1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 19 Revised Updated paragraph 3.5.2, added paragraph 5 G. Weber 2006 09 13 Revised Paragraph 3.4.3 added 16 hour soak A. Cockman 2004 09 20 Activated A. Cockman, J Luther Printed copies are uncontrolled Copyright 2009, Ford Global Techn
2、ologies, LLC Page 1 of 4 CORROSION PROTECTIVE COATING, SILVER/SILVER GRAY WSS-M21P45-A1 CORROSION PROTECTIVE COATING, BLACK WSS-M21P45-A2 1. SCOPE The materials defined by these specifications are corrosion protective coatings over steel. These coating systems provide corrosion protection and color
3、and are intended for Spring Band Hoseclamps. These coatings are free of chromium, nickel, lead and cadmium. 2. APPLICATION These specifications were released originally for materials used for corrosion protective coatings over steel. They are intended for Constant Tension Spring Band Hoseclamps wher
4、e a high level of corrosion protection is required. 2.1 SERVICE TEMPERATURE The maximum continuous service temperature resistance is 200 C. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Ma
5、terial suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 LICENSEE APPLICATOR QUALITY REQUIREMENTS Applicators must follow coating manufacturer procedures and recommendations for chemical usage, equipment and processing. 3.3
6、 MATERIAL PERFORMANCE 3.3.1 Raw Material Storage Stability The material must be capable of being stored at 23 +/- 2 C for 60 days without detrimental effect to the performance of the coated parts. 3.3.2 Cleaning Prior to coating, the parts shall be free of oil, scale, and similar foreign materials.
7、The cleaning process shall have no detrimental effect on the substrate, including freedom from embrittlement. ENGINEERING MATERIAL SPECIFICATIONWSS-M21P45-A1/A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 4 3.3.3 Curing These coatings are typically cured at
8、 200 to 220 C. Alternative cure temperatures may be used provided mechanical properties of the clamp are not affected. Parts must be sufficiently cured at the time of packing to withstand normal handling and shipping without marring. 3.3.4 Appearance A1 Uniform silver/silver gray A2 Uniform black Th
9、e coating shall be uniform in color and free from discontinuities when viewed without magnification. Where part grounding is required to apply the finish the grounding point shall be on the tang of the clamp and shall not impact clamp performance. 3.3.5 Storage Life Parts supplied shall still meet t
10、he specific requirements of this specification 6 months after receipt by Ford when stored at 5 to 28 C with no direct heat or sunlight. 3.4 ADHESION 3.4.1 The cured coating shall withstand normal handling, storage and installation without flaking or peeling or other loss of adhesion. 3.4.2 Parts hea
11、ted to 120 C for 60 minutes shall not exhibit blistering, peeling, flaking or coating which can be removed by a filament type tape, such as 3M No. 898-2. The testing of coating quality by salt spray and/or determination of coating thickness will be performed on parts passing the adhesion test. 3.4.3
12、 Hoseclamps may be used in Pre-Opened, Pre-Positioned (POPP) applications; these are applications where the hoseclamp is glued to the hose to assist assembly. After a 16 hour soak at a relative humidity of 95% min. the adhesion of the coating shall be sufficient to withstand a load of 34Kg applied t
13、o the tangs in a horizontal or radial direction and shall meet the following requirements: 3.4.3.1 There shall be no separation of the coating and substrate. 3.4.3.2 There shall be no separation between coating layers. 3.5 RESISTANCE PROPERTIES PRECONDITIONING Prior to performing the restistance tes
14、ts, the finished clamps shall undergo the following procedure to simulate handling and transportation damage: a) Fill a cardboard box full of clamps to be tested. (No larger than 250X250X250) b) Secure the box thoroughly to prevent it from breaking open. c) Slowly slide the box off of a surface 0.75
15、 meters onto the floor. d) Repeat step c 30 times, alternating between top, side and bottom of box. ENGINEERING MATERIAL SPECIFICATIONWSS-M21P45-A1/A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 4 3.5.1 Sodium Hypochlorite Resistance The following procedure
