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© VOLKSWAGEN AG
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 .
N u m e r i c a l  n o t a t i o n  a c c o r d i n g  t o  I S O  p r a c t i c e  (s e e  V W  01000).
Q U E L L E : N O L I S
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3.1.2 Technical/functional applications
See Table 2. These coatings are primarily used for corrosion and/or wear protection for exterior and interior components. The surfaces of the anodized parts shall exhibit a uniform visual appear-ance.
Table 2
Protection
type
Ofl-w180 Ofl-w680 Ofl-w690 Ofl-w695
Method transparent anodized hard anodized hard anodized
impregnated
Application features/ example Surface protection coat-
ing with low corrosion
protection requirements
(e.g. ABS valve block)
Surface protection coat-
ing with moderate cor-
rosion protection re-
quirements
(e.g. brake master cyl-
inder)
Surface protection coat-
ing with primarily high
wear protection re-
quirements and/or high
corrosion protection
requirements
(e.g. brake master cyl-
inder, piston ring groo-
ve)
Surface protection coat-
ing with primarily high
wear protection re-
quirements and/or high
corrosion protection
requirements
(e.g. brake caliper hous-
ing)
3.2 General requirements
Approval of first supply and changes according to VW 01155.
Avoidance of hazardous substances according to VW 91101.
10 finished parts are required for complete testing.
The protective coatings must not exhibit any pores, cracks, damage, or other flaws that impair the corrosion protection and/or specified appearance.
3.3 Appearance
location cleanedThese requirements apply to surface protection types Ofl-w610, Ofl-w620, Ofl-w630 and Ofl-w640. The specimens are evaluated with the naked eye and in natural light.
The component properties regarding finish (e.g. degree of glossiness or structure) and color shall be evaluated according to the released original sample. Corresponding maximum deviation sam-ples sh
all be specified by the persons responsible for quality in standard production monitoring. Part finish shall be free of polishing flaws, scratches, damages or similar flaws that impair the ap-pearance of the part. The whole surface of the component shall not display patchiness, shades or loss of glossiness.
3.4 Coating thickness
The coating thickness is determined according to DIN EN ISO 2360 or DIN EN ISO 1463. In case of conflict, specifications according to EN ISO 1463 shall apply. The measurement location for spe-cial functional areas must be specified in the drawing.
The specifications stated in Table 3 shall be used as a basis.
Component-specific requirements must be established in the drawing.
The arithmetical mean value over the evaluated measurement length is valid as the coating thick-ness.
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TL 212: 2006-12
Table 3
Protection type Coating thickness (in µm)
Ofl-w180    2 to 5
Ofl-w610/w620    5 to 10
Ofl-w630/w640 8 to 15
Ofl-w660/w670 ≥ 2
Ofl-w680 8 to 15
Ofl-w690/w695 > 25 1)
1) "Zero points" are permissible for alloys with silicon contents > 8% as long as the functionality of
the surface is assured. The coverage rate of the surface must be at least 85% of the observed
measurement length. The zero-point width in the metallographic microsection must not exceed
60 µm.
3.5 Corrosion resistance
3.5.1 Testing in a neutral salt spray atmosphere
Test atmosphere according to DIN EN ISO 9227, 240 h for surface protection type Ofl-w180, 480 h for all others;
Requirement: no change in the surface’s appearance caused by corrosion.
3.5.2 Moisture condensate alternating atmosphere test
These requirements apply to surface protection types Ofl-w610, Ofl-w620, Ofl-w625, Ofl-w630 and Ofl-w640.
Test: 5 cycles according to DIN 50018-KFW 2.0 S;
Requirement: no change in the surface appearance caused by corrosion; in case decorative ele-ments display slight staining or patchiness after testing, it must be possible to remove this using polishing cotton or a light commercial polishing agent.
3.6 Sealing quality
3.6.1 Loss of absorptive power
These requirements apply to surface protection types Ofl-w610 and Ofl-w620.
Test: according to DIN EN 12373-4;
Requirement: loss of absorptive power ≤ characteristic value 1.
