TL52451_EN_2008-08-01
Painting of Metallic Decorative Add-on Parts for the Exterior Requirements
Previous issues
TL 52451: 1996-06, 1998-07, 2003-05Changes
The following changes have been made as compared to TL 52451: 2003-05:–Table 2, No. 3 "Salt spray test" removed
–Table 2, No. 3.2 "Condensed water test", requirement expanded –Table 2, No. 8.1 "Scratch resistance", requirement changed –Standard restructured
–Referenced documents updated –Table in Section A.1 expanded Scope
This standard applies to paintwork on exterior add-on parts with metallic substrate that are in the visible area and thus must fulfill predominantly decorative and functional requirements, e.g., roof rails,wiper arms, pillar trim.Description
Paintwork according to TL 52451, with additional specification of the surface protection according to Volkswagen Standard VW 13750, if required.Example 1:Paintwork acc. to TL 52451
Structure according to Ofl-x630 (cathodic electrocoat) + powder top coat Example 2:
Paintwork acc. to TL 52451
Structure according to Ofl-x632 (cathodic electrocoat) + powder top coat
1
2
Group Standard
TL 52451
Issue 2008-08
Class. No.:50242
Descriptors:
paint, paintwork, surface protection, multicoat paint, metal part, decorative, top coat, wiper arm, roof rails,pillar trim
Check standard for current issue prior to usage.
This electronically generated standard is authentic and valid without signature.
The English translation is believed to be accurate. In case of discrepancies the German version shall govern.Numerical notation acc. to ISO practice.
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Technical responsibility Standards department GQL-LP/2Marina Engelking Tel.: +49-5361-9-41793GQL-LM/2Dr. Olaf Claus Tel.: +49-5361-9-194081
GQL-L
Dr. Stephan Eisenberg
EKTC/4 Jürgen Wiesner EKTC
Tel.: +49-5361-9-29064
Manfred Terlinden
Confidential. All rights reserved. No part of this document may be transmitted or reproduced without prior permission of a Standards Department of the Volkswagen Group.Parties to a contract can only obtain this standard via the B2B supplier platform "https://www.wendangku.net/doc/0b9599486.html,".
? VOLKSWAGEN AG
VWNORM-2007-10f
Requirements General requirements
Approval of first supply and changes according to VW 01155.Avoidance of hazardous substances according to VW 91101.A minimum of 10 finished parts are required for complete testing.
The supplier must enclose the information according to Section A.1 and the first-sample or develop‐ment-sample test report with all parts to be tested.
All areas on the part for which the following requirements do not apply must be marked in the drawing.Deviating requirements must be specified.
The coating must not be damaged during professional installation.Appearance
The parts must exhibit a uniform appearance over their entire surface and conform to the drawing requirements, the color standard, as well as the visual properties according to Table 2. Pores, cracks,and other flaws that adversely affect the specified appearance are not permissible. Deviations from this must be specified in the drawing.
Degree of glossiness, color, and structure are to be documented in the first-sample or development-sample test report.Open-Air Weathering
All painted components are tested according to VW 50185 (2 years in humid heat and 2 years in dry heat). The supplier is obligated to remove the cause for complaints occurring during this test and to improve the paint system.Paint process
The paint process must be coordinated between the paint shop and paint manufacturer. Both parties confirm the first-sample test report, meaning that both are responsible for fulfilling the specified re‐quirements. Responsibilities are broken down as follows:–The paint manufacturer provides information on the fulfillment of requirements in the Technical Supply Specification, processing guidelines, and support regarding the applied paint method.–
The paint shop provides information on the substrate and pretreatment steps, checks the re‐quirements at the earliest possible juncture, confirms compliance with the paint manufacturer’s processing guidelines, and requests support regarding the applied paint method.
The blank manufacturer must provide information regarding the base material (substrate, pretreat‐ment, paint coats already applied) and ensure its suitability for further paintwork.Paint structure/coat thicknesses
The coat thicknesses specified in Table 1 (measurement according to DIN EN ISO 1463) only apply if additional coats are used for the requirement according to VW 13750 or if there is no reference to a surface according to VW 13750. The specified coat materials must be adhered to in any event.The total paint coat thickness must not exceed 110 μm in a pure liquid paint structure.
