C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/28 (2006.01) C11D 1/00 (2006.01) C11D 3/00 (2006.01) C11D 3/34 (2006.01) C11D 3/36 (2006.01) C11D 11/00 (2006.01) C23G 1/06 (2006.01) C23G 1/08 (2006.01)
Patent
CA 2417580
Methods and compositions for controlling corrosion of high strength steels in the presence of a cleaning solution for removing iron oxide scale from metal surfaces. A benzotriazole or benzimidazole compound is added to a combination of ethoxylated mercaptan and/or oxidized ethoxylated mercaptan and 1- hydroxyethylidene-1,1-diphosphonic acid. The composition is added to an aqueous system, such as a steam generating system, to remove scale from the metal surfaces.
La présente invention concerne des procédés et des compositions permettant de maîtriser la corrosion d'aciers hautement résistants en présence d'une solution de nettoyage destinée à éliminer la pellicule d'oxyde de fer des surfaces métalliques. On ajoute un composé bezotriazole ou benzimidazole à une combinaison d'éthoxy mercaptan et/ou d'éthoxy mercaptan oxydé et d'acide 1-hydroxyethylidène-1,1-diphosphonique. On ajoute cette composition à un système aqueux, tel qu'un système générateur de flux, de façon à éliminer la pellicule des surfaces métalliques.
Meskers Donald A. Jr.
Tippett Roger J. A.
Betzdearborn Inc.
Craig Wilson And Company
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