Vertragspartner erhalten die Norm nur über die zuständige Beschaffungsabteilung.
Confidential. All rights reserved. No part of this document may be transmitted or reproduced without the prior written permission of a Standards Department of the Volkswagen Group.
Parties to a contract can only obtain this standard via the responsible procurement department.
VOLKSWAGEN AG
N o r m  v o r  A n w e n d u n g  a u f  A k t u a l i t ät  p r üf e n  / C h e c k  s t a n d a r d  f o r  c u r r e n t  i s s u e  p r i o r  t o  u s a g e .
T h e  E n g l i s h  t r a n s l a t i o n  i s  b e l i e v e d  t o  b e  a c c u r a t e . I n  c a s e o f  d i s c r e p a n c i e s  t h e  G e r m a n  v e r s i o n  s h a l l  g o v e r n .
Q U E L L E : N O L I S
Page 2
TL 217: 2002-07
Table 2
Surface protection type no longer permitted
for new designs -
contains Cr(VI)
Replacement surface protection type prescribed for new designs -
Cr(VI)-free [Exception: TL 194 version 05.99 contains
Cr(VI)]
Ofl-c350 Ofl-c342 Ofl-c650 Ofl-c642 Ofl-c351 Ofl-c343 Ofl-c651 Ofl-c643 Ofl-c355 Ofl-c347 Ofl-c360 and Ofl-c660 Ofl-t630, olive-green according to TL 233
Ofl-c683 Ofl-c686 according to TL 194
(components in contact with Mg)
Ofl-c385 Ofl-c687 according to TL 194
(joining elements in contact with Mg)
Ofl-c685 Ofl-c687 according to TL 194
(joining elements in contact with Mg)
3.2 General
requirements
Approval of first supply and changes according to VW 011 55.
Avoidance of hazardous substances acc. to VW 911 01.
10 finished parts are required for complete testing.
Unless certain sections of parts that are marked in the drawing are excluded from the surface coating, the entire surface of the parts must comply with the required surface protection type and display the prescribed properties.
In the case of screws and quick fastening elements the test specifications listed below only apply to th
e head and/or the wrench bearing surfaces, in the case of nuts they apply only to the face surfaces and/or wrench bearing surfaces. For threaded parts and similar molded parts, such as studs, the test requirements only apply to the face surfaces.
The test requirements of the next protection class down apply to process-determined weak coating areas on joining elements such as shank and thread.
Furthermore, the specifications in DIN EN ISO 4042 concerning the maximum possible thickness of electroplated coating in the threaded profile shall be taken into consideration.
For parts made from hot-dip zinc-coated and additionally oiled semifinished products, the test requirements only apply to zinc coating thickness and to resistance in the SO2 test according to DIN 50 018- KFW 2.0S.
For sections of parts that are damaged due to the manufacturing method, such bend radii, the requirements of the next protection class down are applied.
The protective coatings must exhibit no pores, cracks, damage or other flaws that impair corrosion protection and/or specified appearance.
Further, the coatings shall exhibit firm adhesion to the base material and may not flake under slight deformation.
Page 3
TL 217: 2002-07 The layout and control of the production process shall not impair the functional characteristics of the finished part. In particular, it shall be ensured, through the appropriate selection and combination of pretreatment and heat treatment, that no hydrogen-induced brittle fractures occur. If, contrary to our specifications in VW 137 50, section 3.4, paragraph 1, electrolytically deposited zinc coatings for high-strength steel parts with R m > 1,000 N/mm² are used, these shall be zinc-coated in a cyanide or alkaline cyanide-free bath.
All heat treatments to avoid hydrogen-induced brittling must be performed as quickly as possible after depositing, however within 4 hours at least and before any further treatment of the coatings (see DIN EN ISO 4042).
3.3 Zinc coatings for paintwork
Electroplated zinc coatings on semifinished products, the surface treatment of which is not completed i
mmediately after the zinc coating process (e.g. dispatch from the zinc-coating plant to the painting plant) may not, according to Ofl-c310, display any passivation or phosphating.
Any required transport or storage protection of zinc coated parts, e.g. by oiling, shall be agreed upon with the painting plant.
Where painting is performed in a VW plant the transport or storage protection shall correspond to Quality Specification QP A001.editorially
In addition, the zinc coatings must display impeccable adhesive strength even at greater layer thicknesses, e.g. in the edge area.
3.4 Cr(VI)-free passivation treatment layers
In order to improve the corrosion resistance of electrolytically deposited zinc coatings to salt water and condensed water, a post-treatment in passivation solutions is technically standard.
