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US 8,506,728 B2Granted
Surface treatment method of metal material
AssigneeMazda Motor Corporation
InventorsDaiji Katsura, Tsutomu Shigenaga
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AssigneeMazda Motor Corporation
InventorsDaiji Katsura, Tsutomu Shigenaga
Estimating the term…
In a process which is before a treatment process of forming a chemical conversion, TiO2 fine particles as an electron releasing-related substance (electron releasing substance) are attached onto a surface of a vehicle body. Then, a chemical conversion treatment is applied to the vehicle body having the TiO2 fine particles attached thereto. Thereby, an energy band gap of a finally-formed chemical conversion film can be smaller than that of a chemical conversion film formed by using only a chemical conversion treatment agent. Accordingly, the number of electrons (free electrons) which can be supplied onto the surface of a chemical conversion film can be increased during a voltage application in an electrodeposition coating process, and reducing reaction at a cathode can be promoted.
A surface treatment method of a metal material, comprising:
A surface treatment method of a metal material, comprising:
Dependencies are inferred from the claim text.