Auto bodies consist of cold-rolled steel sheets, galvanized steel sheets, and aluminum steel sheets. The cleaning process for removing the oil content and metal powder adhering to the surface, and the chemical conversion treatment to impart coating film adhesion and corrosion resistance are performed before the electrodeposition coating process. 　The environmentally friendly chemical conversion treatment process uses an environmentally friendly chemical conversion treatment agent whose performance is equivalent to that of zinc phosphate (a generally used substance) and which is free from substances that adversely affect the environment, including heavy metals, such as nickel and manganese, and phosphorus compounds. Compared to zinc phosphate, this process does not require the surface preparation process, produces very little by-product (sludge) during the chemical reaction, and significantly reduces water consumption during treatment. It contributes to shortening the process and reducing water consumption and industrial waste.

From the viewpoint of environmental conservation, there has been a growing need for technology to reduce the environmental impact of the automotive surface treatment process. This technology contributes to significantly reducing industrial waste and cutting water consumption. We have been working to develop new surface treatment agents for auto bodies to achieve zero emissions.