A metallic decorative part for a vehicle display device includes a substrate body molded from a synthetic resin, a metal thin film that is formed of metal and deposited on a surface of the substrate body, and a plurality of grooves deposited on a surface of the metal thin film in accordance with a shape of the surface of the substrate body. The grooves are formed so that a width is larger than 0 and equal to or smaller than 3.0 m, and a height is larger than 0 and equal to or smaller than 1.0 m. Accordingly, the metallic decorative part for a vehicle display device can properly secure a metallic texture recognized by a viewer with a configuration in which the metal thin film is deposited on the surface of the substrate body made of resin.

A connecting component material used as a material constituting a connecting component , wherein the connecting component material is obtained by using a Ni-plated metal plate in which a Ni plating layer is formed on the surface of a metal plate, and the average depth (R) of a surface roughness motif in at least one direction on the surface of the Ni plating layer is 1.0 m or above, and by forming a Sn plating layer having a thickness of 0.3 to 5 m on the Ni plating layer of the Ni-plated metal plate; the connection component material makes it possible to reduce friction and minimize abrasion of the material when a connecting component such as an electrical connection terminal is fitted, and to improve the reliability of a stable electrical connection; and the connecting component material can be used in e.g., electrical contact components such as lead frames, harness plugs, and connectors used in electrical and electronic devices and the like.

An alloy member includes a substrate formed of an alloy containing Mg and Li, a first layer which is disposed on the substrate and contains an inorganic fluoride, and a second layer which is disposed on the first layer and includes a cured product of a resin, the substrate, the first layer, and the second layer being stacked together, in which a surface of the first layer on the side opposite the substrate has an irregular structure.

A surface-treated steel sheet of the present disclosure includes a steel sheet, and an alloy layer containing Ni and Co on a surface of the steel sheet. A surface roughness Ra1 of the surface of the alloy layer over a sampling length of 5.0 mm in the width direction of the steel sheet is 2.0 m or less. Ra2 that denotes the arithmetic mean height of a roughness curve of the surface of the alloy layer over a sampling length of 10 m in the width direction of the steel sheet is 20 nm or less, and RSm that denotes the mean length of roughness curve elements over the sampling length of 10 m in the width direction of the steel sheet is 700 nm or more, Ra2 and RSm being measured using an atomic force microscope.

There is provided a technique to strongly integrate a galvanized steel sheet and a resin molded article. A hot-dip galvanized steel sheet is immersed in an aqueous solution for aluminum degreasing to form a specific roughness on the surface. The surface is covered with convex protrusions having a diameter of about 100 nm, and a chromate treatment layer appears in the surface. A resin composition comprising 70 to 97 wt % of polyphenylene sulfide and 3 to 30 wt % of a polyolefin resin is injected onto the surface. The resin composition penetrates into ultra-fine irregularities and is cured in that state, and thereby a composite in which the galvanized steel sheet and the resin molded article are strongly integrated can be obtained. The shear rupture strength of the composite is extremely high.

A carrier-attached copper foil having good circuit formability is provided. The carrier-attached copper foil has a carrier, an intermediate layer and an ultra-thin copper layer in this order, the average grain size of crystal grains that form the ultra-thin copper layer is 1.05 to 6.5 m, and a ten point average roughness Rz of a surface on a side of the ultra-thin copper layer is 0.1 to 2.0 m.

Coated steel sheet used for hot stamping has a thin aluminium alloy coating with coating thickness of 514 m. The aluminium alloy coating has a FeAlSi inhibitive layer adjacent to a substrate steel sheet and an Al alloy layer outside the FeAlSi inhibitive layer. The thickness of the FeAlSi inhibitive layer is no more than 60% of the coating thickness and is 1.56.0 m. Diameters of Kirkendall voids within 2 m from an interface between the FeAlSi inhibitive layer and the substrate steel to the interior of the substrate steel are no more than 2.5 m, and the number of Kirkendall voids with a diameter of no less than 0.5 m and no more than 2.5 m does not exceed 15 per 35 m. The coating method eliminates skip coating and resulting hot stamped component has excellent resistance spot welding performance.

A surface-treated copper foil which maintains peel strength against the resin substrate of the surface-treated copper foil and achieves desired low transmission loss even at high frequencies includes an electrolytic copper foil, at least one roughened layer that covers one surface of the electrolytic copper foil, an anti-rust layer that covers the at least one roughened layer, and a silane coupling agent-treated layer that covers the anti-rust layer, in which a surface of the surface-treated copper foil on a side of the layers has a developed interfacial area ratio Sdr of 40% or less, an arithmetic mean peak curvature Spc of 200 mm-1 or less and a root mean square gradient Sdq of 0.30 to 0.90, or particles on the surface to be bonded of the surface-treated copper foil have an average particle size of 0.50 m or less and an average particle length of 0.40 to 0.70 m.