초록 ▼

It is an object of the present invention to provide a pretreatment method for coating, which does not limit a coating method, places a less burden on the environment and can apply good chemical conversion treatment to all metals such as iron, zinc, aluminum and so on.A pretreatment method for coatin

It is an object of the present invention to provide a pretreatment method for coating, which does not limit a coating method, places a less burden on the environment and can apply good chemical conversion treatment to all metals such as iron, zinc, aluminum and so on.A pretreatment method for coating comprising treating a substance to be treated by a chemical conversion coating agent to form a chemical conversion coat,wherein the chemical conversion coating agent comprises: at least one kind selected from the group consisting of zirconium, titanium and hafnium; fluorine; and at least one kind selected from the group consisting of amino group-containing silane coupling agents, hydrolysates thereof and polymers thereof.

대표청구항 ▼

The invention claimed is: 1. A cation electrodeposition method which comprises conducting surface treatment on a metal material for automobile body and automobile parts by a chemical conversion coating agent to form a chemical conversion coat, then washing the metal material with water without dryin

The invention claimed is: 1. A cation electrodeposition method which comprises conducting surface treatment on a metal material for automobile body and automobile parts by a chemical conversion coating agent to form a chemical conversion coat, then washing the metal material with water without drying, which is coated with the chemical conversion coat, and then conducting cation electrodeposition coating on the chemical conversion coat,wherein the chemical conversion coating agent comprises: at least one member selected from the group consisting of zirconium, titanium and hafnium having a content of 50 to 2000 ppm on the basis of metal; and fluorine; and at least one member selected from the group consisting of amino group-containing silane coupling agent, hydrolysates thereof and polymers thereof; and having substantially no phosphate ion,said at least one member is selected from the group consisting of amino group containing silane coupling agent, hydrolysates thereof and polymers thereof, has a content of 50 to 500 ppm as a concentration of solid matter,said chemical conversion coating agent has a pH of 1.5 to 6.5, andsaid metal material comprises at least iron material.