Abstract: The object of the present invention is to provide a silver plated and/or a silver alloy plated article with high productivity, high reflectance in the visible light range, and excellent sulfidizing resistance. The present invention provides a silver electroplated and/or silver alloy electroplated article having an oxidation layer on its surface, wherein a silver plating layer and/or silver alloy plating layer is formed on a substrate by silver electroplating and/or silver alloy electroplating, and then subjected to oxidation treatment to form an oxidation layer on the surface thereof. The thickness of the oxidation layer formed on the surface of the plating layer is 0.05 ?m or more.

Abstract: A method of forming a damping plate from a fiberglass reinforced plastic base plate and a layer of cushioning material by utilizing a restrainer plate on the other side of the layer of cushioning material from the base plate and which is thinner than the base plate and no thicker than the layer of cushioning material. The cushioning material is formed with a plurality of openings so as to afford flow of liquid adhesive into the openings to assure uniform distribution and good bonding during assembly. The plate may be employed as a portion of a hull of a watercraft for sound deadening.