Stainless steel alkali treatment

Details Stainless steel alkali treatment Stainless steel alkali treatment

C - Chemistry, Metallurgy

23

G

C23G 1/14 (2006.01) C23C 22/62 (2006.01) C23G 1/19 (2006.01)

Patent

CA 2200615

The invention includes a method for cleaning and passivating a stainless steel surface comprising: 1) contacting the surface with 15-45 ml/liter of a composition comprising between about 15 and 50 % alkaline component, between about 1 to 15 % chelant, and between about 35 to 84 % water; 2) maintaining contact to dislodge and remove residue from the surface; 3) continuing contact to complex free iron ions liberated from the surface with the chelant to form an oxide film on the surface; and 4) continuing contact to precipitate the complexed ions into the oxide film. The compositions may further include a surfactant selected from the group consisting of anionic, cationic, nonionic and zwitterionic surfactants to enhance cleaning performance.

L'invention porte sur un procédé de nettoyage et de passivation d'une surface en acier inoxydable consistant: (1) à mettre la surface en contact avec 15/45 ml/l d'une composition comprenant entre environ 15 et 50 % d'un constituant alcalin, entre environ 1 et 15 % d'un chélateur et environ 35 et 84 % d'eau; (2) à maintenir le contact de façon à déloger et éliminer les résidus de la surface; (3) à maintenir le contact pour complexer les ions fer libres libérés de la surface avec le chélateur pour former une couche mince d'oxyde sur la surface; et (4) à maintenir le contact pour précipiter les ions complexés dans une couche mince d'oxyde. La composition peut en outre comporter un tensioactif choisi parmi des tensioactifs anioniques, cationiques, non ioniques ou zwitterioniques de façon à améliorer les performances de nettoyage.

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