1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2012 04 12 N Status No usage or replacement N. Benipal, NA 2004 03 22 Revised Pare 3.0 inserted; paras 3.1, 3.2, 3.7 and 4 deleted 1996 10 18 Activated M. Siddiqi Controlled document at www.MATS Copyright 2012, Ford Global Technologies
2、, LLC Page 1 of 4 RUST PREVENTIVE - HOT MELT WSS-M7C67-A3 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a solvent-free hot melt, dip applied rust and corrosion preventive compound, generally a mixture of waxes and resins. It shall be free of any fibrous fillers
3、 such as asbestos. 2. APPLICATION This specification was released originally for material used to provide corrosion protection for chassis components such as frames where handling is infrequent. It will also provide protection against cold cracking. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PROD
4、UCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.3 APPLICATION CHARACTERISTICS Shall be suitable for dip application in a conventional hot melt system. The rust preventative must form a homogenous s
5、table, non-corrosive, protective film free of sediment or other contaminants. A typical film thickness of 75 - 125 micrometer can be expected at the application temperature of 121 143 C. 3.4 PHYSICAL PROPERTIES 3.4.1 Color Black 3.4.2 Flash Point, min 200 C (ASTM D 93) 3.4.3 Weight per Volume (ASTM
6、D 816) At 25 C to 121 C 0.80 - 1.20 kg/L 3.4.4 Solids Content, min 97.0% (ASTM D 2834, except bake a 20 g sample for 24 h at 121 +/- 3 C) 3.4.4.1 Solids Content, min 97.0% (EPA Method 24) 3.4.4.2 Ash Content, max 18% (ASTM D 1951) ENGINEERING MATERIAL SPECIFICATION WSS-M7C67-A3 Copyright 2012, Ford
7、Global Technologies, LLC Page 2 of 4 3.4.5 Viscosity at 120 C 90 - 250 mPa.s (Brookfield RVF Viscometer No. 1 spindle pre-heated at 120 C, 10 rpm, 60 s reading) 3.4.6 Shelf Stability All physical (After standing for a 2 month and performance period at 121 C, constant, requirements slow agitation) mu
8、st be met 3.4.7 Hardness (ASTM D 1321) At 25 C, max 65 At 32 C, max 150 3.4.8 Removal Petroleum solvent, kerosene, approved chlorinated solvent or vapor degreasing. 3.4.9 Melt Flow Indicator 3.4.9.1 Requirement A No dripping of material after being suspended 4 h vertically at 100 C (212 F) with 75-1
9、25 micrometer film thickness. 3.4.9.2 Requirement B No dripping of material after being suspended 4 h vertically at 95 C (203 F) with 950-1050 micrometer film thickness. Test Method: Prepare panels (hole at both ends) according to Paragraph 3.5.2. Allow them to dry for 24 h at 23 C +/- 2 C. Invert p
10、anels and suspend vertically in an oven for 4 h at the temperature and film thickness shown above. Any dripping or icicling of the rust preventative material is considered a failure. 3.5 PREPARATION OF TEST PANELS 3.5.1 Substrate Hot Rolled Steel P & O, 100 x 300 mm, 2 to 3 mm thick (Reference para
11、5.1). 3.5.2 Application Procedure Prior to dip coating, alkaline clean and tap rinse panels until water breaks free. Condition test panels and the rust preventive in oven at 121 - 143 C. The test coating should be applied to a film thickness of 75 to 125 micrometer and allowed to age 72 h before per
12、formance testing. For coating panels to a film thickness of 950 - 1050 micrometer, prepare panels (with hole at both ends) to 75 - 125 micrometer. Allow panels to cool to room temperature and then remove drips from the edge. Invert panels and recoat for not more than 5 seconds to obtain a thickness
13、of 950 - 1050 micrometer. ENGINEERING MATERIAL SPECIFICATION WSS-M7C67-A3 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.5.3 Scribing Tool For tests which require a scribe on the test panel, a straight shank, tungsten carbide tip lathe cutting tool shall be used. The single point tip wi
14、ll have an included angle of 60 +/- 15. This requirement can be met by using a carbide industry code “E“ thread cutting tool. 3.6 RESISTANCE PROPERTIES 3.6.1 Gravelometer/Salt Spray Better than 4B (SAE J 400) after (SAE J400/ASTM B 117/ - 30 C gravelometer ASTM D 610) ASTM D 610 rust grade 5 or bett
15、er after gravelometer/336 h salt spray Test Method: Run gravelometer test after conditioning panels 4 h at - 30 C. Age 24 h at room temperature, then subject to 336 h salt spray. Face rust evaluation shall be determined with the rust preventive material removed from panel. 3.6.2 Scribed Salt Spray C
16、orrosion creepback or loss of (FLTM BI 103-01) adhesion shall not exceed 3 mm either side of scribe centerline after 1000 h of salt spray. Test Method: Scribe an “X“ through material film and age 24 h. Expose test sample to 1000 h salt spray according to ASTM B 117. Within 15 minutes after completin
17、g salt spray, the panel scribe shall be subjected to high pressure air using a 3 mm nonrestricted nozzle set directly in contact with the panel at a 45 angle. Air flow pressure should be set at 550 kPa. The hose ID shall be 6 - 10 mm and the hose length from the regulator to nozzle shall be no great
18、er than 3 meters. 3.6.3 Weather Resistance/ No greater than 3 mm creep or Salt Spray rust, no “mud“ cracking or other (FLTM BO 101-01 or QUV surface defects. Slight gloss Thermal Aging (QFS 40 change O.K. bulb) per SAE J1804/ ASTM B 117) Test Method: Expose test sample to 100 h of Weatherometer acco
19、rding to FLTM BO 101-01 or QUV Cycle. Scribe an “X“ through material film and age 24 h followed by 336 h of salt spray per ASTM B 117. Perform blow-off procedure in para 3.6.2. 3.6.4 Detergent Wash No blistering, loss of adhesion Resistance or permanent change in color. (Detergent solution is compos
20、ed of 2.5 g Car Wash Concentrate or equivalent per liter of water) Test Method: Immerse panel in detergent solution at 50 C. Rinse panel with 50 C tap water through spray nozzle set at 70 kPa pressure and positioned 250 mm from panel. ENGINEERING MATERIAL SPECIFICATION WSS-M7C67-A3 Copyright 2012, F
21、ord Global Technologies, LLC Page 4 of 4 3.6.5 Cold Cracking No loss of adhesion, minor cracking Resistance acceptable Test Method: Prepare panels per para 3.5.2 to a film thickness of 950 - 1050 micrometer. Let the wax congeal for about 1 minute at room temperature and then subject the panels to -
22、30 for 60 hours. Examine the panels for signs of cracking. Check adhesion properties by inserting a knife blade (perpendicular to the panel) in to the suspected crack and then try lifting the wax off the panel by forcing the knife blade under the film. Evaluation of the panels should be done before
23、the panels reach room temperature. 3.6.6 Proving Ground Resistance (CETP 00.00-R-311 (P3-76-A) Component shall comply with the WPAS Corporate Corrosion Guidelines of the WCR for appearance and function. This test may be waived by the affected product engineering office. 5. GENERAL INFORMATION The in
24、formation given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 PANEL INFORMATION Hot rolled test panels are manufactured from commercial quality hot rolled steel. The panels are available from Advanced Coating Technologies Inc. (ACT). ACT P.O. Box 735 Hillsdale, MI 49242 ACT Product Code - APR 14312
