摘要:
PROBLEM TO BE SOLVED: To provide a metallic foil for obtaining a laminate sheet for use in a lithium ion secondary battery, the laminate sheet being good in press formability, preventing a whitening phenomenon of a resin film layer in press forming, having excellent peeling resistance at a thermal fusion part when ear parts of a press molding are thermally fused with each other, and having strength higher than that of a laminate sheet prepared using an aluminum foil.SOLUTION: An austenitic stainless steel foil has: a composition having an Md value represented by the following formula (1) of 0.0-40.0; a thickness of 40-150 μm; an average number of crystal grains existing in the thickness direction of 5.0 pieces or more; and an average nitrogen concentration in a surface layer region from the surface to a depth of 2 nm of 5.0-9.5 mass%. Md value=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo...(1).
摘要:
PROBLEM TO BE SOLVED: To provide a means for preventing oxidation of a compound layer due to high-frequency hardening, the compound layer being formed on the surface of a steel material by nitriding. SOLUTION: Treatment liquid for forming a protective film for protecting a nitride on a nitride layer formed after the nitriding for the steel material contains at least one kind selected from the group consisting of Si, Ti, Zr, Hf, V, Ta, Ca, Ce, Sc, Nb, Cr, W, Al, Sr, Zn, Mg and Mo and contains 0.1 to 60 g/L of at least one kind of anion selected from the group consisting of phosphate ion, condensed phosphate ion, phosphite ion, fluoride ion, carbonate ion and silicate ion, wherein a pH of the treatment liquid is 4 to 14. COPYRIGHT: (C)2011,JPO&INPIT