FIELD: electrochemistry. SUBSTANCE: article is anodized in nitric acid at voltstatic regime for two stages: firstly at the voltage 4-12 V and nitric acid concentration 5 M (not less), and then at the voltage 50-120 V and acid concentration 15 M (not less). At the second stage pulsating voltage is used with constant amplitude. EFFECT: improved method of working. 2 cl, 1 tbl
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