{"id":4328,"date":"2026-04-28T10:00:29","date_gmt":"2026-04-28T08:00:29","guid":{"rendered":"https:\/\/www.appcz.eu\/?p=4328"},"modified":"2026-04-13T12:27:44","modified_gmt":"2026-04-13T10:27:44","slug":"galvanising-or-cathodic-dip-coating-how-to-choose-the-right-surface-treatment-for-automotive-parts","status":"publish","type":"post","link":"https:\/\/www.appcz.eu\/en\/galvanising-or-cathodic-dip-coating-how-to-choose-the-right-surface-treatment-for-automotive-parts\/","title":{"rendered":"Galvanising or cathodic dip coating? How to choose the right surface treatment for automotive parts"},"content":{"rendered":"

Surface protection of metal components is a critical factor in the automotive industry, directly influencing durability, quality, and production efficiency. While hot-dip galvanising is primarily used for heavy steel structures, cathodic dip coating (KTL) dominates applications that require precision, clean threads, and protection of internal cavities. Each technology has its own specific properties and optimal use cases.<\/strong><\/p>\n

Galvanising in modern automotive: Reaching its limits<\/span><\/h2>\n

Hot-dip galvanising is a proven technology widely used where <\/span>long-term resistance in demanding environments<\/b> is a priority. The principle is simple: a steel component is immersed in molten zinc, forming a thick protective layer made of iron-zinc alloy. The main advantage lies in the coating thickness \u2013 typically ranging from tens to hundreds of micrometres. This provides excellent mechanical resistance and long-term corrosion protection, especially in exterior conditions.<\/span><\/p>\n

However, this thickness also <\/span>introduces <\/b>limitations that are critical in automotive applications<\/b><\/a>. A thicker and less uniform layer can negatively affect tight tolerances, threads, and mating surfaces. For smaller or more complex parts, additional post-processing is often required, <\/span>increasing both costs and production time.<\/b> This is where galvanising begins to fall short of modern automotive requirements.<\/span><\/p>\n

KTL: Uniform protection even in hard-to-reach areas<\/span><\/h2>\n

Cathodic dip coating (KTL)<\/b><\/a> is a technology that has seen significant development within the automotive sector. It is an electrochemical process in which the coating is evenly deposited across the entire surface of a component \u2013 <\/span>including cavities, edges, and hard-to-reach areas<\/b>. The resulting coating is significantly thinner (typically 15\u201335 \u00b5m), yet highly uniform and precisely controlled. This allows threads to remain functional, ensures accurate fits, and maintains dimensional stability without the need for additional processing.<\/span><\/p>\n

From a technical perspective, KTL is particularly suitable for:<\/b><\/p>\n