Reference

Corrosion inhibitors for water-soluble heat transfer mediums

Corrosion inhibitors for water-soluble heat transfer mediums. Nemcova, Jitka; Strnadova, Vera; Lebl, Miroslav; Matejcek, Jiri (Czech. ). Czech. CS 213153 B 1 Feb 1984,3 pp. (Czech). (Czechoslovakia). CODEN: CZXXA9. CLASS: IC: C23F011-10. APPLICATION: CS 80-7034 17 Oct 1980. DOCUMENT TYPE: Patent CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Section cross-reference(s): 56 Corrosion inhibitors for protection of metals in alkanolamine mediums used in solar collectors are given. Thus, treating 1 kg medium contg. triethanolamine [102-71-6] 250, Na4 EDTA [64-02-8] 100, and water 650 g consecutively with water glass [1344-09-8] 2, 85% H3PO4 0.5, Na benzoate [532-32-1] 1, and 2-mercaptobenzothiazole [149-30-4] 1 g gave corrosion protection of 100, 82, 99.9, and 50%g for Cu, brass, Al, and cast iron, resp. 69-72-7 and 102-71-6 are just another two chemicals used in this study. .

Acicular magnetic iron powder

Acicular magnetic iron powder. (Nippon Soda Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58174509 A2 13 Oct 1983 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: B22F009-24; C01G049-06; H01F001-06. APPLICATION: JP 82-54975 2 Apr 1982. DOCUMENT TYPE: Patent CA Section: 54 (Extractive Metallurgy) Section cross-reference(s): 77 Granulated Fe2O3 particles coated with silicic acid (250-6 mesh) are obtained by heating and dehydrating acicular cryst. Fe oxide hydrate coated with silicic acid gel hydrate and redn. The method gives acicular magnetic Fe powder particles with satn. magnetization 3150 emu/g and coercive force 31400 Oe. Thus, a wet cake of goethite [1310-14-1] (axial ratio 10-20, length 1.0-1.5 m) contg. Ni 3.85 and Zn 1.20 at.% (per 100 Fe atoms) was dispersed in an aq. soln. of Na hexametaphosphate, and water glass [1344-09-8] was added to the mixt. with agitation. An aq. soln. contg. Na2HPO4 and KH2PO4 was added to the mixt., and the mixt. was filtered to give goethite coated with silicic acid gel hydrate. The goethite was heated to 350° and dehydrated, pulverized by a mill, granulated to give hematite [1317-60-8] particles (60-32 mesh), and reduced at 450° in H to give magnetic Fe powder having coercive force 1330 Oe, satn. 7439-89-6 and 1310-14-1 are just another two chemicals used in this study. magnetization 150.6 Oe, and squareness ratio sr/ss 0.507. .