1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 05 2015 01 27 Revised Separated from B3/B5 G. Weber, NA 2012 12 04 B1 N Status Replaced by WSS-M21P42-A3 G. Weber, NA 2011 02 24 B3/B5 N-STATUS No replacement named. No longer in use. G. Weber, NA 1987 06 30 SM/ER 4896TC Released. J. P. C
2、 Lines EAO Controlled document at www.MATS Copyright 2015, Ford Global Technologies, LLC Page 1 of 3 CORROSION PROTECTIVE COATING WSD-M21P11-B1 ZINC ORGANIC TYPE, 480 H, SILVER NOT TO BE USED FOR NEW DESIGN CORROSION PROTECTIVE COATING WSD-M21P11-B2 ZINC ORGANIC TYPE, 480 H, COLORED 1. SCOPE These
3、specifications define the performance levels of proprietary corrosion protection coatings for steel which are low temperature heat cured from a solvent based dispersion of aluminum, zinc flake and/or zinc particles and organic materials. 2. APPLICATION These specifications were released originally f
4、or a corrosion protection coating on steel. Since hydrogen embrittlement is not induced, these coatings are suitable for springs and other high hardness parts. Because of the relatively low baking temperatures of 185 - 210 C these coatings are suitable for many cold worked spring materials. 3. REQUI
5、REMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 APPEARANCE B1 The coating shall be a uniform silver/silver grey color and free from discontinuities. Note
6、 When this coating is specified B2 color silver may be supplied as an alternative. B2 The coating shall consist of a base coat of Type B1 with a top color-coat of WSD-M21P10-B2. The color and gloss level shall be specified on the engineering drawing. B3 The coating shall be a uniform matt black col
7、or and free from discontinuities. B5 The coating shall be of Type B2 color silver, for exceptions see clauses 3.3, and 3.4. ENGINEERING MATERIAL SPECIFICATION WSD-M21P11-B1/B2 Copyright 2015, Ford Global Technologies, LLC Page 2 of 3 3.3 CORROSION RESISTANCE WSD-M21P11-B1, B2 480 h ferrous Finished
8、components shall be tested in accordance with ASTM B 117. After the specified test time the components shall show no corrosion products on significant surfaces. Significant surfaces are those surfaces visible on a part as normally assembled, or surfaces which can be the source of corrosion products
9、visible on an assembled vehicle. 3.5 COATING MASS AND THICKNESS COATING MASS MINIMUM LOCAL (Guidance value) THICKNESS g/m2 min mm WSD-M21P11-B1 28 0.008 WSD-M21P11-B2 BASE COAT 25 0.008 As there is no simple strip and weigh test method the coating mass has been included for guidance only. The local
10、thickness includes the effect of any phosphate coating and shall be determined according to Ford Laboratory Test Method BI 117-01. Undersizing of threaded components is not permitted without prior approval of Engineering Standards for standard and utility parts, or the responsible engineer for threa
11、ded production parts. The coating may be thicker at thread roots and in recesses, and thinner at crests and edges. Tightness to thread inspection ring gauges may be experienced, however, the coating thickness shall not adversely affect the mechanical performance of the part or have any adverse effec
12、t on normal installation and removal practices. It is recommended that coated threaded components are checked with an appropriate size nut to 6H standard dimensions or appropriate size bolt to 6g standard dimensions. 3.6 CLEANING Prior to coating, the parts shall be free of oil, scale and similar fo
13、reign materials. The cleaning process shall have no detrimental effect on the substrate and shall leave it free from embrittlement. Suitable pre-treatments are shot blasting and zinc phosphate coating with hexavalent chromium free rinse. Due to shape and form mechanical cleaning may not be adequate
14、alone. Where phosphating is used the minimum phosphate coating mass shall be 7.5 g/m2. 3.7 ADHESION The coating shall withstand normal handling, storage and installation without flaking or peeling or other loss of adhesion. 3.8 TORQUE/CLAMPING FORCE REQUIREMENTS By use of suitable additives the coat
15、ing can possess self lubricating properties. When used on ISO Metric threaded components the coating shall meet the performance requirements of WZ100. ENGINEERING MATERIAL SPECIFICATION WSD-M21P11-B1/B2 Copyright 2015, Ford Global Technologies, LLC Page 3 of 3 5. GENERAL INFORMATION The information
16、given below is provided for clarification and assistance in meeting the requirements of these specifications. 5.1 FUNCTIONAL CONSIDERATION Due to hydraulic lock up in processing, parts with flat surfaces which may be mated e.g. flat washers or parts that nest together may not be suitable for coating
17、 by this process without specialized processing techniques. Due to the coating build up in recesses, parts with internal drive systems and parts with small holes may also require specialized process techniques. 5.3 VEHICLE CORROSION TESTING (CETP:00.00-R-3H) Ford Motor Company, at its option, may conduct proving ground corrosion tests of materials/parts supplied to these specifications. The results of these tests shall be used to establish approval of new material sources and may be used to control quality of existing sources.
