FIELD: metallurgy.
SUBSTANCE: lower end of a processed part is sealed, an auxiliary electrode is placed into a part, and a salt melt is loaded to the level by 2.5-3.5 mm lower the upper end of the processed part. The part is heated up to 830-1190 K, anode polarisation is carried out with current having density from 0.1 to 25.0 A/dm2 in a salt melt, being an electrolyte, during 1.5-3.0 hr with an auxiliary electrode. After anode polarisation the salt melt is poured out, and the part is cooled down.
EFFECT: increased microhardness and higher thickness of a protective layer of an inner surface of hollow parts.
1 tbl, 1 ex
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