DOI: 10.14489/hb.2014.11.pp.029-031

Гасий А. Б.
КАВИТАЦИОННО-ЭРОЗИОННАЯ СТОЙКОСТЬ И КОРРОЗИОННО-МЕХАНИЧЕСКАЯ ПРОЧНОСТЬ ВАКУУМНЫХ ИОННО-ПЛАЗМЕННЫХ ПОКРЫТИЙ
(с. 29-31)

Аннотация. Приведены результаты исследований кавитационно-эрозионной стойкости и коррозионно-механической прочности стали 45 с одно- и двухслойными вакуумными ионно-плазменными покрытиями на основе Ті, Nі, Мо.

Ключевые слова: кавитационно-эрозионная стойкость; коррозионно-механическая прочность; вакуумные ионно-плазменные покрытия; рабочая среда.

Hasiy O. B.
CAVITATION-EROSION RESISTANCE AND CORROSION-MECHANICAL STRENGTH OF VACUUM ION-PLASMA COATINGS
(pp. 29-31)

Abstract. The article presents the results of investigations of cavitation-erosion resistance and corrosion-mechanical strength of steel 45 with single-and double-layer vacuum ion-plasma coatings based оп Ti, Ni, Мо. Operating parameters of coating deposition as follows: arc current 70…200 А; reactive gas – nitrogen; gas pressure – 0.4…0.5 Ра; voltage – 150…200 V; substrate temperature – 350…450 °C; coating thick-ness – 4…7 mm. Comparative studies of cavitation-erosion resistance of the test piece of normalized steel with TiN coating with pieces of normalized and hardened uncoated steel showed that TiN coating increases the resistance of steel bу 30…60 % in distilled water, 2.5…2 times in tap water, 6.5…8 times in 3 % aqueous solution of NaCl (рН 6.8). Resistance of more ductile Ti–Ni–N and Mo–Ni–N coatings 1.3…3 times less than the ТiN coating. The use of two-layer coatings, such as TiN + (TiN + Ni), Mo–N + (Mo–Ni–N), allows to achieve the highest cavitation-erosion resistance (2.5…3.5 times than the TiN coating). The outer layer of such condensates has high strength and good corrosion resistance, the lower layer prevents the deflection of the top layer. Boundary of corrosion fatigue in the 3 % NaCl solution of medium-carbon steel coated ТiN increased twice.

Keywords: Cavitation-erosion resistance; Corrosion-mechanical strength; Vacuum ion-plasma coatings; Working fluid.