It is the equipment to improve the corrosion resistance and coating adherence of coated materials forming film by the treatment with chemicals (zinc phosphate or iron phosphate group) after making activated metal surface by removing foreign substances before coating, since various processing oil, dust, rust and impurities used at the work processes of metal products adversely affect the adherence or drying of film surface and cause poor coating result. The processes are roughly divided into grease removing process and chemical coating process, and the composition of the detailed process can be different depending on the product type or quality. The detailed processes generally consist of “Boil washing – Preliminary grease removal – Main grease removal – Washing 1 – Washing 2 – Surface adjustment – Chemical coating – Washing 3 – Washing 4 – Pure washing”. It can be divided into 3 types such as SPRAY, SPRAY + DIP and DIP, depending on the treatment method.