1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2007 08 31 Revised Format Update Only 2002 07 24 Revised Revised 3.5 with specific Cr6+ statement B. Burnside 1987 07 31 Released SM/ER 1108TC J P C Lines EAO Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page
2、1 of 2 CORROSION PROTECTIVE COATING WSD-M21P10-B1 ORGANIC TYPE - 72 H CORROSION PROTECTIVE COATING WSD-M21P10-B2 ORGANIC TYPE - 120 H CORROSION PROTECTIVE COATING WSD-M21P10-B3 ORGANIC TYPE - 240 H 1. SCOPE These specifications define the performance levels of low temperature heat cured corrosion pr
3、otection coatings for steel. B2 and B3 have oil/wax surface films or a self lubrication constituent. For maximum corrosion resistance B3 may be optionally oil sealed. 2. APPLICATION These specifications were released originally for coating of higher strength steels where hydrogen embrittlement as a
4、result of electroplating may be induced. 3. REQUIREMENTS 3.1 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 The coating shall be a uniform color as speci
5、fied on the engineering drawing and shall be free from discontinuities. The coating shall be sufficiently cured to withstand normal handling, shipping, storage and installation without significant damage, flaking or peeling or other loss of adhesion. For all types the color and gloss level shall be
6、specified on the engineering drawing. 3.3 CORROSION RESISTANCE Finished components shall be tested in accordance with ASTM B 117. After the specified test time, without using supplementary magnification, one red rust spot per 1600 mm2 of significant surface area is acceptable provided the spot is no
7、 greater than 1.5 mm in diameter. B1 72 h B2 120 h B3 240 h Significant surfaces are those surfaces visible on a part as normally assembled, or surfaces which can be the source of corrosion products visible on an assembled vehicle. ENGINEERING MATERIAL SPECIFICATION WSD-M21P10-B1/B2/B3 Printed copie
8、s are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 2 of 2 3.4 COATING MASS AND THICKNESS Coating Mass Minimum Local (Guidance value) Thickness g/m2 min mm B1 15 0.005 B2 15 0.005 B3 - 0.005 As there is no simple strip and weigh test method the coating mass has been included for gu
9、idance only. The local 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 respons
10、ible engineer for threaded 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
11、 have any adverse effect 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 an appropriate size bolt to 6g standard dimensions. 3.5 CLEANING Prior to coating, the parts shall be free of
12、 oil, scale and similar foreign materials. The cleaning process shall have no detrimental effect on the substrate and shall leave it free from embrittlement. Suitable pre-treatments for B1 and B2 are shot blasting and/or zinc phosphate coating. B3 can be shot blasted followed by phosphate coating an
13、d hexavalent chromium free rinse. Due to shape and form mechanical cleaning may not be adequate alone. The phosphate coating shall have a minimum coating mass of 7.5 g/m2. 3.6 LUBRICATION Where the coating does not contain a self lubricating constituent, finished parts coated with B2 shall be coated
14、 with an oil/wax film as the final process. Maximum corrosion resistance of B3 is obtained by oil sealing. These oil films shall be dry to touch. 3.7 TORQUE TENSION RELATION B2 and B3 possess lubricating properties. When used on threaded components the coatings shall meet the performance requirement
15、s of WZ100. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 4.1 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 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.
