VW 13750 en
VW 13750 en
VW 13750 en
Issue 2016-12
Class. No.: 50204
Descriptors: corrosion, rust protection, surface protection, metal, metal part, surface protection type, code, corrosion
protection
Previous issues
VW 13750: 1953-06, 1954-07, 1956-10, 1958-04, 1959-03, 1959-06, 1963-03, 1963-05, 1966-06,
1966-06, 1966-10, 1967-05, 1967-11, 1969-10, 1970-11, 1971-12, 1972-02, 1974-08, 1975-06,
1976-07, 1980-09, 1983-10, 1986-10, 1989-12, 1991-11, 1994-10, 1999-04, 2005-02, 2008-01,
2008-06, 2014-05
Changes
The following changes have been made to VW 13750: 2014-05:
Section 3.1 "Basic requirements" revised
Section 3.5 "Friction behavior" expanded
Section 3.6 "Zinc and zinc alloy coatings" updated
Section 3.9 "Parts without surface protection" revised
Table 2: updated, Ofl-a103, Ofl-t670, Ofl-t680, and Ofl-z305 added, paint finishes "x": descrip
tions adapted to the most recent Technical Supply Specification (TL) version; additionally, Ofl-
x638 and Ofl-x639 added; codes Ofl-r647 and Ofl-r648 deleted
Appendix A.2 "Omitted surface protection types containing Cr(VI)" deleted
Additional technical and editorial changes
All rights reserved. No part of this document may be provided to third parties or reproduced without the prior consent of one of the Volkswagen Groups Standards departments.
Volkswagen Aktiengesellschaft VWNORM-2015-07d
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VW 13750: 2016-12
Contents
Page
1 Scope ......................................................................................................................... 2
2 Designation ................................................................................................................ 2
2.1 Structure of codes ...................................................................................................... 2
2.2 Designation example .................................................................................................. 3
3 Requirements ............................................................................................................. 3
3.1 Basic requirements .................................................................................................... 3
3.2 Specifications in drawings .......................................................................................... 4
3.3 Weldability .................................................................................................................. 4
3.4 Agents impairing wetting ability .................................................................................. 4
3.5 Friction behavior ......................................................................................................... 4
3.6 Zinc and zinc alloy coatings ....................................................................................... 5
3.7 Screws, bolts, nuts, threaded parts, and molded parts .............................................. 5
3.8 Commercial surface protection types ......................................................................... 5
3.9 Parts without surface protection ................................................................................. 6
3.9.1 Metal parts except for the parts in section 3.9.2 ........................................................ 6
3.9.2 Fasteners with a metric ISO thread ............................................................................ 6
3.10 Assignment of surface protection types and codes .................................................... 6
4 Applicable documents .............................................................................................. 13
Appendix A Surface protection types as per VDA 235-104 ......................................................... 16
A.1 Surface protection types as per VDA 235-104 and VW 13750 ................................ 16
1 Scope
This standard applies to the identification of general surface protection types for vehicle parts and
units in drawings and technical documentation.
Volkswagen standard VW 13750, supplement 1 lists all invalid surface protection types that were
contained in earlier issues of VW 13750.
2 Designation
3 Requirements
Figure 2 Figure 3
If different surface treatments are specified for a single part, "See drawing" must be entered under
"Surface protection". The affected areas on the part must be clearly delineated.
If parts from one ASSY are coated individually (one or several different surface treatments), then
"See drawing" is entered under "Surface protection" in the assembly drawing. The surface treat
ments are then listed individually on a part-specific basis in the respective drawing itself.
3.3 Weldability
If parts with surface protection are to be welded together with one another or with other metal
parts, then the parts must be tested for weldability.
Ofl-c340 must be reserved as the standard surface protection type for welding parts in car body
manufacture (e.g., for weld nuts).
lubricant must not deteriorate within a storage period of 6 months in weather-sheltered rooms. The
storage temperature must be between -5 C and 40 C.
Fasteners made of stainless or heat-resistant materials may require an additional lubricant treat
ment in order to meet the requirements in VW 01129.
The influence of the surface protection on the friction behavior, particularly for parts with a metric
ISO thread, must be determined by means of tests and matched to the performance characteristics
(see VW 01131-1 and VW 01131-2).
For coatings without lubrication, there is no guarantee that the coefficient-of-friction range as per
VW 01129 is adhered to.
NOTE 1:Fasteners without lubrication usually meet the criteria of friction class D or E in Associa
tion of German Engineers (VDI) technical rule VDI 2230, sheet 1, table "Assignment of coefficient-
of-friction classes with reference values for various materials/surfaces and lubrication conditions in
threaded connections." For parts without lubricant treatment and a locking or adhesive coating with
a set thread coefficient of friction, a coefficient-of-friction range of tot = 0.18 to 0.25 must be ad
hered to.
given part, only the code letter for the respective procedure and the numbers 010 must be
provided. The designation will then read, e.g., for commercial paint: Ofl-x010.
The commercial surface protection types, e.g., Ofl-c010, "commercial zinc coating," and Ofl-r010,
"commercial electroplated zinc alloy coating," must not contain any Cr(VI) compounds.
