approval, the material will be added to the Engineering Material Approved Source List.
