Abstract: A resin film according to one aspect of the present invention is a resin film having polyimide as a main component, the resin film including a modified layer formed in a depth direction from at least one side of the resin film; and a non-modified layer other than the modified layer, wherein a ring-opening rate of an imide ring of the polyimide in the modified layer is higher than a ring-opening rate of an imide ring of the polyimide in the non-modified layer, and an average thickness of the modified layer from the one side of the resin film is greater than or equal to 10 nm and less than or equal to 500 nm.

Abstract: A resin film according to one aspect of the present invention is a resin film having polyimide as a main component, the resin film including a modified layer formed in a depth direction from at least one side of the resin film; and a non-modified layer other than the modified layer, wherein a ring-opening rate of an imide ring of the polyimide in the modified layer is higher than a ring-opening rate of an imide ring of the polyimide in the non-modified layer, and an average thickness of the modified layer from the one side of the resin film is greater than or equal to 10 nm and less than or equal to 500 nm.

Abstract: A magnesium alloy material having high corrosion resistance is provided. The magnesium alloy material contains a magnesium alloy containing 7.3% to 16% by mass Al, wherein a region having an Al content of 0.8x % by mass or more and 1.2x % by mass or less occupies 50% by area or more, a region having an Al content of 1.4x % by mass or more occupies 17.5% by area or less, wherein x % by mass denotes the Al content of the entire magnesium alloy material, and there is substantially no region having an Al content of 4.2% by mass or less. The magnesium alloy material has small variations in Al concentration and includes a few regions having a very low Al content, thereby effectively preventing and retarding local corrosion. Thus, the magnesium alloy material has higher corrosion resistance than die-cast components having the same Al content.