A Seamless, Pinhole-Free Protective Barrier.

The inability to get full paint coverage on complex parts with hidden surfaces is a primary cause of field failures and warranty claims due to corrosion. The definitive solution is an electrophoresis coating production line. Unlike spraying, which is a "line-of-sight" process, E-coating is a "field-effect" process. The electrical field between the anodes in the tank and the part being coated extends into every cavity and recessed area. The charged paint particles follow these electrical field lines, allowing them to be deposited in areas that are completely inaccessible to a spray gun. The process is also self-limiting, so as the outer surfaces become coated and insulated, the electrical current naturally seeks the path of least resistance, which is the bare metal in the most hidden areas. This is why a TIMS electrophoresis coating production line can guarantee complete, uniform coverage, regardless of part complexity.

A significant area of innovation for the electrophoresis coating production line is the development of low-temperature-cure E-coat formulations. Traditionally, E-coat requires curing temperatures of around 175-185°C (350-365°F). This consumes a great deal of energy and limits the types of products that can be coated, as it can damage heat-sensitive components or complex assemblies. New paint technologies are emerging that can be fully cured at temperatures as low as 120°C (250°F). At TIMS, we are actively working with paint suppliers to engineer and optimize the electrophoresis coating production line of the future to take advantage of these new materials. This will dramatically reduce energy costs for our clients and open up the superior protection of E-coating to a whole new range of products and industries.

Aluminum wheels require a finish that is both highly aesthetic and extremely durable, able to withstand rock chips, road salt, and harsh cleaning chemicals. The ideal finishing process involves an electrophoresis coating production line as the foundation. However, aluminum requires a special pretreatment process—typically a zirconium-based or chrome-free conversion coating—to ensure proper adhesion. After pretreatment, a cathodic acrylic E-coat is applied. This specific type of E-coat is chosen for its excellent UV resistance and smooth surface, making it a perfect primer for a subsequent decorative powder or liquid topcoat. This multi-layer system, starting with a properly applied E-coat from a specialized TIMS electrophoresis coating production line, is what gives high-end OEM and aftermarket wheels their signature beauty and long-lasting durability.

When evaluating an electrophoresis coating production line, the most critical distinction is between cathodic and anodic systems. In an anodic system, the part to be coated is the anode (positive electrode). During the process, a small amount of iron from the part's surface dissolves into the paint film, which compromises the adhesion and corrosion resistance. In a cathodic system, the part is the cathode (negative electrode). No metal dissolves from the part, resulting in a much purer, more robust coating with vastly superior adhesion and corrosion resistance. While anodic systems are older and less expensive, virtually all modern high-performance applications, especially in the automotive industry, exclusively use the cathodic electrophoresis coating production line due to its significant performance advantages. TIMS specializes in advanced cathodic systems to provide the highest level of protection.