Organic/Inorganic Hybrid as an Anticratering Agent in Cathodic Electrocoating

Many surface defects may appear in electrophoretic coatings. One of the most important defects in automotive coatings is cratering. An improved aqueous electrocoating composition containing an anticrater additive which is a reaction product of silane component based on glycidoxy propyl trimethoxysilane and polyoxypropylene diamine. The synthesized compound is used to reduce crater numbers in the final electrocoated car bodies. Prepared samples were characterized using infrared spectroscopy and optical microscopy. The number of craters in the electrocoated sample was evaluated by GM9532p standard. The final anticrater-containing electrocoat produced coating with a smoother surface and fewer craters.