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Corrosion Behavior of Metallic Alloys in a Molten Chloride Eutectic Salt for Nuclear Applications

The rising demand for energy is creating an urgent need to develop a method of energy production that is sustainable cost-efficient and a clean alternative to traditional fossil fuel processes. Nuclear power is an option that has the potential to resolve these issues. Coolants in a nuclear reactor must possess certain qualities such as high volumetric heat capacity high boiling point low vapor pressure resistance to radiation and thermodynamic stability. In recent years there has been an increased interest in molten salts as replacements for water. Despite the potential for increased corrosion rates in the containment vessel molten salts minimize the risk of explosions because they do not need to be pressurized. Fluoride salts are the preferred candidates for a coolant material but the associated expenses and safety hazards make them unattractive for prolonged utilization. Chloride salts offer a safer and more cost-effective alternative but can be highly corrosive. Therefore careful consideration is required in the material selection process of the containment vessel. In this project two stainless steels (UNS S31600 and UNS S30400) and one nickel-base alloy (UNS N06601) were immersed in a ternary molten eutectic LiCl-KCl-MgCl2 at 700°C. The post-test coupons were characterized with optical microscopy and scanning electron microscopy (SEM). The viability of the chloride salt as a replacement for the coolant material will be discussed.

Product Number: 51319-13509-SG
Author: Dominic Dinh
Publication Date: 2019
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