发明名称 |
Neuer zusammengesetzter chemischer Umwandlungsbeschichtungsfilm, mehrschichtiger Beschichtungsfilm unter Verwendung desselben und Verfahren zur Bildung des mehrschichtigen Beschichtungsfilms |
摘要 |
The present invention relates to a composite chemical conversion coating film containing a crystalline continuous coating film that is formed on a metal substrate. The present invention also relates to a process for forming a multiple layered coating film including (A) the first step of immersing an untreated metal substrate in an aqueous solution containing nitrate of a rare earth metal and forming a crystalline continuous coating film containing a rare earth metal compound with a deposition amount of 1 mg/m2 at lower limit and 110 mg/m2 at upper limit by cathode electrolysis and (B) the second step of coating an electrodeposition coating composition containing an organic acid or inorganic acid salt of a rare earth metal by cathode electrodeposition. According to the present invention, provided is a multiple layered coating film that forms extremely less amount of a composite chemical conversion coating film and an electrodeposition coating film in order in comparison with a pretreatment step and a cationic electrodeposition coating step by a conventional chemical coating solution and an electrodeposition coating composition; that is, a novel composite chemical conversion coating film with high economic efficiency and environmental conservation property is provided by expressing superior adhesion to a coating film and corrosion resistance equal to or more than a conventional step. |
申请公布号 |
DE112007000542(T5) |
申请公布日期 |
2009.02.12 |
申请号 |
DE20071100542T |
申请日期 |
2007.03.05 |
申请人 |
NIPPON PAINT CO. LTD.;TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
KANEKO, TOSHIO;OKAMOTO, SATOSHI;FUTSUHARA, MASANOBU;DOI, MAKOTO;OKADA, EISAKU |
分类号 |
C23C28/04;B05D3/10;C25D9/10;C25D13/10;C25D13/20 |
主分类号 |
C23C28/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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