B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/159, 204/17,
B32B 15/01 (2006.01) C23C 2/28 (2006.01) C23C 28/02 (2006.01) C25D 5/10 (2006.01) C25D 5/26 (2006.01) C25D 5/50 (2006.01)
Patent
CA 2030812
ABSTRACT The present invention relates to high corrosion resistant multi-layer coated steel sheets having excellent paintability, as corrosion resistant steel sheets especially suitable to automobiles, and relates to a producing method thereof. The inventive steel sheet is a multi-layer coated steel plate having, on the surface thereof, a coated film based on Zn or Zn alloys of coating weight being not less than 25 g/m2 including at least coatings based on Zn alloys or composite coatings based on Zn or Zn alloys, and on said coated film, a coated film based on Fe' or Fe alloys of coating weight being 1 to 10 g/m' including at least Fe coating or the coatings based on Fe alloys of not less than 50% Fe, and wherein a hydrogen absorption amount in total in the coated film and in the steel is limited to be not more than 300 m /m2 (per one surface). Such a multi-layer coated steel plates has excellent paintability because they can prevent the generation of craters during electropainting and the occurrence of bubble-like paint defects concurrently, and have also corrosion resistance of high degree. Further a producing method of the present invention forms said multi-layer coatings on the steel sheets ! and carries out heating-treatment of the multi-layer coated steel sheets at a temperature of 100 to 400°C so as to produce the coated steel sheets of the above mentioned properties.
Bessho Takeshi
Fukada Arata
Kurata Masayuki
Miwa Hiroshi
Osaki Yasunori
Nkk Corporation
Swabey Ogilvy Renault
Toyota Jidosha Kabushiki Kaisha
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