In a structure containing powder paint, a total paint coat thickness of 150 μm must not be exceeded.
3 3.1
3.2
3.3
3.4
3.5
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TL 52451: 2008-08
Repainting is only possible if the same color is used. The total paint coat thickness in the event of repainting is limited to a maximum of 160 μm for the pure liquid paint structure and 200 μm for the powder paint structure. The requirements of TL 52451 must also be fulfilled by means of a reliable process during repainting.
The paint structure must consist of either:
A primer coat (1) and a single-layer top coat (2) according to Table 1
Or
A primer coat (1) and a dual-layer top coat (3) according to Table 1
In exceptional cases (e.g., powder top coat on pretreated aluminum substrates), a top coat structure only (according to Table 1 (1) or (2)) can also be chosen; however, this must be expressly stipulated in the drawing.
Table 1 – Paint coat thicknesses
Coat Coat material Standard
value
Coat thick‐
ness
(μm)
1.Primer coat a Cathodic electrocoat17 to 22
b Heavy coat cathodi
c dip paint25 to 35
c Liqui
d paint filler (binder bas
e as desired)25 to 35
d Powder filler (binder based on epoxy resin or
polyester resin)
50 to 80
2.1-layer top coat a Powder top coat (polyester resin or acrylate resin
base for matte paints, acrylate resin base for high-
gloss paints)
50 to 100
b Top coat (liquid paint, binder base: polyester, poly‐
acrylate, polyurethane)
20 to 40
3.2-layer top
coat
Color‐
ing
coat
a
Base coat (liquid paint, binder: CAB, acrylate,
melamine, polyester systems)10 to 20
Clear
coat
b Clear coat (liquid paint, binder: acrylate, polyester)30 to 50
c Powder clear coat (acrylate resin-base
d binder; with
use of powders with a polyester resin base, additional
protection in the form of a further liquid clear coat
layer is required)
50 to 100
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TL 52451: 2008-08
Technological requirements
See Table 2.
The parts must be one week old for the technological tests, or they must be aged before the tests for 24 h at +60 °C. Aging and conditioning: 24 h in the DIN 50014 – 23/50-2 standard climate. Deviations from this must be noted in the test report.
Table 2
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a) Top coats with a reflectometer value of ≥ 70 at 60° according to DIN EN ISO 2813 are defined as high-gloss paints.
b) With crosscut test characteristic values > 1, the result should be verified through further adhesion tests (e.g., stone impact test).c) Tesa 4657 must be used as the adhesive tape.
d) Deviating from this, wiper arms are evaluated according to TL 934.
e) Impact test according to DIN ISO 4532, however, with a specified testing force of 90 N on a rigid base plate.
f) A section of the part is coated by immersing in sealant wax (released and used in standard production). After aging the part for 24 h at
room temperature, the wax coat is washed off by agitating the part in hot (+80 °C) kerosene for 3 min.
g) High-gloss coatings must be cleaned before the evaluation with paint cleaning agent; matte coatings must be cleaned using an aqueous solution containing tensides.
h) Reference clear coat ALD 069 050, made by BASF; reference sheets are available from P1O/D.
Referenced documents
The following documents cited in this standard are necessary for application.
