| 摘要 |
Metal cleaning formulation for the preparation of low temperature-low foam aqueous metal cleaning and polishing baths. The formulation includes an alkaline builder consisting of sodium metasilicate together with sodium hydroxide, sodium carbonate, or mixtures thereof. The system includes sodium gluconate, the tetrasodium salt of ethylenediaminetetraacetic acid, kerosine, and a biodegradable wetting agent system. The wetting agent system utilizes a mixture of linear primary alcohol polyethers and a linear alcohol alkoxylate, with the linear primary alcohol polyethers having cloud points of about 40 DEG C. and 26 DEG C. respectively, and with the linear alcohol alkoxylate having a cloud point of about 20 DEG C. The formulation is free of either poly or orthophosphates.
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