1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2015 02 10 Revised See Summary of Revisions U. Mueller, EU 2009 06 24 Revised U. Mueller 1999 03 08 Activated K. Wolters Controlled document at www.MATS Copyright 2015, Ford Global Technologies, LLC Page 1 of 4 WAX COATING PERFORMANCE,
2、 CORROSION PROTECTION, WSS-M21P35-A AUTOMOTIVE CAVITIES WAX COATING PERFORMANCE, CORROSION PROTECTION, WSS-M21P35-A2 AUTOMOTIVE CAVITIES, ODOR APPROVED 1. SCOPE These specifications define the performance requirements of corrosion protective waxes for vehicle cavities. Cavity waxes can compensate in
3、sufficiencies in the application processes for phosphate, electrocoat, sealer and paint and improve corrosion resistance by penetrating into spot welded joints, clinch/hem flanges and other crevices which are not or only incompletely filled with sealer or adhesive. Wax according to these specificati
4、ons is designed for a nominal film thickness of 25 - 40 um. The specification does not restrict the type of material but covers low, medium and high solid conventional waxes as well as water based and solvent free materials. 2. APPLICATION These specifications were released originally for cavity wax
5、es sprayed into box sections below the floor panel (rocker panel, side and cross members, etc.), in the engine compartment and to lower areas of pillars, doors, hood and tailgate. They are applied to the vehicle body after the paint process, prior to final assembly. 3. REQUIREMENTS 3.1 STANDARD REQU
6、IREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). Part producers using this material in their products, must use Ford approved materials and must conform to a process control plan whic
7、h has been approved by STA and/or the relevant Materials Activity. 3.2 MATERIAL PROPERTIES Special properties (e.g. suitability for use in locations with tropical climate, possibility for accelerated drying, etc.) or restrictions (protection from freezing, etc.) must be noted in the initial approval
8、 documents. ENGINEERING MATERIAL SPECIFICATION WSS-M21P35-A/A2 Copyright 2015, Ford Global Technologies, LLC Page 2 of 4 3.3 PERFORMANCE OF THE DRY WAX FILM 3.3.1 Surface film Wax material must be suitable for form a closed continuous film without, voids and bubbles in areas specified by Product Dev
9、elopment. After drying the wax shall be sufficiently hard to withstand normal handling during final assembly without damage. It may be tacky but must not stain cables, trim parts or clothing. 3.3.2 Water Resistance The wax film shall be resistant against water impingement immediately after drying. 3
10、.3.3 Temperature Resistance 5 mm max (1 h at 110 +/- 2 C) Apply 40 micrometer wax to one half of a painted panel (mark the edge) and dry. Place the panel vertically for 1 hour in a convection oven, wax coated side up. 3.3.4 Crack Resistance No cracks, voids or (FLTM BJ 128-03, 72 h at 23 +/- 2 C) sh
11、rinkage allowed. 3.3.5 Low Temperature Resistance No cracking (ASTM D 522, Method B, - 30 C) Apply 40 micrometer wax to a test panels and place it in a cold box for 24 hours, together with a mandrel of 30 mm diameter. While in the cold box, bend the panel 180 over the mandrel. 3.3.6 Odor (for A2 onl
12、y) Rating 3 max (FLTM BO 131-03, Condition 1 and 2) 3.4 CORROSION RESISTANCE, LABORATORY Lab tests are for comparison only. They shall be performed on standard test panels at 30 - 40 micrometer film thickness. Lab test results are predominated by results from the proving ground evaluation. 3.4.1 Res
13、istance to Accelerated Cyclic Corrosion (CETP 00.00-L-467) Zn-coated and CRS steel: 2 weeks Evaluation after removing of the wax: No corrosion on the panel surface and not more than 3 mm rust creepage from edges. ENGINEERING MATERIAL SPECIFICATION WSS-M21P35-A/A2 Copyright 2015, Ford Global Technolo
14、gies, LLC Page 3 of 4 3.4.2 Humidity Resistance 120 h (40 +/- 2 C and 98 +/- 2% R.H.) Place test panels in a humidity cabinet (condensing water on wax panel surface, 15 - 30 to the vertical). No rust on the panel surface, no blisters, no slipping of the wax or any damages of the film allowed. Slight
15、 dulling may be accepted if reversible within 24 hours after test end. 3.5 CORROSION RESISTANCE, PROVING GROUND New material technologies require CETP 00.00-R343 approval prior to their introduction. Test details including film thickness, method of application, number of test cycles, etc. for the in
16、dividual cars are defined by Materials Engineering, AVT. 3.6 REMOVAL 3.6.1 In Production The wax must be removable from production facilities (body skids, etc.) in the cleaning operation of the phosphating process. 3.6.2 Surfaces/Finishes The wax film must be removable from automotive body and plast
17、ic topcoats, unpainted plastic surfaces (bumpers, grills, etc.) and rubber parts at any time without damaging the surface. The supplier must recommend a suitable solvent or cleaning process. 3.7 STAINING ON PAINTED SURFACES (FLTM BJ 128-04, oven only) The wax must not stain, soften, lift, or otherwi
18、se degrade current production or repair body and plastic paint materials. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. Contact for questions concerning Engineering Material Specifications. 4.1 MA
19、TERIAL REFERENCE All related materials used for approval of cavity wax according to this specification, e.g. substrate, paint materials, solvents, etc. as well as the application parameter (viscosity, film thickness, drying conditions) shall be noted in the Initial Sample Report of the wax. 4.2 CORR
20、OSION PERFORMANCE The corrosion performance of individual vehicle bodies is determined by wax material and application, sealer/adhesive material and fill grade, metal substrate and part design. Good corrosion performance requires uniform wax coating which can only be achieved by automatic applicatio
21、n. ENGINEERING MATERIAL SPECIFICATION WSS-M21P35-A/A2 Copyright 2015, Ford Global Technologies, LLC Page 4 of 4 4.3 DRIPPING Wax according to this specification may be dripping from the vehicle body after the application, before the material has dried. Dripping depends primarily on cavity design and
22、 wax application parameter. Corrective actions should concentrate on these aspects. If however the wax material needs to be modified, special attention must be paid to creeping power and flow at temperature (Requirement of the appropriate material specification). 5. SUMMARY OF REVISIONS 2015 02 10 Deleted 3.4.1 salt spray Corrected 3.3.1, 3.3.6, 3.4.2, 3.5
