| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a galvanized steel sheet having excellent press-forming property. <P>SOLUTION: The steel sheet has a coating having an average film thickness of 10 nm to 2,000 nm and containing crystalline lamellar material on the surface of the sheet. The crystalline lamellar material is, for example, a lamellar double hydroxide expressed by [M<SP>2+</SP><SB>1-x</SB>M<SP>3+</SP><SB>x</SB>(OH)<SB>2</SB>][A<SP>n-</SP>]<SB>x/n</SB>zH<SB>2</SB>O, wherein preferably M<SP>2+</SP>represents at least one of Mg<SP>2+</SP>, Ca<SP>2+</SP>, Fe<SP>2+</SP>, Ni<SP>2+</SP>and Zn<SP>2+</SP>; M<SP>3+</SP>represents at least one of Al<SP>3+</SP>, Fe<SP>3+</SP>and Cr<SP>3+</SP>; and A<SP>n-</SP>represents at least one of CO<SB>3</SB><SP>2-</SP>, Cl<SP>-</SP>and (SO<SB>4</SB>)<SP>2-</SP>. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
