KTL Coating - Corrosion Protection for Metal Surfaces

Impact- and scratch-resistant, corrosion-resistant, and formable: Cathodic dip coating (KTL for short) meets exceptional technical requirements.

If you want to apply a corrosion-resistant and impact-resistant coating to a large number of workpieces or complex structures, cathodic dip coating (KTL) is the ideal solution. The KTL coating is considered one of the most efficient coating processes for metal surfaces in the (automotive) industry. With a KTL coating, metal surfaces can be provided with uniform coating thicknesses and good surface qualities.

The KTL coating is an electrochemical process. The coating is deposited by an electric current flowing from an external electrode (anode) through the conductive coating to the workpiece (cathode)—similar to electroplating.

The result is a very homogeneous coating on metal surfaces with uniform layer thicknesses ranging from 15 to 40 µm and good surface quality.

The final heat treatment at an oven temperature of approximately 210 °C results in cross-linking.
The coating meets all standard testing requirements from Automotive, agriculture, industry, etc. (PV1210, salt spray, VDA cyclic tests, stone impact test, etc.).

The coating is corrosion-resistant against acids and alkalis and is resistant to oils and solvents.
The KTL coating provides a uniform, heavy-metal-free finish on aluminum, magnesium, cast iron, and steel alloys and is primarily used in mechanical engineering, the automotive industry, and aerospace engineering.

We offer the KTL process for the following materials:
• Steel (sheet metal and castings)
• Galvanized steel
• Aluminum

The advantages of cathodic dip coating

KTL coating is considered one of the most efficient coating processes for metal surfaces in industry. A major advantage of KTL coating is the uniform coverage of metal surfaces combined with high surface quality. This makes the KTL process suitable even for complex molded parts and very small components. Dip coating provides effective and long-lasting cathodic corrosion protection—or rust protection—with high temperature and chemical resistance, despite its thin film thickness. It is scratch-resistant, resistant to stone chips, and, thanks to its high-quality primer, allows for subsequent painting.

Commercial vehicles, in particular, benefit from this, as the method makes them more durable and robust. KTL coating is free of heavy metals and has an organic solvent concentration of approximately 1%. It is well-suited for automated coating and meets the high coating standards of the automotive industry, not least because of its comprehensive resistance to fuels, oils, and brake fluids.