大众汽车达克罗标准TL217

Group standard TL 233

Issue 2016-10 Class. No.:50223

Descriptors:corrosion protection, surface protection, zinc, aluminum flake, zinc flake, base coat, top coat, organic

coating, t330, t350, t630, t650

Non-Electrolytically Applied Zinc Flake Coatings with an Organic Top Coat Surface Protection Requirements

Preface

In contrast to the surface protection (Ofl) types specified in Technical Supply Specification

TL 180 1) and TL 245 2), this TL describes a coating system which ensures the functional character‐istics of components, e.g., the color and/or corrosion protection, additionally by means of a consis‐tent organic top coat with a greater coating thickness.

For new designs, if fasteners with a metric ISO thread are used, the use of surface protection types as per TL 180 1) (black) or TL 245 2) (silver) is preferred.

For spring clamps on fuel hoses, coatings as per TL 134 3) must be used.

Previous issues

TL 233: 1982-09, 1983-02, 1991-05, 1992-06, 1993-11, 1998-02, 2003-09, 2003-11, 2010-11, 2016-09

Changes

The following changes have been made to TL 233: 2016-09:

–Correction in attachment 1 of appendix A "Released surface protection systems"

1)TL 180 – Non-Electrolytically Applied Zinc Flake Coatings with a Black Top Coat; Surface Protection Requirements

2)TL 245 – Non-Electrolytically Applied Zinc Flake Coatings; Surface Protection Requirements

3)TL 134 – Non-Electrolytically Applied Zinc Flake Coatings with Organic Coating for Increased Corrosion Protection Requirements;

Requirements and Testing

Always use the latest version of this standard.

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 is alone authoritative and controlling.

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TL 233: 2016-10

Scope

This standard defines requirements and tests of surface protection types comprising non-electrical‐ly applied zinc flake coatings, with an additional organic top coat, on iron materials.

The coating systems as per this standard can be used at temperatures up to a maximum of 180 °C.

Because, with proper pretreatment, no risk of hydrogen embrittlement arises as a result of the coating process, this coating is also suited as corrosion protection for hardened and high-strength steel parts with tensile strength values ≥ 1 000 MPa or surface hardness values > 320 HV (Vickers hardness). The individual coats are applied primarily using a dip-spinning method.

Coatings as per this standard are not suited for components with an electrically conducting function (e.g., ground connections).

Designation Depending on the protection class and on the lubricant content (see table 1), a distinction is made between four surface protection types for the coating system as per this standard, which are desig‐nated with the following codes as per the specifications in Volkswagen standard VW 13750, sec‐tion "Designation":

Ofl-t330

Ofl-t350

Ofl-t630

Ofl-t650

Requirements Appearance of the top coat, lubricant additive, and protection class

The surface protection types of the coating system must meet the requirements specified in table 1.

The released protection systems are listed in appendix A.

Table 1 – Appearance, lubricant additive, and protection class

a)If a silver appearance of the top coat is required, the code for the surface protection type is expanded with the addendum "silver."This applies to other color specifications as well.

Basic requirements

Approval of first supply and changes as per VW 01155

1 2 3

3.1 3.2