C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/48 (2006.01) C11D 1/04 (2006.01) C11D 3/02 (2006.01) C11D 3/26 (2006.01) C11D 3/30 (2006.01) C23C 22/68 (2006.01) C23G 1/02 (2006.01)
Patent
CA 2105135
-10- ABSTRACT OF THE DISCLOSURE A cleaning and passivation treatment for metal surfaces which is essentially phosphate free and resistant to foaming in soft water is disclosed. The treatment solution includes relatively water insoluble surfactants without the use of conventional hydrotropes. The treatment solution includes an aqueous solution of monoethanolamine, boric acid, a non-ionic surfactant having a cloud point below about 25°C and a hydrotropic coupling agent preferably a combination of caprylic acid and capric acid.
Betzdearborn Inc.
Borden Ladner Gervais Llp
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