Zink different. Siegener Verzinkerei Gruppe - Oberflächenveredlung
High-temperature galvanizing (HTV)
High-temperature galvanizing is a more advanced hot-dip process, where steel components are coated in a ceramic-lined, induction-heated pot at temperatures between 560 and 630 °C. Depending on the customer's specification, very thin coats ranging from about 25 µm up to 80 µm in accordance with DIN EN ISO 1461 may be applied.
The protective effect of a high-temperature zinc alloy layer is identical to that obtained in a normal-temperature galvanizing process. The benefits of this process also include special product properties such as accuracy of fit, coatability and greater surface hardness.
Accuracy of fit:
As a result of the higher galvanizing temperature and the substantially lower viscosity of the liquid zinc, the zinc alloy flows more easily off the component. After previous coordination of the components, even the smallest drill holes or threads can be hot-dip galvanized without the need to rework them afterwards. This is particularly important for meeting the requirements of ready-to-mount products.
Extremely thin, extremely hard:
The iron-zinc alloy layers produced in the high-temperature galvanizing process feature a high surface hardness with improved abrasion and wear resistance. This is particularly suitable for vehicle parts exposed to flying objects. A special process management results in extremely thin, lightweight layers with a narrow variation range that can be reproduced.
Coatability:
In high-temperature galvanizing, high surface precision is guaranteed thanks to a controllable zinc layer thickness which is almost independent of the material. There is virtually no uncontrolled growth of the zinc layer thickness, above all on weld seams or in edge areas. This reduces costly and time-consuming finishing to a minimum. Furthermore, the fine micro-roughness of the zinc layer is an ideal etch primer for all subsequent coating systems.