Reference

Prevention of tarnishing on silver or its alloy products

Prevention of tarnishing on silver or its alloy products. Kawana, Yasuo; Ara, Takeo (Alps Electric Co., Ltd., Japan). Japan. Kokai JP 52111430 19 Sep 1977 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C23F007-00. APPLICATION: JP 76-27793 15 Mar 1976. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Section cross-reference(s): 76 A mixt. contg. mercapto compd., alk. compd., alc., and organotin laurate, e.g., Bu2Sn dilaurate, is used to prevent tarnish on Ag, and stabilizes elec. contact resistance. Thus, the mixt. contained lauryl mercaptan [112-55-0] 2.0, cetyl mercaptan [2917-26-2] 0.5, 2-naphthalenethiol [91-60-1] 0.1, benzotriazole [95-14-7] 0.1, dioctyltin dilaurate [3648-18-8] 1.0, polyoxyethylene alkyl ether 1.0, polyoxyethylene alkyl ester 1.0, 28% NH4OH soln. 20, EtOH 10, and water 64.3%. The tarnish rating ofg Ag with the coating was ~1 after exposing 60 h to a H2S-NH3 atm. vs. ~10 after treatment 25 h with a com. mixt.

Heat-storage apparatus

Heat-storage apparatus. (Matsushita Electric Industrial Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59230086 A2 24 Dec 1984 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C09K005-06. ICS: F28F023-02. APPLICATION: JP 83-105160 13 Jun 1983. DOCUMENT TYPE: Patent CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Section cross-reference(s): 56 The title app. consists of a heat-storage material (mainly NaOAc.3H2O [6131-90-4]) and a heat-transfer material (mainly a fluorocarbon) either contg. cetylmercaptan [2917-26-2] and/or dodecylmercaptan [112-55-0] as rust inhibitor. The addn. of mercaptan(s) prevents the corrosion of Cu and enables to use Cu as the app. material. Thus, a piece of Cu placed into a mixt. of NaOAc.3H2O, Cl2CFCClF2 [76-13-1], and cetylmercaptan lost ￡0.01 mg/cm2 wt. after 30 days, vs. 0.4 mg/cm2 for a compn. without cetylmercaptan.