腕時計用ルテニウムケース

概要

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Stainless steel case and precious - metal covered cases have been widely adopted as watch cases. Both cases have a high quality of corrosion resistance in common, however, they are readily scrached due to relatively low surface hardness, thus leaving somewhat to be improved. We, authors, have noticed Ruthenium which meets our objective to improve the surface hardness and have succeeeded in both the development and quantity productlon of oue new watch case wlth the brand name of "Miracle Hard Case" in which its performance as well as aestetic appearance have been upgraded by means of the electrodeposition of Ruthenium. The Miracle Hard Case resembles hard alloy cases in color tone and it has ex-cellent wear -resistance, i.e., 4 to 5 times as much as gold plated case. Furthermore, it also offers excellent corrosion resistance. Designing is restricted for the hard alloy cases while the Miracle Hard Case can provide vefsatile case designs since it can use easy-to-process base metal. Ruthenium electrolyte is mainly composed of the complex featuring Ru-N bond-ing and lt exhibits excellent cathode efficiency although its electrochemtal behavior is complicated. This paper reviews properties of Ruthenium, characteristics of its electrolyte, and the quality of Ruthenium plated watch case, respectively.
1976-09-15