1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW15622 Surface Coating and Functional Performance for Wiper Arms, Blades, and Modules Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 1 of 7 1 Scope 1.1 Material Description. This specification defines the paint sys
2、tem durability, appearance and corrosion requirements for metal/coated front and rear wiper arms and blades. It also defines functional evaluation and requirements for wiper arm pivots and wiper system modules. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Wiper washer arms, blades, and mod
3、ules. 1.4 Remarks. All materials pertaining to meeting this standard shall be specified on the part drawing and/or in the math data file based on GM engineering standards. 1.4.1 Plastic Parts. All exterior plastic parts must comply with GMW14650. 1.4.2 Paint on Plastics. All exterior painted plastic
4、 parts must comply with GMW14797. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ISO 2813 ISO 4892-2 SAE J1545 ISO 4892-1 ISO 7724-1 SAE J2527 2.2 GM Standards/Specifications. 9985670 GMW3221 GMW14701 GMW14873 B
5、 040 1370 GMW3286 GMW14729 GMW15282 GMW3005 GMW14124 GMW14797 GMW15357 GMW3008 GMW14650 GMW14829 GMW15545 GMW3011 GMW14665 GMW14865 GMW3059 GMW14700 GMW14872 2.3 Additional References. TMC003 Material Safety Data Sheet guidance documents (available at ). Wiper Subsystem Technical Specification (SSTS
6、). 3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.1.1 All substrates and coatings, including adhesion promoters, shall be Chrome VI free. 3.1.2 Sample Conditioning. All samples are to be conditioned prior to each requirement test to GMW3221, Code A. 3.1.3 Panel or Part Prepa
7、ration. Prior to start of panel or part preparation, contact the responsible GM engineer to ensure proper selection and agreement of substrates, pre-treatment, electrodeposition, primer, and/or primer surfacer materials. Unless otherwise specified, all coating layers will be applied at minimum dry f
8、ilm thickness (DFT) and cured at target bakes. 3.2 Paint Durability and Appearance Requirements for Coated Arms and Blades. Topcoat materials qualified to this standard must meet specific performance requirements as listed in this standard. Paint Copyright General Motors Company Provided by IHS unde
9、r license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15622 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 2 of 7 performance for this standard is taken from and refere
10、nced in GMW3005, Type B, Class 2. Only the sections specifically called out herein are required. The topcoat may also be a low-gloss monocoat system. No hand polishing will be used for low-gloss, 60 gloss systems. Unless otherwise specified, a minimum of six (6) wiper arms and blades are to be teste
11、d per design. At the discretion of GM Engineering, plaques or surrogate parts may be tested/weathered instead of the actual production parts. If allowed, processed plaques or surrogate parts must emulate the processing of the intended production parts. 3.2.1 Dry Film Thickness. 3.2.1.1 Pre-treatment
12、/E-Coat. Pre-treatments, E-Coat, or anodized material specifications and minimum dry film builds shall be called out separately on the GM part drawing. 3.2.1.2 Topcoat. The minimum topcoat dry film build for all surfaces of parts shall meet the minimum DFT as specified in the approved GM specificati
13、on or by the appropriate GM Engineering group. The minimum DFT shall be called out on the GM part drawing. 3.2.2 Test/Part Substrates. All test/part substrates must be phosphated per a GMW3011 approved phosphate system and E-Coated with an approved GMW3008 electrodeposition primer or anodized per GM
14、W14665 Functional Exterior Transparent unsealed (FETu) prior to topcoat/monocoat application. 3.2.3 Ultraviolet/Visible Transmission through Cured Paint Film (GMW15545). Panels must be prepared per the conditions at minimum topcoat/monocoat film build and a high bake condition to be determined at th
15、e time of test and agreed to by GM Engineering. The target/nominal bake will be used to establish the high bake condition. Report data as specified in GMW15545 for topcoats or monocoats at each bake condition. Requirements are as specified: a. 0.1 transmission from 290 nm to 360 nm, and b. 0.5 trans
16、mission at 400 nm. Refer to GMW3005 for further definition. 3.2.4 Tape Adhesion Test for Paint Finishes (GMW14829). Adhesion testing shall be conducted in a minimum of three (3) separate areas. Evaluate the results using the Crosshatch Classification/Rating Scale. A maximum rating of 1 is required a
17、fter the following environments: 3.2.4.1 Initial. 3.2.4.2 High Humidity Test (GMW14729, Options A or B). Parts and plaques will be used as required and agreed to by GM Engineering. Expose test samples for 240 h. Adhesion shall be conducted in three (3) separate areas on the panel or part. In additio
18、n to tape adhesion, there shall be no blistering or discoloration. 3.2.4.3 Automotive Environmental Cycles (GMW14124, Cycle A). Parts and plaques will be used as required and agreed to by GM Engineering. Unless otherwise stated, run 15 cycles, Cycle A. Adhesion (GMW14829) must be run after humidity
19、every five (5) cycles. No cracking or adhesion loss required when tested per GMW14829. 3.2.4.4 Accelerated Weathering (SAE J2527 or ISO 4892-1, ISO 4892-2). Testing must be completed using a control retain. Exposure to SAE J2527 or ISO 4892-1 and ISO 4892-2 must be followed by 96 h humidity per GMW1
20、4729, Options A or B, prior to tape adhesion. Painted test panels or parts may be used for exposure at the discretion and approval of GM Engineering. Evaluate test samples at mid- and full-cycle exposure. No cracking or adhesion loss is allowed with minimum 70% gloss retention. 3.2.4.4.1 SAE J2527.
