C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 5/00 (2006.01) C09K 5/20 (2006.01) C09K 15/02 (2006.01) C09K 15/30 (2006.01) C23F 11/08 (2006.01) C23F 11/18 (2006.01)
Patent
CA 2300893
The invention relates to low-viscosity, aqueous refrigerating brines based on alkali metal acetates and/or formates with improved corrosion control. Said refrigerating brines are characterized in that they contain 0.2-5 wt.% alkali metal sulfites or pyrosulfites, in particular 1-2.5 wt.% of these sulfites. The inventive brines contain in addition: 0.3-5 wt.% alkaline substances from the alkali carbonate, hydroxide, borate and phosphate groups, as well as 0-0.3 wt.% alkali silicate and 0.02-0.2 wt.% stabilizers from the triazole, benzimidazole and/or mercaptothiazole groups. The novel refrigerating brines have very low corrosion rates, in particular in the case of steel and cast iron.
L'invention concerne des sols réfrigérants aqueux de faible viscosité, à base d'acétates et/ou de formiates de métaux alcalins inhibés, à propriétés anticorrosion améliorées, caractérisés en ce que les sols réfrigérants renferment 0,2 à 5 % en poids de sulfites ou de pyrosulfite de métaux alcalins, en particulier 1 à 2,5 % de ce sulfite. Les sols selon l'invention renferment en outre 0,3 à 5 % en poids de substances basiques appartenant au groupe des carbonates, hydroxydes, borates et phosphates alcalins, ainsi que 0 à 0,3 % en poids de silicates alcalins et 0,02 à 0,2 % en poids de stabilisants du groupe triazole, benzimidazole et/ou mercaptothiazole. Les nouveaux sols réfrigérants ont de très faibles vitesses de corrosion, notamment pour l'acier et la fonte.
Minks Peter
Schuster Johann
Clariant Gmbh
Fetherstonhaugh & Co.
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