| 摘要 |
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 DEG C. and a hydrotropic coupling agent preferably a combination of caprylic acid and capric acid.
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