《GMNA-9984136-1993.pdf》由会员分享，可在线阅读，更多相关《GMNA-9984136-1993.pdf（2页珍藏版）》请在三一文库上搜索。
1、- 9OOb3 77 0004537 256 W I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Palnt I STEEL WHEELS - SURFACE COATINGS APPLICATION AND PERFORMANCE REQUIREMENTS 9964136 1 SCOPE. This specification defines the pretreatment, paint materials and processing requirements to paint steel wheels
2、 for passenger cars and trucks. Paint durability mquire- ments are also inchlded. 1.1 AI PLICATIONS. Wheels that are to be fully topcoat painted can be primed with epoxy EI.PG. All other wheels should bc primed with acrylic EIPO unless epoxy EI.PG is sped% on the engineering drawing. 2 REFERENCED ST
3、ANDARDS. GM435OM GM9511P GM9102P ASTM 1186 3 REQUIREMENTS. Spific mat&al requirements and appropriate test methods are listed under proper&s. 3.1 PRETREATMENT REQUIREMENTS. Clean and zinc phosphate with approved products as shown in the GM Coxporate Materkk File for spray and/or *r&n processes. Proc
4、essing pammeters should conform to those tecommended by the chemical suppliers. DI water rinses must be properly . . maumnedinordertomattheperforman a requilements of thisspecification.Ahemate proasses must receive enginecling - approvaL NOTE: On-line ttcamxnts usingmotethanonechemicalsup- plkiUC un
5、acceptable. 3.2 PAINT PEOCESS REQUIREMENTS. The cathodic acrylic ELPO and the cathodic epoxy EIPG paint tank solu- tions shall be maintained to continuously meet the processing req-. 3.3 PAINTED PBODUCI REQUIREMENTS. These test reqpiremnts are idended for routine acceptance and control of production
6、 painted patts using materials and processes pt+ viously found to be satisfactory. These test requirements do not necessarily represent the complete testing necessary for e-g approval. 3.3.1 For wheels with only prir& surt%ces, i.e. no topcoat, the following mpinments should be met: 3.3.1.1 Aqlic EL
7、PO dry film thickness to be 17.8 to 30.5 EpoxyELpodryfihncsstobe127to22.9 (ASTM 1186, Method B). 3.3.1.2 Painted part durability to meet the performance requiFtmtnts of GM435OM. in class A-336. 3.3.1.3 Wheels painted with the acrylic ELPO. must show minimal gloss and color change or any other delete
8、rious dects when subjected to one year of Florida exposure at 5 &om horixontal, faciug south (qua&ation only). 3.3.1.4 After scab corrosion testing per GM951lP . them shall be no mom thau 3 mm creepback or loss of adhesion &om either side of the scribed line to the paint after exposure to scab and a
9、ir blow off per GM9102P. 3.3.1.5 Appcamncc. The visual appearance of the ELI 0 may be an indication of its durability performance. The coat- ing shall present a smooth, uniform, continuous appearance. No blistets, run outs, rinsing residues or other surface defects axe pemhed. The gloss level for th
10、e acrylic ELPO shall be 70 f 10 on a 60 degree gloss meter. The gloss level for the epoxy ELPOshaUbc35to55ona60 glossmeter(10maxona2O gloss meter). Finished part appearance must compare favor- ably with approved engim&ng standards. 3.4 For wheels with only one topcoat over the ELPG primer, the follo
11、wing requirements should be metz 3.4.1 Topcoat dry film thickness to bc 20 to 38 p 3.4.2 Painted part durability to meet the performance requite- mats of GM435OM, in class A-336. 3.4.3 Painted parts must show minimal gloss and color change or any other deleterious effects when subjected to one yea o
12、f Florida exposure at 5 from horizontal, facing south (quali6cation only). 3.4.4 After scab corrosion testing per GM9511P, then shall be no more than 3 mm creepback or loss of adhesion from either side of the scribed line to the paint a&r cxposum to scab and air blow off per GM9102I (qualification o
13、nly). 3.4.5 Appearance of topcoat paints must compare favorably with approved engineering standards. The visual appearance of the topcoat may be an indication of its durability performan. The coating shall present a smooth, uniform, continuous appeamna. No blisters, run outs, rinsing residues or otb
14、tr sur- face defects are rmitted. Topcoat paints should be applied onlyintheamasspccificdontheengineeringdrawings. 3.5 For wheels with more than one topcoat over the ELPG primer, the following requirements should be met: 35.1 Total dry f?hu thickness of the combined topcoats to be 38 to 63 w 35.2 Pa
15、inted part durability to meet the perfonnaua rqairc- ments of GM435OM. in class A-336. The minimum gravelomcter rating on wheels that have the acrylic primer shallbea4. 3.5.3 Painted parts must show minimal gloss and color change or any other deleterious effects when subjected to one year of Florida
16、 exposure at 5 from horizontal, facing south (qualification only). 35.4 After scab corrosion testing per GM951lP. them shall be no more than 3 mm creepback or loss of adhesion from dthcrsideofthebedlinttothepaintafferexposartto scab and air blow off per GM9102P APRIL 1993 PAGE 1 9964136 Copyright Ge
17、neral Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 21:05:43 MDTNo reproduction or networking permitted without license from IHS -,-,- m wob377 0004538 v72 m I GENERAL MOTORS ENGINEERING STANDARDS I Materials
18、and Proceeses - Paint I STEEL WHEELS - SURFACE COATINGS APPLICATION AND PERFORMANCE REQUIREMENTS 9964136 3.5.5 Appcarana of topcoat paint must compare favorably with approved engkering standards.Thevisuaiappcarana of the topcoat may be an indication of its durability perfotmana. The coating shall pr
19、esent a smooth, uniform, continuous appearance. No blisters, run outs, rinsing residues or other sur- fact defects are permitted. Topcoat paints should be applied only in the ateas specikd on the engmeering drawings. 4 INlTlAL SOURCE APPROVAL No shipment shalI bc made by any supplier until represent
20、ative initial production samples have been approved by engineer as meeting the lequimments of this specification. 4.1 Completed copies of the GM Makrial Safety Data Sheet and Cxitical Mate&l Register (available kom the engineering department or laboratory) must be submitted with any new submissions
21、or where a conqrosition change has occurmd 6 SOURCE SHIPMENT RESPONSlBILlN. Itwillbetbereofthesutoiasurethatthe material is not exposed to tempcratums during shipment which would cause the mate&d to fail to meet any of the require- lrmlts of this specification. 8 INSPECTlON AND REJECTION. All shipme
22、nts of makrial or parts under contract or pumhase order manufac- tured to this speciEcation shah bc quivalent in every respect to the initial samples approved by engkering. There shall be no changes in either fommlation or manufacturing processes permitted without prior notifkation and approval by e
23、ngineer- ing. Lack of notification by the supplier constitutes grounds for rejection of any shipment. While samples may be taken hm incoming shipments and checked for conformana to this spedcation, the supplier shall accept the responsibility for incoming shipments mating this specification without
24、depen- dence upon pumhaser s inspeUion. 7 #PROVED SOURCES. Engineering qualification of an approved source is mquired for this specification. only sourceslistedintheGMMaWalPileunderthis+cikation number have been qualifiid by engineering as meeting the lqadments of this specification. 8 GENERAL INFOR
25、MATION. This is a newly issued specification or&mated by the Automotive Paint Committee in Match 1988. 9964136 PAGE 2 APRIL 1993 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 21:05:43 MDTNo reproduction or networking permitted without license from IHS -,-,-