銀合金の耐變色抵抗性について(第1報)
1949 年 13 巻 5 号 p. 40-42
詳細
1949 年 13 巻 5 号 p. 40-42
Effects of small quantities of various addition elements on the tarnish-resisting properties of silver-bane alloys were researched by examining the degree of tarnishing produced when immersed in 0.1 N-Na2S aq. solution. The invisible films formed by heating these alloys in air or in controlled atmospheres of low pressure were found to be highly protective against tarnishing. Good result wereobtained from binary silver alloys containing zinc, probably because of that the zinc in the alloy forms the type of oxide film in which cations are present in excass.
