Corrosion Resistance of the Coating of the Frame of an Agricultural Sprayer Boom

We present the results of impedance testing of the protective coating of the bar frame of an agricultural sprayer with thermoplastic powder paints under the operating conditions. The accumulated results confirm high quality and durability of the coating. However, due to the presence of mechanical defects, penetration of liquid working media or chemical destruction, through defects may appear in the coating. As a result, the access of water, oxygen, and corrosive ions to the metal surface is significantly simplified. At the site of defect, we observe the development of local corrosion, and the barrier properties of the coating deteriorate.