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Effects of metal-ceramic anticorrosion coating on the performance of ballastless tracks at high temperature

Zhang Jiwen, Jiang Hailou, Ding Feng, Zhang Pingze, Zhou Fei, Li Tao, Duan Ning

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 4

329--342

A highly reflective metal-ceramic anticorrosion coating is proposed to address temperature-induced track arching and concomitant damage of the China Railway Track System II ballastless tracks. The term ceramic refers to the inorganic phosphate coating binder and the metal pertains to the aluminite powder filler. Its thermal properties were studied through finite element modeling and heat radiation testing of uncoated and coated concrete samples and 1:1 ballastless track slab models. The metal–ceramic anticorrosion coating microstructure and constituent characterization were considered in its cooling efficacy analysis. The insulation temperature of the concrete test pieces increased as the thickness of the primer layer increased. At a primer layer thickness of 100 μm, 200 μm, and 300 μm, the corresponding insulation temperature was 8 °C, 18 °C, and 25 °C, respectively. Moreover, the temperature gradient, longitudinal stress, and vertical displacement of a track slab coated with a 300-μm metal-ceramic anticorrosion coating layer decreased by 29%, 57%, and 51.9%, respectively, which agreed well with the simulation results. The reduction in temperature transfer to the substrate, realized by the metal-ceramic anticorrosion coating, holds great promise for application in the construction industry.

Odporność korozyjna wybranych powłok nakładanych metodą tamponową

Grześ J.

Przegląd Spawalnictwa

2014

R. 86, nr 2

14--18

W artykule przedstawiono wyniki badań korozyjnych wybranych powłok nakładanych metodą tamponową. Przedmiotem badań były powłoki metalowe (Ni, Cu+Ni) i powłoki kompozytowe metalowo-ceramiczne (Cu+Si3N4, NiW+Si3N4). Badania odporności na korozję wykonano metodą potencjodynamiczną w 0,5M NaCl. Przedstawiono również wyniki badań metalograficznych i pomiarów mikrotwardości.

The paper presents the results of the corrosion resistance investigation of selected coatings deposited by the brush plating method. The metal (Ni, Cu+Ni) and composite metal-ceramic composite (Cu+Si3N4, NiW+Si3N4) coatings have been produced in the frame of conducted research. The investigation of corrosion resistance has been performed using the potentiodynamic method in the 0.5M solution of NaCl. The results of microhardness measurements and microscopic investigation of the surface and cross-section of the coating have been also included.