Effect of Mo Content on the Corrosion Resistance of Fe-Based Amorphous Composite Coating

Abstract

A Fe-based amorphous composite coating doped by molybdenum was fabricated by the pulse laser cladding technology. The substrate was a low carbon steel plate. The nominal composition of the powder in the range from 100 to 200 meshes was (wt.%) Cr:14.95, Mo:25.7, B:1.24, C:3.45, Y:3.40, Fe:51.29, which was selected for the laser cladding process. The microstructure, phase composition, hardness and corrosion resistance of the coatings were characterized by means of SEM, EDS, XRD , DSC and potentiodynamic polarization test. The results show that the coating which was composed of amorphous and nanocrystal phases had the dense structure and metallurgical bonding with the substrate, meanwhile with low porosity and cracks. The addition of molybdenum played an important role in improving the corrosion resistance of the coatings. With the increasing content of molybdenum, the hardness had no significant change, while the corrosion resistance of the coatings significantly increased. From the results of polarization curves, the corrosion current density of the coating added 0 wt.% Mo is higher than that of the coatings added 2 wt.% Mo and 10 wt.% Mo. The molybdenum has a superior effect on the corrosion resistance in Fe-based amorphous composite coating.

Effect of Mo on wear resistance of Stellite31 cladding layer

“…Xiong et al 19 added different contents of Mo elements to the high C content of Ni-based alloy powder and found that with the increase of added Mo content, the higher the Mo2C hard phase content in the coating, effectively improving the wear resistance of Ni-based alloy. In studying the wear resistance of iron-based amorphous composite coatings, Jiang 20 proposes that the addition of a certain content of Mo is more conducive to the formation of amorphous, resulting in more amorphous/nanocrystalline composite structures, which has a great impact on the improvement of the wear resistance of the coatings. However, no studies have been reported on improving the wear resistance of Stellite alloy coatings at room temperature service by using this method.…”

Effect of the Molybdenum Content on Wear and Corrosion Behavior of Fe-B-Based Surface-Alloyed Layer

“…There are various studies in the literature where molybdenum is used as a coating material [23,24]. In these studies, it is generally seen that the wear or corrosion properties on the surface are improved after hardfacing [25][26][27][28][29]. On the other hand, some studies have reported that molybdenum increases corrosion resistance in the presence of an element such as chromium or nickel, but its effect alone is still ambiguous [30,31].…”