In this Section terminological inconsistencies may occur as the original titles are used.PV 1210Body and Add-on Parts; Corrosion Test
PV 1502Clear Coat for Dual-Layer Metallic Paint Coatings; Testing for Resistance to Cracking
PV 1503Paint Coating of Metallic and Non-Metallic Materials; Pressure Washer Test
PV 2005Vehicle Parts; Testing of Resistance to Environmental Cycle Test PV 3.10.3Paints and varnishes; Test of resistance to caustic solutions
PV 3.10.5Paints and Varnishes; Testing of Resistance to Industrial Grade Dust Re‐movers
PV 3.16.4Paints and Varnishes; Testing of Acid Resistance
PV 3.3.3Paints and Varnishes; Testing the Scratch Resistance of Clear Coats PV 3929Non-Metallic Materials; Weather Aging in Dry, Hot Climate PV 3930Non-Metallic Materials; Weathering in Moist, Hot Climate QP R015Self-Adhesive Film; Quality Requirements
TL 52146Central Hydraulic System Fluid; Lubricant Requirements
TL 52162Factory-Fill-for-Life Automatic Transmission Fluid; Lubricant Require‐ments
TL 52173Factory-Fill Engine Oil SAE 0W-30 with Fuel-Saving Properties for Ex‐tended Oil Change Intervals; Requirements, Testing TL 766
Brake Fluid; Material Requirements
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TL 52451: 2008-08
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TL 774Ethylene Glycol-Based Coolant Additive; Material Requirements
TL 788Diesel Fuel; Fuel Requirements
TL 934Windshield Wiper System; Function and Material Requirements
VW 01155Vehicle Supply Parts; Approval of First Supply and Changes
VW 13750Surface Protection of Metal Parts; Surface Protection Types, Codes
VW 50185Vehicle Components; Resistance to Open Air Weathering
VW 50195Colorimetric Evaluation of Automobile Paint Coatings
VW 91101Environmental Standard for Vehicles; Vehicle Parts, Materials, Operating
Fluids; Avoidance of Hazardous Substances
DIN 50014–
DIN EN 14214Automotive fuels - Fatty acid methyl esters (FAME) for diesel engines -
Requirements and test methods
DIN EN 228Automotive fuels - Unleaded petrol - Requirements and test methods DIN EN ISO 1463Metallic and oxide coatings - Measurement of coating thickness - Micro‐
scopical method
DIN EN ISO 20567-1Paints and varnishes - Determination of stone-chip resistance of coatings
- Part 1: Multi-impact testing
DIN EN ISO 2409Paints and varnishes - Cross-cut test
DIN EN ISO 2812-3Paints and varnishes - Determination of resistance to liquids - Part 3:
Method using an absorbent medium
DIN EN ISO 2812-4Paints and varnishes - Determination of resistance to liquids - Part 4:
Spotting methods
DIN EN ISO 2813Paints and varnishes - Determination of specular gloss of non-metallic
paint films at 20°, 60° und 85°
DIN EN ISO 4628-1Paints and varnishes - Evaluation of degradation of coatings - Designation
of quantity and size of defects, and of intensity of uniform changes in ap‐
pearance - Part 1: General introduction and designation system
DIN EN ISO 4628-8Paints and varnishes - Evaluation of degradation of coatings - Designation
of quantity and size of defects, and of intensity of uniform changes in ap‐
pearance - Part 8: Assessment of degree of delamination and corrosion
around a scribe
DIN EN ISO 6270-2Paints and varnishes - Determination of resistance to humidity - Part 2:
Procedure for exposing test specimens in condensation-water atmo‐
spheres
DIN EN ISO 9227Corrosion tests in artificial atmospheres - Salt spray tests
DIN ISO 4532Vitreous and porcelain enamels - Determination of the resistance of enam‐
elled articles to impact - Pistol test
VDA 621-403Anstrichtechnische Prüfungen; Prüfung der Wetterbest?ndigkeit im
Naturversuch (Freibewitterung) (only available in German)
Supplier information for the test part
1.Part designations and numbers
2.Blank manufacturer
3.Base material (manufacturer, manufacturer designation and VDA (German Association of the Automotive Industry) designation)
4.Cleaning and pretreatment methods
5.Painter, painting location, painting system
6.
Painting date
Paint structure and painting procedure for all coats. See Table A.1 for sample details for a primer coat.
Table A.1
Primer coat Paint manufacturer
Dupont
Manufacturer’s designation, possibly product da‐ta sheet
R 50149.6 (not batch number!!)Water/solvent; single-component/dual-compo‐nent, powder Solvent; single-component Binder base Epoxide
For dual-component paint systems, specifica‐tions for hardener - Manufacturer
BASF - Manufacturer’s designation, possibly product data sheet K 350- Chemical basis
HDI - Ratio of base paint to hardener 7 + 1
Baking temperature +80 °C Baking duration
20 min Desired coating thickness 25 μm
Application method
Pneumatic, manual
Appendix A (informative) A.1 Page 9
TL 52451: 2008-08