21、3500 kJ/m2 exposure required. Note: Wiper blades with non-replaceable elements using this protocol shall meet all requirements herein with exception of accelerated weathering exposure to 1264 kJ/m. 3.2.4.4.2 ISO 4892-1, ISO 4892-2. 3000 kJ/m2 exposure required. Use parameters as follows: 3.2.4.4.2.1
22、 Inner and outer filter: Borosilicate. 3.2.4.4.2.2 Radiant exposure: 0.50 W/m at 340 nm. 3.2.4.4.2.3 Test program Cam No. 7: (102 0.5) minutes light only (18 0.5) minutes light and spray 3.2.4.4.2.4 Black-standard temperature: (+80 3) C. Copyright General Motors Company Provided by IHS under license
23、 with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15622 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 3 of 7 Note: Wiper blades with non-replaceable elements using this pro
24、tocol shall meet all requirements herein with the exception of accelerated weathering exposure to 1500 kJ/m. 3.2.4.4.3 Gloss. Measure initial and exposed gloss per ISO 2813. Report test methods, measurement angles and test equipment used. Wash weathered specimens prior to making measurements and obs
25、ervations. Wash with scrubbing action, using a clean sponge or low-lint paint shop quality rag saturated with deionized water at (23 3) C for no more than 1 minute. Seventy percent (70%) retention is required after exposure and wash. 3.2.4.4.4 Color. Inspect mid- and full-exposed test samples for gl
26、oss or color change. Wash weathered specimens prior to making measurements and observations. Wash with scrubbing action, using a sponge that is saturated with deionized water at (23 3) C. Exposed parts shall not exhibit any indications of blistering or other factors that might affect the function or
27、 appearance of the part. The color change shall not exceed three (3) units (E of 3.0). The color change shall be measured per ISO 7724-1 or SAE J1545 (CIELAB color space, 10 observer, metering orifice 10 mm, illuminant D65, specular component included). Note: Visual color change that is considered o
28、bjectionable shall override the E measurement. Part must not exhibit objectionable color change. 3.2.4.5 Natural, Outdoor Weathering of Automotive Exterior Materials for 3, 6, 12 and 24 Months (GMW14873, Procedure 1). Technologies must have a minimum of 24 months exposure on the exact coating system
29、 to be considered for approval to this requirement. Natural weathering exposure performance takes precedence over accelerated weathering tests. Painted test panels or parts may be used for outdoor weathering exposure at the discretion and approval of GM Engineering. A minimum of two (2) panels/parts
30、, one (1) for appearance and one (1) for adhesion testing, shall be sent out for each of the exposure durations. Exposed test samples must meet the adhesion, color and gloss requirements as called out in 3.2.4.4.3. 3.2.4.6 Stone Impact Resistance of Coatings (GMW14700). Run either Method A or Method
31、 B for low-temperature resistance and Method C, room temperature, of stone impact resistance per GMW14700. A minimum rating of 8 is required. 3.2.4.7 Determination of Scratch Resistance of Organic Coatings - Simulation of Car Wash Installations (GMW14865). Compare to a control material; there should
32、 be no objectionable change. 3.2.4.8 Resistance of Coatings to Chemical Etching and Distortion (GMW14701). A rating of 8 or greater is required. Exclude motor oil, brake fluid, polyalkylene glycol oil and engine coolant from this requirement. 3.2.4.8.1 Washer Fluid Resistance. Substitute the followi
33、ng listed solutions for washer fluid resistance in GMW14701. All ratios are in volume/volume (V/V) concentrations. a. 40% Methanol with 60% water per 9985670. b. 30% Isopropanol (IPA) with 70% deionized water per B 040 1370. c. 40% Ethanol with 60% water. Note: Use plant-specific materials in additi
34、on to the materials called out in GMW14701 if there is a target plant. 3.3 Corrosion Requirements. 3.3.1 Cosmetic Corrosion. 3.3.1.1 Coated Arms and Blades. 3.3.1.1.1 Cyclic Corrosion Test (GMW14872, EXT, Method 1/2, Exposure C). A minimum of three (3) wiper arms and blades per design are to be subj
