Corrosion resistance of self-growing TiC coating on SIMP steel in LBE at 600 °C

Abstract

SIMP steel was newly developed as a candidate structural material for the accelerator driven subcritical system. The serious decarburization of SIMP steel because of the high Si content was used to successfully form a self-growing TiC coating on the surface, after the Ti deposition as a first step. This TiC layer can effectively protect the surface from the static liquid lead-bismuth eutectic (LBE) corrosion at 600 °C up to 2000 h in the low oxygen LBE.However, in the oxygen saturated LBE, the TiC coating is oxidized into porous TiO2 after only 500 h and fails to protect. Therefore, the self-growing TiC coating is desired only when the oxygen content of LBE is strictly controlled on a low level.

Electrochemical Sensors for Controlling Oxygen Content and Corrosion Processes in Lead-Bismuth Eutectic Coolant—State of the Art

“…All the principal industrial methods of surface films formation were used for coating structural materials. Among them were chemical and physical deposition from the gas phase (batch cementing, pulsed laser spraying, vacuum arc technology, thermal spraying), mechanical milling and so on [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. The main problem of the application of these coatings to inhibit corrosion of structural materials in the LBE environment was ensuring their sufficient mechanical strength and adhesion on the surface of the main alloy [ 27 ].…”

Effects of Y2O3 Addition on the Microstructure and Static Lead-Bismuth Eutectic Thermal Corrosion Behaviors of FeCrAlTiC-xY2O3 Laser Clade Coatings

“…When corrosion continues, TiC particles distributed in coatings are exposed to LBE, which leads to a different pattern of the corrosion mechanism (Figure 13a). Shi et al explained the probable oxidation reaction of TiC in the oxygen-saturated LBE as follows [52]:…”

A Review of Corrosion Behavior of Structural Steel in Liquid Lead–Bismuth Eutectic

“…TiC layers in low-oxygen LBE can effectively prevent LBE corrosion at 600 • C for as long as 2000 h [113]. Carbon-based coatings exhibit outstanding performance in terms of high resistance to corrosion, surface smoothness, and low friction index.…”