| 摘要 |
This invention provides an organic multicoated steel sheet susceptible to cationic electrodeposition coating which comprises a zinc or zinc alloy plated steel sheet and as a first layer provided on the surface of said plated steel sheet a sparely soluble chromate film of 1 - 30% in water soluble matter, 0.01 - 1.0 in Cr6+/ Cr3 ratio and 10 - 150 mg/m2 in total chromium application amount on one surface and as a second layer provided said first layer a solid film having a thickness of 0.3 5 .mu.m of a solvent type coating composition having the following composition based on the weight of non-volatile matter: (a) 30 - 90 weight % of an urethanated epoxy ester resin having a number-average molecular weight of 300 - 100,000, (b) 5 - 40 weight % of a hydrophilic polyamide resin having a polymerization degree of 50 - 1,000 (c) 5 - 40 weight % of a silica particle of 1 - 100 m.mu. in average particle size and (d) 1 - 20 weight % of a lubricant having a molecular molecular weight of 1,000 - 10,000. |
