ZINC PHOSPHATE COATING
Phosphating is the most widely used metal pretreatment process for the surface treatment and finishing of ferrous and nonferrous metals. Due to its economy, speed of operation and ability to provide excellent corrosion resistance, wear resistance, adhesion, and lubrication properties, it plays a significant role in the automobile, process and appliance industries. Though known to be in use since late 1980s, the low temperature Zinc Phosphate systems have become more significant today due to the escalating energy costs.
Zinc phosphate coating gives base metal surfaces non-conductive and non-metallic properties. It also provides an excellent base for organic coatings such as paints, oils, lacquer and waxes. It is a low cost alternative to electroplating. Phosphate coating is generally specified in coating weight rather than coating thickness. The coating weight of phosphate coatings are in range of 6-8 gms/sq.ft. Phosphate coating provides excellent corrosion resistance and can withstand 1000 hours of salt spray test. Phosphate coating also reduces break-in wear on adjacent moving surfaces, improves torque-tension relationships and provides anti-galling and lubrication during cold forming processes such as deep-draw extrusions.
FINBON is designed to provide an ideal Zinc Phosphate coating on iron, steel and zinc surface. The system works ideal at room temperature within the range of 10°C to 40 °C. The zinc phosphate coating so developed provides a network of fibrous crystals. These crystals facilitate the excellent adhesion of paint to the base metal and inhibit corrosion development.
• FINBON provides adequate wear resistance due to the presence of heavy metal ions.
• It is an energy efficient process because system works ideally at 35 to 40c which reduces pre-treatment cost approximately 40-50% as compared to conventional Phosphating processes operating at higher temperature.
• The chemical consumption of FINBON is reported to be 40 to 50% less then the conventional phosphating chemicals working at higher temperature.
• It provides good corrosion resistance and excellent paint adhesion with the base metal.
• It is suitable for iron, steel and zinc substrate.
• It forms a small amount of sludge.
• FINBON coating develops a non-conducting bond between the base metal and the paint.
• FINBON can be used for both spray and immersion applications.
• It forms a chemically inert layer on metal surface which makes it suitable for electrophoretic lacquering.