Metal cleaning composition and process that do not damage...

Details Metal cleaning composition and process that do not damage... Metal cleaning composition and process that do not damage...

C - Chemistry, Metallurgy

11

D

C11D 3/06 (2006.01) C23G 1/02 (2006.01)

Patent

CA 2202041

An aqueous liquid composition containing dihydrogen phosphate salt, sulfur containing surfactant, and preferably a small amount of phosphoric acid cleans soiled metal surfaces without damaging plastic parts that come into contact with the composition and without supporting the growth of bacteria that cause unpleasant odors. The composition is particularly useful for cleaning unpainted aluminum sided rail transport cars that have polycarbonate housings insulating electrical contact points that provide motive electric power to the cars: many conventional aqueous alkaline and acid cleaners promote stress cracking of polycarbonate plastics.

Composition liquide aqueuse renfermant du diphosphate, un surfactif sulfuré, et de préférence une petite quantité d'acide phosphorique; la composition permet de nettoyer les surfaces métalliques souillées sans endommager les parties en plastique qui arrivent en contact avec la composition et sans favoriser la croissance de bactéries qui donnent une mauvaise odeur. La composition est particulièrement utile pour le nettoyage des wagons à parois en aluminium non peintes, qui sont munis de boîtiers en polycarbonate pour isoler les contacts électriques fournissant l'énergie électrique motrice aux wagons; de nombreux nettoyeurs aqueux classiques, acides ou alcalins, entraînent la fissuration des plastiques de type polycarbonate.

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