Microstructure and corrosion behaviour of laser-cladded γ-Ni/Mo₂Ni₃Si alloy coating

Abstract

Different γ-Ni/Mo 2 Ni 3 Si alloy coatings were fabricated on 0.45 wt-% C steel applying the DISTA300 semiconductor laser system. The microstructures, phase components and corrosion behaviour of the alloy coatings were investigated. Research results showed that lasercladded coatings with different compositions were all composed of ductile phase γ-Ni and reinforced phase Mo 2 Ni 3 Si. Electrochemical parameters and anodic polarisation curves revealed that the γ-Ni/Mo 2 Ni 3 Si alloy coatings exhibited a good corrosion performance in 3.5% NaCl solution in comparison with 0Cr18Ni9Ti stainless steel. The corrosion current density of the laser-cladded layer increased first and then decreased with the increasing volume fraction of Mo 2 Ni 3 Si. Moreover, the addition of Cr can significantly improve the passivation and anti-pitting ability of the γ-Ni/Mo 2 Ni 3 Si alloy coating.

Effect of aging on microstructure and wear resistance of Ti-55511/BN composite coating

“…Compared with electroplating process, laser cladding [7,8] is an efficient and environmentally friendly method to solve the problem, which can realize metallurgical bonding and synthesize ceramic reinforcing phase in situ to improve surface hardness and wear resistance. Among various ceramic phases, TiB [9] is relatively compatible with titanium alloy because its density, Poisson ratio, and thermal expansion coefficient are similar to that of titanium alloy, and it has high hardness and modulus.…”

Effect of PZT doping amount on microstructure and properties of Fe-based memory alloy composite coating by laser cladding

“…Because of its flexible process, laser cladding is often used to repair the surface of failed workpieces. Especially in the automotive and marine industries, the components of the engine and transmission systems often work in high-load environments, which are very prone to wear and corrosion [3,4]. Laser cladding technology can effectively solve the problem of ageing and replacement of such parts in the industry, which not only saves costs but also can effectively improve its mechanical properties [5,6].…”

Properties of Curved Parts Laser Cladding Based on Controlling Spot Size

“…At present, Fe-based [1][2][3], Ni-based [4,5], and Co-based [6,7] self-fluxing alloy powders are widely used to repair and strengthen the surface performance in laser cladding. The mechanical properties of coatings are analyzed through microhardness, wear resistance and microstructure properties, and the results shows that coatings can be equal to, or even superior to those of the alloys fabricated by die-casting or forging [8,9].…”