As outlined in the article “Powder Coating vs Wet Paint” by Reliance Foundry, the realm of surface finishing is of utmost importance when dealing with reactive metals like ductile iron and carbon steel. The battle against rust, which forms due to the reaction between iron and oxygen, necessitates effective protection through surface coatings. Beyond mere aesthetics, the exterior coatings act as functional barriers against corrosion.
The foundation of both powder coating and wet paint comprises resins, additives, and pigments. However, a pivotal divergence exists in the solvent content: wet paint contains solvent, while powder coating does not.
It emphasizes that the solvent within wet paint maintains the other components in a suspended liquid state. In contrast, powder coating is administered as a dry powder. This fundamental disparity in chemical composition influences all other aspects—application technique, color matching, texture, and even operator training requirements.
Application processes, despite the varying physical states of the coatings, exhibit surprising parallels in industrial practices.
For the powder coating procedure, a negatively charged dry powder is propelled through an electrostatic gun onto the metal surface. The attraction between the charged powder and the grounded part ensures rapid and uniform application. Subsequent curing in an oven solidifies the powder, forming thermal bonds that yield a durable, smooth finish.
In the case of liquid paint, it is dispensed through a fine spray. While electrostatically charged, the effect is less pronounced than in powder coating. Unlike powder coating’s effortless application, liquid paint demands highly skilled experts to avoid issues like drips and sags. Some liquid paints air dry, while others necessitate curing in an oven.
Both powder coating and liquid paint typically involve a primer and color coats. However, liquid paint might incorporate multiple color coats and a clear top coat.
For comprehensive insights into the realm of surface finishing and to grasp the nuances of powder coating versus wet paint, refer to the complete article: “Powder Coating vs Wet Paint.”
Click here to explore Trans-ACC’s expertise in advanced metal finishing solutions.
Photo and article with all rights reserved, courtesy of reliance-foundry.com/