3.6.2 Alkali resistance (only for decorative parts applied on the vehicle exterior)
These requirements apply to surface protection types Ofl-w610, w620, w630 and w640.
Test method:
If the specimen is soiled with oil, grease or similar substances, the surface shall be cleaned with a suitable solvent and dried prior to the test.
A part of the length of the specimen is dipped into a test solution not containing aluminum in accor-dance with Table 4.
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TL 212: 2006-12
Table 4 – Manufacturing the formulation solution
Ofl-w610, Ofl-w620, Ofl-w630 and Ofl-w640
Test solution for surface pro-
tection types
pH value (theoretical) pH = 12,5
Bulk solution made from  1,27g sodium hydroxide
with the addition of 4,64 g sodium phosphate dodecahydrate (corresponding to 2 g
sodium phosphate) and
0,33 g sodium chloride (corresponding to 200 mg chloride)  dissolved in distilled water and then topped up to 1 liter
The requisite chemicals are available, for example, from Merck, order no. 1.06469.1000 (sodium hydroxide), 1.06572.1000 (sodium phosphate dodecahydrate) and 1.06404.1000 (sodium chloride). The specimen is half-submerged in this test solution at a temperature of +18 °C to +20 °C for 10 min.
The surface of the specimen is then rinsed with distilled (or fully desalinated) water and dried in air. Before evaluation, the specimen may be treated with a commercial polishing agent or with an a-queous suspension of magnesium oxide and polishing cotton on the surface to be evaluated. Requirement:
After submersion in the test solution with a pH value of at least 12,5, visual surface changes that seriously impair the appearance, such as a pronounced white boundary where the specimen was dipped, are not permissible.
3.7 Temperature resistance
These requirements apply to surface protection types Ofl-w610, Ofl-w620, Ofl-w630 and Ofl-w640. Test: 1 h at +100 °C;
Requirement: no visible cracks in the oxide coating
3.8 Weather resistance
These requirements apply to surface protection types Ofl-w630 and Ofl-w640.
Test according to Test Specification PV 3929, intensity of irradiation 400 MJ/m².
Requirement: no visual surface change.
3.9 Coating hardness (applies to Ofl-w690, w695)
These requirements apply to surface protection types Ofl-w690 and Ofl-w695.
Test: Vickers microhardness according to DIN EN ISO 4516.
Requirement: (450 to 550) HV 0,025.
4 Referenced standards1
PV 3.3.3 Farben und Lacke; Prüfung der Kratzfestigkeit von Klarlacken (Paints and Varnishes; Test of the Scratch Resistance of Clear Coats – currently only
available in German)
1 In this Section, terminological inconsistencies may occur as the original titles are used.
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PV 3929 Non-Metallic Materials; Weather Aging in Dry, Hot Climate
VW 01155 Vehicle Supply Parts; Approval of First Supply and Changes
VW 13750 Surface Protection of Metal Parts; Surface Protection Types, Codes
VW 91101 Environmental Standard for Vehicles; Vehicle Parts, Materials, Operating Flu-ids; Avoidance of Hazardous Substances
DIN 50018 Testing in a Saturated Atmosphere in the Presence of Sulfur Dioxide
DIN EN 12373-4 Aluminum and Aluminum Alloys – Anodizing – Part 4: Estimation of Loss of Absorptive Power of Anodic Oxidation Coatings after Sealing by Dye Spot Test
with Prior Acid Treatment
DIN EN ISO 1463 Metallic and Oxide Coatings – Measurement of Coating Thickness – Micro-scopical Method
DIN EN ISO 2360 Non-Conductive Coatings on Non-Magnetic Electrically Conductive Basis Ma-terials – Measurement of Coating Thickness – Amplitude-Sensitive Eddy Cur-
rent Method
DIN EN ISO 4516 Metallic and Other Inorganic Coatings – Vickers and Knoop Microhardness Tests
DIN EN ISO 9227 Corrosion Tests in Artificial Atmospheres – Salt Spray Tests

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