Effect of nano-coating on corrosion behaviors of DCLL blanket channel

摘要

The corrosive behaviors of liquid metal fluid flow on the channel wall of Dual Coolant Liquid (DCLL) blanket of fusion reactor were simulated by imposing the discrete phase model (DPM) under different magnetic field strength, inlet velocities and neutron heat sources while considering blanket channel walls with and without non-wetting nanomaterial coating conditions. Results showed that regardless of the external environment of the blanket (except in the absence of magnetic field), the corrosion of the inner walls of the blanket channel declined significantly after employing nano-coatings in comparison to that of uncoated wall. For the uncoated condition, channel wall corrosion rate increased exponentially with time, various parameters have significant influence on channel corrosion, and the effect of magnetic field intensity is highest among them. In contrast, the corrosion rate of the channel walls with nanomaterial coating increased linearly with time, and unlike uncoated wall there is little difference on the corrosion rate of the channel walls for different parameters. Hence, these minute alterations in the corrosion of the channel walls with varying parameters indicate that the nanomaterial coating layer has a substantial protective effect on the blanket wall structure. (C) 2019 Elsevier Ltd. All rights reserved.