NiCr Alloy Coating Deposited on the Surface of 35CrMo Steel by the Electrospark Process

Abstract

Strengthened coating on the surface of 35CrMo steel alloy was deposited by electrospark process using NiCr electrode. The bond strength and microhardness of the coating was checked and the microstructure of the strengthened coating was analyzed using the optical micro-scope, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectrum (EDS). The results show that the bond strength between the coating and the base metal is 495.1MPa, and the hardness of the coating surface is about 2 times than that of the base metal, and the property of the workpieces surface has become better. The coating is a metallurgical reacting bonding layer between the base metal and the NiCr electrode, and its main ingredients are FeNi and NiCrFe.

Synthesis, Wear and Corrosion of Novel Electrospark and Electrospark–Electrochemical Hybrid Coatings Based on Carbon Steels

“…Such types of hybrid coatings have not been investigated previously. The ESD coatings were obtained by ESD using the following electrodes: (i) a conventional T15K6 hard metal, because it exhibited a good set of mechanical properties, which predetermine the prospects for its practical application in manufacturing cutting and stamping tools, operating under dynamic conditions [18]; (ii) a CuNiZn alloy obtained by the magnetron sputtering process demonstrated reasonable corrosion resistance [19], (iii) Ni-Cr because of the bond strength between the coating and the base metal [20], and high resistance to gas corrosion [21] (iv) pure Ni deposited by EDS for comparison with electrochemically deposited Ni; (v) electrodes of steel 45, steel 20 and steel 3 were used because of the low price of these materials.…”

Kinetics of deposition, structure, and properties of Cr–Al–Si–B electric-discharge coatings on refractory nickel alloy

“…Одним из перспективных методов осаждения покрытий является электроискровое легирование (ЭИЛ) [3][4][5][6][7][8][9][10][11][12][13], которое находит применение для защиты от окисления никелевых сплавов [14,15]. К достоинствам ЭИЛ-покрытий относятся высокая адгезия, возможность локальной обработки поверхности, в том числе крупногабаритных изделий, относительная простота реализации, отсутствие жестких требований к подготовке поверхности перед нанесением, высокая надежность оборудования [3,16,17].…”