The avoidance of hazardous substances as per VW 91101 also applies to commercial surface pro
tection types.
Without post-treatmentf),
- c310 c610
silver color
Without post-treatmentl),
g100 g300 g600
silver color
Tin electroplatedk) Bright tin-plated Without post-treatmentl),
g treated with lubricant, - - g605h)
silver color
Without post-treatment,
Hot-dip tin-platedk) g120 g320 g620
silver color
k Copper electroplated Without post-treatment k110m) - -
Transparent passivationg),
Alloyed with Fe; - r301 -
silver color
TL 153
Passivated, sealed, black - r302 -
Transparent passivation
(silver to slightly iridescent - - r642c)
blue color)g)
Alloyed with Ni, alka Sealing and transparent
- - r643n)
line; TL 244 passivationg) (silver color)
Electroplated zinc alloy Sealing and transparent
r
coatinge) passivation, treated with - - r645 h)
lubricantg) (silver color)
Transparent passivation,
Alloyed with Ni, weakly
silver color, only for - - r649
acidic; TL 244
castingsg)
Passivated, black - - r672c)
Alloyed with Ni, alka Passivated, sealed, black - - r673n)
line; TL 244
Passivated, sealed, trea
- - r677 h)
ted with lubricant, black
Zinc coating as per
TL 217, phosphated plus
- - s611
cathodic electrocoating, jet
black
Duplex coating (zinc or
Zn/Ni alloy coating as per
s zinc/nickel plus cathodic TL 196
TL 244, phosphated plus
electrocoating) - - s621
cathodic electrocoating, jet
black
Zn/Ni alloy coating as per
- - s627h)
TL 244, phosphated plus
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VW 13750: 2016-12
a) No base metal corrosion after four hours in the condensation test atmosphere with constant humidity as per DIN EN ISO 6270-2.
b) If necessary, after being phosphated, steel parts with tensile strength values greater than 1 200 MPa must be subjected to an ap
propriate heat treatment with a temperature of up 200 C in order to prevent brittle fractures induced by hydrogen (DIN EN 9717).
In addition to the specifications in table 2, the following periods of time must be observed for the individual protection classes when
performing the neutral salt spray test as per DIN EN ISO 9227:
Ofl-b100, Ofl-b101 2 hours, without base metal corrosion
Ofl-b110 6 hours, without base metal corrosion
Ofl-b111, Ofl-b113 48 hours, without base metal corrosion
NOTE 2:Ofl-b111 = Ofl-b100 + (2-m to 4-m) zinc flake coating; light abrasion, high susceptibility to soiling of other parts in the
event of contact.
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VW 13750: 2016-12
NOTE 3:Ofl-b113 = Ofl-b149 + (2-m to 4-m) zinc flake coating + (2-m to 3-m) top coat (lubricant additive); less abrasion than
for Ofl-b111.
c) Suitable for fasteners used in the body-in-white and for fasteners with adhesive coatings as per DIN 267-27, locking coatings as per
DIN 267-28, and sealing coatings as per TL 195.
d) For threaded parts, only oil or oil emulsions are permissible.
e) Immediately after surface treatment, steel parts that are subject to tensile loads and have tensile strength values greater than
1 000 MPa must be subjected to an appropriate heat treatment in order to prevent brittle fractures induced by hydrogen. This must
be verified by means of the static tensile test in DIN 50969-1 and DIN 50969-2.
f) For parts to be painted in-house.
g) Electro-galvanized components with Cr(VI)-free passivation must not appear yellowish. This in order to be able to distinguish these
components from the yellow chromate conversion coatings containing Cr(VI) that were often used in the past.
h) Metric ISO threaded parts must be treated with lubricant as per TL 52132.
i) Preferably for steel parts in ASSYs with magnesium in order to prevent bimetallic corrosion.
j) Ofl-e310, Ofl-e320 = Coating thickness > 10 m
Ofl-e610, Ofl-e620 = Coating thickness > 20 m.
k) Requirements for:
Protection class 1: Steel substrate coating thickness > 4 m; copper substrate coating thickness > 4 m
Protection class 3: Steel substrate coating thickness > 12 m; copper substrate coating thickness > 8 m
Protection class 6: Steel substrate coating thickness > 20 m; copper substrate coating thickness > 15 m
l) For steel parts in ASSYs with magnesium in order to prevent bimetallic corrosion, but only when electrical conductivity is required.
m) Ofl-k110 = Coating thickness of (3 +3) m.
n) Preferred surface protection type for self-tapping screws and PT screws.
o) Metric ISO threaded parts must be treated with lubricant as per TL 52165.
p) Contains PTFE, not suitable for adhesive bonds.
q) No change to the surface after 120 h of the neutral salt spray test as per DIN EN ISO 9227 (e.g., no zinc corrosion on zinc die-
castings).
r) No change to the surface after 240 h of the neutral salt spray test as per DIN EN ISO 9227 (e.g., no zinc corrosion on zinc die-
castings; this surface protection consists of a passivation coating plus a post-dip solution containing phosphate)
s) In order to create a specific surface structure, a special pickling stage, e.g., E0/E6, is required.
t) Color as per drawing; otherwise, black.
u) Requirements also apply to dip-primed body components.
v) Sn: (70 12)%, balance: Zn. Coating thickness 5 m. No base metal corrosion after 360 h of the neutral salt spray test as per
DIN EN ISO 9227.
