Structure and Properties of Al – Ni – Fe Coatings on Steel 35 Obtained by Electrospark Deposition

Abstract

Al – Ni – Fe coatings on steel 35 deposited by the electrospark method using a non-localized electrode and mixtures of nickel and aluminum granules are studied. The kinetics of the mass transfer of mixtures of granules of three compositions during application of the coatings is investigated. The phase composition, the microstructure and the hardness of the coatings are determined. Corrosion and wear tests are carried out. It is shown that the deposition of Al – Ni – Fe coatings on the steel can reduce its susceptibility to spontaneous corrosion, lower the corrosion current density by a factor of 1.6 – 2.6, raise the wear resistance by a factor of 3.7 – 6.2 and elevate the heat resistance.