1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16170 Thin Film; Nanometers Thick (NT) Pretreatment Generic Qualifications Copyright 2011 General Motors Company All Rights Reserved June 2011 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specificatio
2、n details the general material performance, compatibility, and processing information requirements for international corporate approval of nano ceramic conversion coatings. 1.1 Material Description. Materials qualified to this standard shall meet the performance shown in Appendix A, Table A1. Additi
3、onal testing and any exceptions to the requirements detailed herein are noted in the Appendix A. Suppliers must demonstrate the technology as being production capable to reduce undue risk prior to release in a production facility. Any material development issues, such as chemical or performance valu
4、es that fall outside of specified ranges, must be discussed with the appropriate material engineer for resolution. Material must successfully complete a production trial in a target facility prior to release for general use. 1.2 Symbols. Not applicable. 1.3 Typical Applications. This specification a
5、pplies to nano ceramic conversion coating materials that are intended for use on automotive vehicles. These coatings must provide a corrosion resistant, paint adhesion promoting surface to bare Cold Rolled Steel (CRS), Electrogalvanized coated steel (EG), Hot Dipped Galvanized coated steel (HDG), Ga
6、lvanneal/Zinc-Iron Alloy (Zn-Fe), and Aluminum (Al) substrates. 1.4 Remarks. In the event of any conflict between the English and domestic language regarding this document, the English language will take precedence. The Nanometers Thick (NT) process bath material is qualified to this standard. Howev
7、er, make-up and replenishment chemical are to be referenced to this document as well. All chemical materials used in this continuous pretreatment process must be provided by the same supplier. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 Extern
8、al Standards/Specifications. QS 1010ZZ ST 1405 SAE 1008 2.2 GM Standards/Specifications. GMW2 GMW14704 GMW8 GMW14829 GMW11 GMW14872 GMW3001 GMW14873 GMW3059 GMW15192 GMW8738 GMW15282 GMW14700 2.3 Additional References. Surface Coatings Process Control Relationships (SCPCR) Manual 3 Requirements 3.1
9、Requirements on Test Specimens. Not applicable. 3.1.1 Chemical Fingerprint. GM may conduct analyses of the materials supplied to this specification. Analyses may also be performed on representative panels. The analyses established for initial approval shall constitute a reference standard and shall
10、be part of the submission package. Information on the technologys ingredient formulation ranges and key manufacturing control characteristics must be provided as part of the submission package. If a product change is proposed that is outside the technology formulation limits, the responsible Global
11、Paint and Polymers Center (GPPC) Subject Matter Expert (SME) must be notified. All ingredient ranges, key manufacturing control limits, and certificate of analysis ranges must pass standard gage repeatability and reproducibility study. 3.1.1.1 Delivery Documentation. The supplier shall be responsibl
12、e for submitting a certificate of analysis with each batch of material arriving at a plant. 3.1.2 Physical Requirements. 3.1.2.1 Product Information. The responsible engineer for technical qualification shall be Copyright General Motors Company Provided by IHS under license with General Motors Compa
13、nyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16170 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 2 of 4 contacted prior to test initiation. A product data sheet, product composition and all relat
14、ed product processing information must be submitted for review at that time. 3.1.2.2 Mini-Submissions. Some approvals will require mini submissions when only minor changes are made to previously approved NT materials. Tests may be added or deleted according to the degree of material modification. Th
15、ese shall be determined prior to testing by agreement between the supplier and responsible GPPC SME. 3.1.2.3 Panel Preparation. The specific number and substrate combinations to be evaluated are shown in Table 1. A maximum profilometer roughness of 0.8 to 1.6 microns is allowed on the test substrate
16、s. Initial test panel roughness must be recorded prior to any coating applications. The decision regarding the required paint system of the panels, Electro-Deposition Primer (ELPO), and Topcoat, shall be agreed upon the responsible GPPC SME and the supplier prior to initial testing. 3.1.2.4 Test Sub
17、strates. Table 1 outlines the test substrates and durability requirements. Following are the requirements for the test panels: Thickness: 0.6 to 0.90 mm Materials Cold Rolled Steel (CRS) Electrogalvanized Steel (EG) Hot Dip Galvanized Steel (HDG) Galvanneal (Zinc-Iron Alloy, ZnFe), (GA) Aluminum (Al
18、) Table 1: Substrate Combinations Type Old New CRS SAE 1008 or ST 1405 GMW-2 EG QS 1010ZZ GMW11 HDG GMW-8 ZnFe GMW-8 Al AA5182 GMW15192M AL-S-5000-xxx Al AA6016 GMW15192M AL-S-6000 Other aluminum alloys such as AA5754, AA5083 and/or others may be requested for testing as needed. These alloys should
19、be included as part of the plant specific testing when appropriate. 3.1.2.5 Sample Size. The number of samples for each test shall be three, unless the responsible GPPC SME and the supplier agree on a different number for specific tests, prior to the start of testing. All substrates, pretreatments,
20、and coating layers shall be fully identified with source, product code, batch number, bake description and film build. 3.1.2.6 Conditioning. When testing over fully layered panels, the samples shall be subject to an aging period of at least 72 h at room temperature following the bake cycle. 3.1.2.7