If the passivation treatment solution does not contain any Cr(VI) compounds, the resultant conversion layers are likewise Cr(VI)-free.
Colorless and blue passivation treatments, so called thin film passivation treatments, with a layer thickness of approx. 0.1 µm are preferred for parts in the passenger and/or trunk compartment area, if a silver appearance is required. If required, they may also be sealed.
The corrosion protection is further improved using what is called thick layer passivation treatments (approx. 0.5 µm). As a result of their visual appearance (iridescent), they must also be sealed, so that they are suitable for use in the area that is visible to the customer.
3.5 Coatings with sealing
In the sealing process, organic and/or inorganic materials are applied to the previously formed conversion layers and partially included.
The additional sealing can increase the thickness of the layer structure by 0.5 to 2.0 µm.
This offers the following advantages over unsealed coatings:
─Increased corrosion resistance (delayed zinc and base metal corrosion with an unchanged zinc coating thickness)
─Change in the sliding properties (reduction of the friction coefficients and their variation ranges in joining elements)
─Color coding (the iridescence of the thick layer passivation treatments is significantly reduced, thus improving the appearance)
Page 4
TL 217: 2002-07
3.6 Structure
3.6.1 Base
material
Material according to the drawing.
3.6.2 Surface protection types/appearance
See table 1.
3.7 Layer
thickness
For coatings without post-treatment (surface protection types Ofl-c310 and Ofl-c610) the determination of the corrosion resistance according to DIN 50 018 KFW2.0S can be used as an indirect measure for the layer thickness of the zinc coating (see table 3).
Table 3
Surface protection type Test cycles Requirement
Ofl-c310, Ofl-c330    2 Ofl-c610, Ofl-c630    5 No base metal corrosion after the prescribed test duration
Alternatively, the layer thickness shall be determined as a test according to DIN 50 987, DIN EN ISO 1463, DIN EN ISO 2177, DIN EN ISO 2178 or DIN EN ISO 2360.
For requirements, see table 4.
Table 4
Protection type Components of a general
nature Welded parts, e.g. coarse
thread bolt
3 8 to 35 µm 8 to 1
4 µm
6 15 to 35 µm 15 to 23 µm
3.8 Adhesive
strength
Thermal shock test based on DIN EN ISO 2819.
The specimen part is aged for 30 minutes at (220 ± 10) °C and then dipped in water at a temperature of 15 °C to 25 °C.
Requirement: no large-scale or bubble-shaped stripping of the zinc coating.
3.9 Corrosion
behavior
The corrosion resistance of the systems must be ensured in the as-received condition and also after a 24-hour period of heat aging at 120 °C. These are minimum requirements and must always be adhered to.
Page 5
TL 217: 2002-07
3.9.1
Passivation treatment layers and sealing
Test according to DIN 50 021-SS, evaluation according to DIN 50 961, test durations and requirements according to table 5.
Table 5
Test duration in h Surface protection type
Barrel coated
parts
Rack-galvanized goods
Requirement
Ofl-c340, Ofl-c640    6 12 Ofl-c341, Ofl-c641
48
72
Ofl-c342, Ofl-c642, Ofl-c345, Ofl-c647
72 96 Ofl-c343, Ofl-c643 96
168
No zinc corrosion after the
prescribed test duration  3.9.2
Zinc coatings including passivation treatment layers and sealing
Test according to DIN 50 021- SS, test durations and requirements according to table 6.
Table 6
Surface protection type Test duration in h
Requirement
Ofl-c310, Ofl-c330
48 Ofl-c340, Ofl-c610, Ofl-c630 96 Ofl-c341 144 Ofl-c342, Ofl-c347, Ofl-c640 168 Ofl-c343, Ofl-c641, Ofl-c642,
Ofl-c647 240
Ofl-c643 360
No base metal corrosion after the prescribed test duration and
no zinc corrosion after the test durations specified in table 5.
4 Referenced standards 1 QP A001 Prelubes; Slushing Oils (general); Blank Washing Oils, Drawing Oils and
Drawing Agents; Quality Requirements
VW 011 55 Vehicle Supply Parts – General; Approval of First Supply and Changes
VW 137 50 Surface Protection of Metal Parts; Surface Protection Types, Codes, Requirements
VW 911 01 Environmental Standard for Vehicles, Vehicle Parts, Materials, Fuels; Avoidance of Hazardous Substances
DIN 50,018
Testing in a Saturated Atmosphere in the Presence of Sulfur Dioxide
1
In this section terminological inconsistencies may occur as the original titles are used.

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。