16、 is used for new coating approvals or for in-process testing of approved coatings. New coating approvals shall use a minimum sample size of 30 clamps. After coating clamps of sizes Dn41 with the specified coating, thirty clamps shall be assembled on a PVC plastic mandrel 0.2 to 0.3 mm smaller than t
17、he full open diameter. The assembly shall be immersed in 2000 ml +/- 50 ml of 4.95 - 5.05% sodium hypochlorite solution at 21 +/- 3 C, there shall be no evidence of cracking after 28 hours immersion. The Sodium Hypochlorite SCC Test Solution shall be assayed within 72 hours prior to test per the fol
18、lowing procedure adapted from US Pharmacopeia*. Weigh accurately, in glass flask 10 g of Sodium Hypochlorite SCC Test Solution, and dilute with 40 ml water. Add 0.4 g potassium iodide and 2 ml 6 N acetic acid, titrate the liberated iodine with 0.010 N sodium thiosulfate, adding 1 ml of starch TS as
19、the endpoint is approached. Note, the solution is dark with a clear endpoint, so a white background is required for an accurate end point determination. Perform a blank determination, and make any necessary correction. Each ml of 0.010 N sodium thiosulfate is equivalent to 0.3722 mg of NaOCl. *US Ph
20、armacopeia analysis is for 4 to 6% NaOCl and has been adjusted for this dilute analysis. 3.5.2 Corrosion Resistance (CETP 00.00-R-343) Hoseclamps coated to these specifications shall meet the General Requirements of WX100. Hoseclamps shall be free of red rust after 6 weeks of the Global 12-Week Tota
21、l Vehicle Accelerated Corrosion Test. 3.5.3 Water Resistance (FLTM BI 104-01) Shall not blister or show any signs of red rust when subjected to immersion in water for 240 hours. 3.5.4 Gasoline Resistance Shall not blister or show any signs of softening or dulling when subjected to immersion in curre
22、nt factory fill gasoline for 24 hours at 23 +/- 2 C. 3.5.5 Hot Oil Resistance Shall not blister or show any signs of softening or dulling when subjected to immersion in engine oil (SAE 10W30 per WSE-M2C903-A2 or equiv.) for 24 hours at 66 +/- 3 C. 3.5.6 Ethylene Glycol Resistance Shall not blister o
23、r show any signs of softening or dulling when subjected to immersion in a 50% solution of water and long life coolant concentrate (WSE-M97B44-B or equivalent) for 24 hours at 23 +/- 2 C. ENGINEERING MATERIAL SPECIFICATIONWSS-M21P45-A1/A2Printed copies are uncontrolled Copyright 2009, Ford Global Tec
24、hnologies, LLC Page 4 of 4 3.5.7 Brake Fluid Resistance Shall not blister or show any signs of softening or dulling when subjected to immersion in currently approved brake fluid for 24 hours at 23 +/- 2 C. 3.5.8 Power Steering/Transmission Fluid Shall not blister or show any signs of softening or du
25、lling when subjected to immersion in current factory fill power steering and transmission fluid for 24 hours at 66 +/- 3 C. 3.6 COATING THICKNESS Because of the intended use on Constant Tension Spring Band Hoseclamps the coating thickness is not a significant requirement. However the coating thickne
26、ss shall not inhibit other performance requirements of this specification or the installation or function of the hoseclamp. 3.7 FINISH FRICTION Finishes to these specifications shall meet the Torque/Clamping Force Performance Requirements of WZ 101 (Test Program B). Note: While WZ 101 is specificall
27、y for threaded fasteners, finish friction is important to the functional performance of hoseclamps to prevent hose bunching under the clamp. The coefficient of total friction (tot) of the top coat(s) shall not exceed 0.18. 4. GENERAL INFORMATION The information given below is provided for clarificat
28、ion and assistance in meeting the requirements of these specifications. 4.1 CORROSION RESISTANCE (SAE/USCAR-1) Hoseclamps tested and evaluated in accordance with SAE/USCAR-1, typically pass a minimum of 120 hours without non-ferrous (white) corrosion and 480 hours without ferrous (red) corrosion. 5. SUMMARY OF REVISIONS 2009 08 19 Changed paragraph 3.5.2 corrosion test method from FLTM BI 123-01 to CETP 00.00-R343 Changed paragraph 3.5.2 corrosion test requirement Added paragraph 5
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