35、ected in in-vehicle position. Unless otherwise specified, scribe test samples in a minimum of two (2) locations per GMW15282. Determine total scribe creepback per GMW15282, Option A or Option B. Creepback shall not exceed 3 mm total for all substrates. Additionally, in other than scribed areas, the
36、part(s) must demonstrate a minimum cosmetic corrosion rating of 9 per GMW15357. 3.3.1.1.2 Salt Spray Fog Test (GMW3286). Salt spray fog testing for painted metal arms and blades shall be conducted for 336 h according to GMW3286. No corrosion (except along scribe lines), blisters or any change of sur
37、face is allowed. Unless otherwise specified, scribe test samples in a minimum of two (2) locations per GMW15282. Determine total scribe creepback per GMW15282, Option A or Option B. Creepback shall not exceed 3 mm total for all substrates. Note: Zinc and zinc alloy pre-coated substrates shall be tes
38、ted without scribe lines. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15622 Copyright 2013 General Motors Company All Rights Reserved
39、 August 2013 Page 4 of 7 3.3.1.2 Wiper Module. 3.3.1.2.1 Cyclic Corrosion Test (GMW14872, SS, O/WS, Method 1/2, Exposure C). The exposed component must meet a red rusting rating of 7 or better per GMW15357. A minimum of three (3) wiper modules are to be subjected in in-vehicle position. 3.3.2 Functi
40、onal Corrosion. 3.3.2.1 Coated Wiper Arms and Blades (GMW14872, EXT, Method 1/2, Deviation Option 1, Exposure E). A minimum of three (3) wiper arms and blades per design are to be subjected in in-vehicle position. The wiper arm head to retainer joint is to be actuated up/down one (1) time every ten
41、(10) test cycles and the arm load recorded. After actuation, rotation through the entire service up angle must be free without restrictions. At the end of the test, the arm load must be within drawing specification and the joint must have free rotation. Wiper blades shall provide a wipe quality rati
42、ng of 7 or better after exposure. Components must comply with all other Wiper SSTS requirements. Note: Replaceable wiper blades that are excluded from functional corrosion. 3.3.2.2 Wiper Module (GMW14872, SS, O/WS, Method 1/2, Deviation Option 1, Exposure E). A minimum of three (3) wiper modules are
43、 to be subjected in in-vehicle position. Prior to the start of the test, operate the module on high speed for 8 h to pre-condition the module. During the test, operate the module on low speed every ten (10) cycles for 5 minutes and record the electrical current draw. At the end of the test, install
44、the module in a vehicle buck to verify the system meets wipe speed, current draw, and all other functional Wiper SSTS requirements. The wiper motor is to be disassembled after the system functional check to verify that no water intrusion has occurred. 3.3.2.3 Rear Wiper Motor/Module (GMW14872, SS, I
45、/WS, Method 1/2, Deviation Option 1, Exposure E). A minimum of three (3) rear wiper motor/modules are to be subjected in vehicle position. Plastic is to be placed over the motor/module but the output shaft and housing are to be exposed to the testing environment. Prior to the start of the test, oper
46、ate the motor for 8 h to pre-condition the module. During the test, operate the motor every ten (10) cycles for 5 minutes and record the electrical current draw. At the end of the test, install the motor/module in a vehicle buck to verify that the system meets wipe rate, current draw, and all other
47、functional Wiper Subsystem Technical Specification (SSTS) requirements. The wiper motor is to be disassembled after the system functional check to verify that no water intrusion has occurred. 3.4 Continuous Conformance. 3.4.1 Daily. Dry film thickness data points are to be recorded on a minimum of t
48、hree (3) samples per shift. The minimum DFT, as specified on the engineering drawing, must be met at all locations with all measurable coatings as referenced in 3.2.1. Refer to Figure 1 and Figure 2 for DFT locations. Figure 1: Wiper Arm DFT Locations Copyright General Motors Company Provided by IHS
49、 under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15622 Copyright 2013 General Motors Company All Rights Reserved August 2013 Page 5 of 7 Figure 2: Wiper Blade DFT Locations 3.4.2 Monthly. Test three (3) samples of each design per Tape Adhesion Test, GMW14829, for Paint Finishes initially and post-high