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VW 13750: 2016-12
4 Applicable documents
The following documents cited in this standard are necessary to its application.
Some of the cited documents are translations from the German original. The translations of Ger
man terms in such documents may differ from those used in this standard, resulting in terminologi
cal inconsistency.
Standards whose titles are given in German may be available only in German. Editions in other
languages may be available from the institution issuing the standard.
QP A001 Prelube, Hot Melt, Blank Washing Oil, Drawing Compound, Slushing Oil
(General); Quality Requirements
TL 134 Non-Electrolytically Applied Zinc Flake Coatings with Organic Coating
for Increased Corrosion Protection Requirements; Requirements and
Testing
TL 153 Zinc/Iron Coatings; Surface Protection Requirements
TL 178 Cathodic Electrocoating of Body Skin Parts Made from Aluminum Semi-
Finished Products; Surface Protection Requirements
TL 180 Non-Electrolytically Applied Zinc Flake Coatings with Black Top Coat;
Surface Protection Requirements
TL 182 Duplex Coating on Aluminum Parts; Surface Protection Requirements
TL 184 Zinc Thermal Diffusion Layers(Zn-ThD Layers); Surface Protection Re
quirements
TL 194 Coating for Fasteners in Contact with Magnesium; Surface Protection
Requirements
TL 195 Mechanical Fasteners; Steel Metric Bolts with Sealing All-Around Coat
ing; Materials Requirements
TL 196 Duplex Coating Systems for Small Parts and Bulk Parts; Surface Protec
tion Requirements
TL 203 Decorative Chrome Plating (Ni-Cr Coatings) on Metal Components; Sur
face Protection Requirements
TL 212 Oxide Coatings on Aluminum Parts; Surface Protection Requirements
TL 214 Zinc Dust Paint Coating; Surface Protection Requirements
TL 217 Zinc Coatings; Surface Protection Requirements
TL 218 Body Color Multicoat Paint on Metallic Exterior Body Components; Re
quirements
TL 227 Single-Layer Paint Coating of Zinc-Coated Metal Surfaces; Surface Pro
tection Requirements
TL 233 Non-Electrolytically Applied Zinc Flake Coatings with an Organic Top
Coat; Surface Protection Requirements
TL 235 Manganese Phosphated Surfaces; Requirements
TL 240 Thin-Layer Zinc Phosphating; Surface Protection Requirements
TL 244 Zinc/Nickel Alloy Coatings; Surface Protection Requirements
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VW 13750: 2016-12
DIN 267-27 Fasteners - Part 27: Steel screws, bolts and studs with adhesive coating,
Technical specifications
DIN 267-28 Fasteners - Part 28: Steel screws, bolts and studs with locking coating,
Technical specifications
DIN 50938 Black oxide coatings on ferrous metal components - Requirements and
test methods
DIN 50969-1 Prevention of hydrogen-induced brittle fracture of high-strength steel
building elements - Part 1: Advice on the prevention
DIN 50969-2 Prevention of hydrogen-induced brittle fracture of high-strength steel
building elements - Part 2: Test methods
DIN EN 9717 Metallic and other inorganic coatings - Phosphate conversion coating of
metals
DIN EN ISO 1478 Tapping screw thread
DIN EN ISO 4042 Fasteners - Electroplated coatings
DIN EN ISO 6270-2 Paints and varnishes - Determination of resistance to humidity - Part 2:
Procedure for exposing test specimens in condensation-water atmos
pheres
DIN EN ISO 9227 Corrosion tests in artificial atmospheres - Salt spray tests
DIN ISO 8992 Fasteners - General requirements for bolts, screws, studs and nuts
VDA 235-104 Cr(VI)-free surface protection for mechanical fasteners with metric
thread
VDI 2230, sheet 1 Systematic calculation of highly stressed bolted joints - Joints with one
cylindrical bolt
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VW 13750: 2016-12
Table A.1
Designation
Type of surface protection coating As per VDA 235-104 As per VW 13750
Thin-layer phosphating VDA 235-104.10 Ofl-b140
Galvanized zinc coating,
VDA 235-104.20 Ofl-c347
transparent passivation
Electroplated
zinc alloy coating, VDA 235-104.25 Ofl-r645
transparent passivation
Electroplated
Ofl-r302 or Ofl-r677, no direct
zinc alloy coating, VDA 235-104.30
equivalence possible
black passivation
Zinc flake coating,
VDA 235-104.40 Ofl-t610
silver gray
Zinc flake coating
with top coat containing lubricant, VDA 235-104.42 Ofl-t647
silver color
Zinc flake coating
with top coat containing lubricant, VDA 235-104.50 Ofl-t667, Ofl-t630
black