What is the purpose of caustic cleaning in surface preparation?

The purpose of caustic cleaning in surface preparation is primarily centered around its ability to effectively remove contaminants such as dirt, oil, and grease from the surface of the material being treated. Caustic cleaners typically contain strong alkaline substances that break down organic compounds, making it easier to wash away residues that could interfere with subsequent coating applications. This step is critical in ensuring optimal bonding between the substrate and the coating, as any remaining contaminants can lead to adhesion failure and ultimately compromise the durability of the coated surface.

While caustic cleaning may have secondary benefits, such as improving the surface's overall appearance or preparing it for further treatment, its main function is to provide a clean substrate by eliminating surface impurities. This ensures a proper base for coating, leading to enhanced performance and longevity of the protective layers applied afterward.