Over the last two decades, significant advancements have been made in electrophoretic coating technology, leading to notable improvements in both anodic and cathodic electrophoretic coatings. This progress has been particularly evident in the development and refinement of anodic electrophoretic coatings, which have evolved through several generations.
The first-generation anodic electrophoretic coatings were characterized by their low voltage settings, limited throwing power, and relatively poor salt spray resistance, typically under 100 hours. These coatings were primarily used for interior automotive applications and often required the assistance of a high-tech cathode. Materials such as maleic anhydride oil-phenolic aldehyde and epoxy ester, developed in the 1960s, formed the backbone of these coatings. Key parameters included a film thickness ranging from 18 to 20 micrometers, a pH level between 8 and 9, a construction voltage of 20 to 40 volts, and a throwing power (as measured by the steel tube method) of approximately 10%. Salt spray resistance was limited, lasting only up to 24 hours on phosphated steel plates, extending to 48 hours when applied post-phosphating.
Moving into the second generation, there was a marked improvement with higher voltages and enhanced throwing power. The introduction of polybutadiene resin-based anodic electrophoretic coatings in the 1970s marked a significant leap forward. These coatings demonstrated a substantial increase in salt spray resistance, reaching over 240 hours on phosphated steel plates, along with a throwing power exceeding 17%. Construction voltages were also boosted, rising to the range of 100 to 180 volts.
By the early 1990s, the third generation of anodic electrophoretic coatings emerged, showcasing even greater durability under high humidity and heat conditions. These coatings could serve as both primer and topcoat finishes. Notable examples include the domestically developed B11 acrylic air-through anodic electrophoretic paint and the D2035 anodic electrophoretic paint, which was manufactured using a formula introduced by Helan AKZO. These advanced coatings offered superior performance and reliability, marking a new era in electrophoretic coating technology.
In summary, the evolution of anodic electrophoretic coatings has been driven by continuous innovation, resulting in increasingly robust and versatile products that meet modern industrial demands.
Dc Vfm Rotor Production Line,Automatic Motor Rotor Production Line,Automatic Rotor Production Line,Adhesive Rotor Production Line
Suzhou Mountain Industrial Control Equipment Co., Ltd , https://www.szmountain.com