In order to remove the oil, rust, dust, etc. attached to the surface of the substrate used for continuous hot-dip galvanizing of strip steel and the production of color-coated plates, the formation is suitable for the requirements of continuous hot-dip galvanizing of strip steel and coating coil coatings. The substrate, in order to ensure that the hot-dip galvanized sheet and color-coated sheet, have good corrosion resistance and adhesion, and must be chemically treated before hot-dip galvanizing or coating materials. We call the chemical treatment agent used in the continuous hot-dip galvanizing and color-coated plate manufacturing process of this kind of strip steel special treatment agent for strip, referred to as strip treatment agent, which includes strip degreasing agent, strip conversion liquid, strip There are three major categories of passivating agents.