FIELD: chemical treatment of metallic materials, namely protection of inner surface of elongated metallic tubes against corrosion.
SUBSTANCE: process comprises steps of keeping treated surface in circulating medium of oxidizing agent; filling tubes with oxidizing agent solution enriched with atomic oxygen; during keeping stage passing alternating current through tubes.
EFFECT: passivation of inner surface of metallic elongated tubes or main pipelines in assembled state.
2 dwg, 1 ex
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