E-Coat Is an Immersion Painting Technique That Offers Excellent Coverage on Complex Parts With An Even Thickness


E-Coat
E-Coat


E-Coat is a unique coating process that was developed for steel car bodies. It is now widely used on products like hardware, jewelry, eyeglass frames, and giftware to provide decoration as well as protection. The E-Coa immersion process provides excellent coverage on complex parts with an even thickness without runs or drips. The coating is durable enough to stand up to rigorous salt spray, adhesion, dielectric, and acid resistance tests.

After metal fabrication the part is submerged in an electrocoat solution that contains de-ionized water and paint solids. When a direct current (DC) is applied to the coating solution, each charged paint particle is attracted to the oppositely charged surface of the metal. Paint is evenly deposited on the metal until a predetermined film build insulates the part, at which point attraction stops and the coating is complete. The ability to precisely control the thickness of the E-Coa is a major advantage over plating and anodizing. This makes it an ideal choice for materials that need a thick finish, such as the wrought iron used in many fire truck components. It also offers a very smooth, consistent deposit and can be tinted to create decorative finishes E-Coa produces less VOCs and liquid waste than powder spraying. This translates into significantly lower disposal costs, as the reclaimed paint solids and solvent from two post rinses are returned to the tank for reuse.

According to Coherent Market Insights the E-Coat Market Industry Insights, Trends, Outlook, and Opportunity Analysis, 2022-2028.

Unlike plating or anodizing, E-Coat requires much lower voltage and shorter time. This gives more control over the thickness on the product. It also allows to coat parts that aren’t easily accessible, including internal components and areas of the part that are hard to reach. The process starts with pre-treating metal surface and cleaning it. Then, it’s dipped in a bath that’s filled with paint solids that contain either a positive or negative electrical charge. The current passed through the solution attracts the particles to the product’s surface, depositing them into an even layer that’s cured in an oven.

After the coating dries, engineers may add a second coat or more if needed. E-Coat is also incredibly durable, which means that the fire apparatus won’t be prone to corrosion. It is, however, sensitive to UV light and will break down if exposed directly. This can be mitigated by using a topcoat that’s built to withstand UV exposure. Sherwin-Williams Company declared the acquisition of Sika AG's European industrial coatings division in April 2022. The company will be incorporated in the Performance Coatings Group operating segment.

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