Methods for Increasing the Corrosion Resistance of Coatings Deposited under a Flux Layer from High-Chromium Powder Wires
- PDF / 1,034,763 Bytes
- 6 Pages / 594 x 792 pts Page_size
- 22 Downloads / 150 Views
METHODS FOR INCREASING THE CORROSION RESISTANCE OF COATINGS DEPOSITED UNDER A FLUX LAYER FROM HIGH-CHROMIUM POWDER WIRES Yu. М. Kuskov,1 V. А. Zhdanov,1 І. О. Ryabtsev,1 М. М. Student,2 and H. H. Veselivska2, 3
UDC 621.791.92
We propose to improve the corrosion resistance of the coatings deposited from PP-Np-30Kh20MN fluxcored wires under a flux layer by changing the procedure of preparation of the charge, by introducing modifying additions to the charge, and by the ultrasonic impact treatment of the deposited surface. It is shown that the influence of charge materials from the flux-cored wires refined by electroslag remelting on the analyzed characteristic is more pronounced. The corrosion resistance becomes higher as a result of the addition of a small amount of yttrium to the charge. The ultrasonic treatment of the deposited surface may improve the corrosion resistance of the metal but this problem requires additional investigations. Keywords: corrosion, surfacing, charge of a flux-cored wire, additions, ultradispersed particles, electroslag remelting, hardening of the deposited metal, plungers, rods.
Introduction In the mining production, plungers of the hydraulic props of mechanized cages are protected against abrasive wear by deposition of galvanic chromium. However, this method is ecologically unfriendly. This is why it is necessary to create new technologies that can replace this procedure. As alternative procedures of this kind, we can mention gas-flame and plasma spraying, electric-arc metallization, and surfacing from flux-cored wires (FCW) under a flux layer. The last method is quite simple and successfully passed through industrial tests. Moreover, it can be used not only for manufacturing new products but also for the renovation of worn-out working surfaces containing remnants of chromium coatings (Fig. 1) [1–3]. However, in the course of deposition of wear-resistant layers from flux-cored wires (FCW), we observe the formation of a chromium coating characterized by an inhomogeneous distribution of the chromium content. Note that corrosion is localized at the sites where the chromium content is lower than 12 wt.%. To improve the corrosion resistance of these layers, we propose the following measures: — to control the size of particles of charge materials and their quality by introducing modifying additions in the composition of the charge in order to get a charge of the FCW some components of which 1 2 3
E. Paton Institute of Electric Welding, Ukrainian National Academy of Sciences, Kyiv, Ukraine.
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 55, No. 5, pp. 90–95, September–October, 2019. Original article submitted June 20, 2019. 710
1068-820X/20/5505–0710
© 2020
Springer Science+Business Media, LLC
METHODS FOR INCREASING THE CORROSION RESISTANCE OF COATINGS DEPOSITED UNDER A FLUX LAYER
711
Fig. 1. Corrosion defects on the surface of
Data Loading...
