Corrosion inhibitors for Fe2P structure magnetocaloric materials in water

US9887027B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Kerstin Schierle-Arndt · Zwingenberg, DE
• Fabian Seeler · Dossenheim, DE
• Markus SCHWIND · Ludwigshafen, DE
• Jerome Francois · Jarny, FR

Key dates

• Filing date: Sep 25, 2014
• Grant date: Feb 6, 2018
• Expiry date: Nov 10, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B30/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Use of a composition (A) having a pH of at least 8 at 25° C. containing at least 50 wt.-% of water or a water containing solvent mixture, at least 0.1 mol/m3 of at least one water soluble silicate, optionally at least one molybdate, optionally at least one phosphonate, optionally at least one azole, optionally at least one additional freezing point depressing salt, optionally at least one phosphate, and optionally at least one nitrate, as heat carrier medium for magnetocaloric materials of formula (I) (AyB1−y)2+uCwDxEz (I) where: A is Mn or Co, B is Fe, Cr or Ni, C is Ge, As or Si, D is different from C and is selected from P, B, Se, Ge, Ga, Si, Sn, N, As and Sb, E may be same or different from C and D and is selected from P, B, Se, Ge, Ga, Si, Sn, N, As and Sb.