FIELD: chemical working of metals. SUBSTANCE: liquid for chemical polishing of niobium has, wt.-%: hydrofluoric acid (40%) 5.6-6.2; sulfuric acid (98% ) 56.3-46.9; nitric acid (69%) 25.2-25.7; carbamide 0.5-1.5, and water 20.8-21.3. EFFECT: enhanced quality of liquid. 4 tbl, 4 dwg
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