1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Ver. 4 2012 01 12 N-STATUS WSD-M1P65-B1 replaced by ASTM B733 Type IV SC2 Class 2 and -B2 replaced by ASTM B733 Type IV SC2 Class 1 G. Weber, FNA 2008 07 18 N-STATUS Replaced by ASTM B733 G. Weber, FNA 1987 12 11 Released SM/ER 1584 TC N. P.
2、Riley, EAO Controlled document at www.MATS Copyright 2012, Ford Global Technologies, LLC Page 1 of 4 PLATING, ELECTROLESS NICKEL, HEAT TREATED WSD-M1P65-B1 PLATING, ELECTROLESS NICKEL, AS DEPOSITED WSD-M1P65-B2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE These specifications define the performance charac
3、teristics of acceptable electroless nickel-phosphorus alloy platings for metallic substrates, in either the heat treated or as deposited condition. The coating process shall be lead and cadmium free. 2. APPLICATION These specifications are intended for rear axle differential pinion shafts, carbureto
4、r components or other parts where a combination of wear, abrasion and corrosion resistance is required. WSD-M1P65-B1 as deposited coating subsequently heat treated, intended for severe applications. WSD-M1P65-B2 as deposited coating, intended for general applications. 3. REQUIREMENTS Material specif
5、ication requirements are to be used for initial qualification of materials. 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 PLATING THICKNESS 0.010 0.018 mm or a
6、s specified on Engineering Drawings. TEST METHOD: The plating thickness shall be determined by the metallographic method or by suitable approved measuring instrument. In case of dispute the umpire method shall be of the metallographic method on a cross-section at a suitable magnification. 3.3 PHOSPH
7、ORUS CONTENT 4 - 11% The test method required to determine component plating phosphorus content may be dependant on the substrate composition and due consideration shall be taken of potential interferences or contamination. Process control may be undertaken by means of suitable test panel procedures
8、 providing correlation with component plating can be proven. Test procedures which may include surface analysis techniques shall be agreed as part of the component control plan. For information, a test procedure which has proven acceptable is listed in para 4.1. ENGINEERING MATERIAL SPECIFICATION WS
9、D-M1P65-B1/B2 Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 3.4 HEAT TREATMENT AFTER PLATING (WSD-M1P65-B1 ONLY) Heat treatment cycle shall be such as to attain the hardness specified in Paragraph 3.5. The exact cycle must be determined under production conditions. (In general, 1 hour at
10、 370 - 400 C has been found satisfactory). NOTE: Heat treatment may affect the substrate metal, particularly if it has been hardened to a level making it subject to tempering at the post-plating heat treat temperature. Designers must recognize this, and hardness notes pertaining to the substrate met
11、al must specify whether hardness is to be measured before or after post plating bake. 3.5 SURFACE HARDNESS WSD-M1P65-B1 HV750 minimum WSD-M1P65-B2 HV480 minimum TEST METHOD: Hardness to be determined on a suitable location on the finished part wherever possible. However, if this is not feasible, a t
12、est piece plated under the same conditions as the component may alternatively be used. If required to obtain valid hardness readings on thinly plated parts, the test piece may be left in the bath to increase coating depth. Where WSD-M1P65-A1 is specified, the test piece must accompany the production
13、 batch through the post plating heat treatment process, since hardness is critically dependent on both time and temperature in the heat treatment operation. 3.6 ADHESION The coating shall exhibit no lifting or separation from the substrate at the interface when examined at 4 - 10 diameters magnifica
14、tion. ADHESION TEST METHOD: Bend a test specimen through an angle of 180 C on a mandrel having a diameter equal to the thickness of the specimen. Using a sharp instrument attempt to detach the coating on the outside radius of the 180 C bend. When the coated components are not readily adaptable to th
15、e bend test, adhesion may be determined by bending or crushing the finished component to destruction. If neither of the above procedures are adaptable adhesion may be determined by cross-hatching the component surface to the substrate with a sharp cutting tool. Using a pressure sensitive tape press
16、firmly on the cross-hatched area and detach rapidly. NOTE: Observation for adhesion when performing the metallographic thickness determination is another means to verify adhesion properties. The heat treatment referred to in 3.4 also represents an opportunity to judge adhesion by the observance of b
17、listers which will occur if the parts are improperly cleaned prior to plating or poor plating practice is prevalent during the plating process. 3.7 CORROSION RESISTANCE (WSD-M1P65-B1 ONLY) 24 hours After 24 hours exposure (or as stated on the engineering drawing) no more than one red rust spot to be
18、 present per 1600 mm2 of significant surface area when examined by eye without the aid of supplementary magnification. No individual spot shall be greater than 1.5 mm diameter. ENGINEERING MATERIAL SPECIFICATION WSD-M1P65-B1/B2 Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.8 APPEARANCE
19、 The coating shall be smooth, adherent and free from visible blisters, pits, skips, nodules, porosity, gas streaks, cracks, frosty areas and other defects. The coating should also have a silvery, metallic appearance. Slight discoloration resulting from heat treatment shall not be cause for rejection
20、, providing the discoloration has not attained a bluish tint. When required the coating shall match the approved master sample available from the responsible materials engineering activity. 3.9 WORKMANSHIP/PLATING PRACTICE All details of workmanship and plating practice shall conform to the best for
21、 producing a high quality coating. 3.10 CLEANING Prior to electroless nickel plating, parts shall be cleaned according to Ford Manufacturing Standard MS 12-2 or by an alternative method e.g. ASTM B 322. 3.11 PLATED PARTS Specific requirements for physical properties of plated parts, when required, s
22、hall be as specified on Engineering Drawings. 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 TEST METHOD Strip plating with
23、 dilute nitric acid and dilute to given volume. Determine total phosphorus and total nickel per ASTM E350/E351/ E352. For ferrous substrate determine total iron per ASTM E277. Determine phosphorus content of base metal per ASTM E350/E351/E352. Calculate the %P in the plating based on the following:-
24、 P-P1*/Ni + (P-P1*) x 100 = % P in plating. ENGINEERING MATERIAL SPECIFICATION WSD-M1P65-B1/B2 Copyright 2012, Ford Global Technologies, LLC Page 4 of 4 where P = Total phosphorus stripped from component. P1* = Phosphorus contributed by base metal (substrate) Ni = Total nickel *For ferrous substrates this is based on iron stripped from sample and the phosphorus content of the substrate. Further suitable methods include Inductively Coupled Plasma (ICP), Directly Coupled Plasma (DCP) or other spectrographic techniques.
