EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of VW TL 217 test. This standard specifies requirements for electrolytically deposited zinc coatings on steel that do not contain Cr(VI). Coatings are not suitable for long-term use at height. Surface protection type Ofl-c340 should preferably be used for welding studs, welding screws, welded joints.
Unless certain parts of a part marked in the drawing are excluded from the surface coating, the entire surface of the part must conform to the required type of surface protection and exhibit the specified properties.
For components with process-related weak points, such as bend radii or threaded areas of the body and coupling elements, the corrosion protection requirements in these areas are reduced to 2/3. This exception does not apply to wheel bolts.
In addition, the specifications in DIN EN ISO 4042 regarding the maximum possible thickness of the electroplated coating on the thread profile must be observed. Protective coatings must not exhibit any pores, cracks, damage or other defects that impair corrosion protection or the specified appearance.
In addition, the layers should adhere securely to the base material and should not flake off during slight deformation. The manufacturing process must be designed and controlled so as not to impair the functional properties of the finished part. In particular, the pretreatment and heat treatment methods should be properly selected and combined to ensure that hydrogen embrittlement does not occur.
All heat treatments to prevent hydrogen embrittlement should be carried out as soon as possible after deposition, no more than 4 hours, and before any other treatment is applied to the coatings.
EUROLAB assists manufacturers with VW TL 217 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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