摘要:
Provided is a metal coated steel sheet having a coating layer including a metal having a level of Gibbs free energy equal to that of Fe or above and an oxide thereof. According to an aspect of the present invention, quality of a plated steel sheet may be improved by preventing the generation of bare spots through inhibition of the formation of Mn oxide, Si oxide, or Al oxide on the surface thereof, and simultaneously, the complexity of a manufacturing facility or an increase in manufacturing costs may be minimized. Thus, the present invention may be highly economic.
摘要:
There is provided a method of electroless gold plating, wherein the method includes a step of forming an underlying alloy layer on a base material and a step of forming a gold plate layer directly on the underlying alloy layer by means of electroless reduction plating using a cyanide-free gold plating bath, wherein the method is characterized in that the underlying alloy layer is formed of an M1-M2-M3 alloy (where M1 is at least one element selected from Ni, Fe, Co, Cu, Zn and Sn, M2 is at least one element selected from Pd, Re, Pt, Rh, Ag and Ru, and M3 is at least one element selected from P and B).
摘要:
The surface roughness of a copper sheet is adjusted to have an arithmetic mean roughness Ra of 0.5 µm or more and 4.0 µm or less in a direction parallel to a sliding direction upon connection, a mean projection-depression interval RSm of 0.01 mm or more and 0.3 mm or less in the direction, a skewness Rsk of less than 0, and a protrusion peak portion height Rpk of 1 µm or less. Further, as a surface coating layer, a Sn coating layer group X observed as a plurality of parallel lines is included, and a Cu-Sn alloy coating layer is present adjacent to each side of each of Sn coating layers constituting the Sn coating layer group X. The maximum height roughness Rz is 10 µm or less in a direction of part insertion. At the time of stamping the copper sheet, the copper sheet is surface-roughened by pressing, thereby forming depressions observed as a plurality of parallel lines in the surface of the copper sheet. The copper sheet is then plated with Cu and Sn, followed by reflowing to complete the production.
摘要:
The invention relates to a method for producing a carbon nanotube-, fullerene- and/or graphene-containing coating on a substrate, comprising the steps of applying carbon nanotubes, fullerenes and/or graphenes onto a tin-containing coating and introducing carbon nanotubes, fullerenes and/or graphenes into the coating by mechanical and/or thermal treatment. The invention further relates to the coated substrate produced by the method according to the invention and to the use of the coated substrate as an electromechanical component or leadframe.