21、Storage Requirements. The materials approved to this standard must be stable for 365 days, at + 5 to +35C. To validate this capability, test panels must be able to pass all initial test requirements after 365 days storage in the application facility (i.e., assembly plant). If there is any disagreeme
22、nt with these requirements, the supplier must contact the responsible GPPC SME. 3.1.2.8 Appearance. Upon visual inspection (without magnification), the NT coating on samples shall be smooth and uniform prior to the application of subsequent layers. 3.1.2.9 Nano Ceramic Coating Thickness/Coating Weig
23、ht. The NT coating weight or thickness is to be determined using an approved x-ray fluorescence (XRF) device. Certified calibration standards are required to verify accurate XRF operation prior to use. The coating thickness/weight generated is substrate dependent and must comply with the limits show
24、n in Table 2. Table 2: Coating Thickness/Weight Substrate Coating Thickness (nanometers) Coating Weight (mg/m2) CRS 20 to 85 20 to 100 EG 60 to 200 40 to 300 HDG 40 to 180 40 to 300 ZnFe 40 to 210 40 to 300 Al 10 to 120 10 to 50 3.2 Additional Requirements. 3.2.1 Road Test Options. Copyright General
25、 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 GMW16170 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 3 of 4 3.2.1.1 Testing can
26、be performed on laboratory panels only, test panels that are attached to the exterior of a vehicle on Road Schedule, or on full vehicles processed with the NT material being qualified. The decision regarding panel or full vehicle testing shall be agreed upon by the responsible GPPC SME, Corrosion En
27、gineering and the supplier prior to initial testing. Road testing can be performed at any GM global proving ground and simulate a minimum of five years of field exposure. Test years are to be achieved by running GMW8738 globally approved road schedules. If full durability vehicle testing is done, pe
28、rforation corrosion life estimates are to be made following the cosmetic corrosion cycle testing if a 10 year schedule is executed. 3.3 Performance Requirements. 3.3.1 Accelerated Corrosion Testing. Laboratory Tests must be performed to achieve a minimum equivalent of five years of cosmetic corrosio
29、n exposure. Creep is to be evaluated using GMW15282, maximum peak to maximum peak. laboratory testing to be performed per GMW14872. 3.3.2 Outdoor Exposure Testing. Prior to Outdoor exposure testing, Initial Tape Adhesion per GMW14829 must be performed. Outdoor exposure testing is per GMW14873. Resul
30、ts are to be evaluated after six months (visual only) and one year of exposure. Creep shall be measured and recorded per GMW15282. 3.3.2.1 After exposure, panels shall undergo deionized water immersion per GMW14704 for 48h at 63C. Tape Adhesion Test per GMW14829. Note: The responsible GPPC SME and s
31、upplier must agree upon the specific details of this requirement prior to the initiation of testing. 3.3.3 Chip Resistance. Chip resistance testing is to be performed using GMW14700. The results must meet the specified requirements shown in Appendix A, Table A1. 4 Manufacturing Process Not applicabl
32、e. 5 Rules and Regulations 5.1 All materials supplied to this standard must comply with the requirements of GMW3001, Rules and Regulations for Material Specifications. 5.2 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for P
33、arts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials File (i.e., GM Supply Power) under this standard number have been qualified by engineering as meeting the requirements of this standard. For other GM loca
34、tions, the responsible engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. Al Aluminum CRS Cold Rolled Steel EG Electrogalvanized Steel ELPO Electro-deposition Primer GA Galvan
35、neal GPPC Global Paint and Polymers HDG Hot Dip Galvanized Steel NT Nanometers Thick NTPT Nanometers Thick Pretreatment SCPCR Surface Coatings Process Control Relationships Manual SME Subject Matter Expert XRF X-ray Fluorescence ZnFe Galvanneal or Zinc-Iron-Alloy 8 Coding System This standard shall
36、be referenced in other documents, drawings, etc., as follows: Material per GMW16170 9 Release and Revisions This standard was originated in January 2009. It was first approved by Global Paint and Polymers Center in April 2011. It was first published in April 2011. Issue Publication Date Description
37、(Organization) 1 APR 2011 Initial publication. 2 JUN 2011 Corrected data in Table A1. (Global Paint and Polymers Center) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WOR
38、LDWIDE ENGINEERING STANDARDS GMW16170 Copyright 2011 General Motors Company All Rights Reserved June 2011 Page 4 of 4 Appendix A Table A1: Required Testing and Performance Note 1 Test Requirement Miscellaneous Items Initial Tape Adhesion GMW14829 Adhesion: 95% Note 2 Accelerated Corrosion: GMW14872
39、Exposure C CRS 6.0 mm maximum. EG, HDG, ZnFe and Al: 4.0 mm maximum Note 2, Note 3, Note 5 Outdoor Exposure:GMW14873 Adhesion GMW14829 after DI Water Immersion per GMW14704 Corrosion: CRS 6.0 mm maximum EG, HDG, ZnFe and Al: 3.0 mm maximum. Adhesion: 95% or GT 1 maximum Note 3 Chip Resistance: GMW14
40、700 Elpo Only Fully Layered 7 Rating Minimum 8 Rating Minimum Note 2, Note 4 Proving Grounds: GMW8738 CRS 6.0 mm maximum. EG, HDG, ZnFe and Al: 3.0 mm maximum If panels only: Note 2, Note 3 For all options: Note 5 Note 1: Three (3) equivalently layered phosphated control panels are to be run for eac
41、h designated test. Note 2: Test three NTPT and ELPO coated only panels using CRS, EG, HDG, ZnFe and Al substrates. Note 3: Test three fully layered panels using CRS, EG, HDG, Al and ZnFe (white only). Note 4: Test three fully layered panels using CRS, EG, HDG, Al and ZnFe x three colors (white, red and black). Note 5: Five (5) year field exposure equivalent minimum. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
