# Compatibility of Carbonate Mixtures to Be Used as Molten Salts with Different Metal Alloys to Be Used as Container Materials

## TL;DR

This study evaluates how corrosive two types of molten carbonate salts are to different metal alloys at high temperatures, important for clean energy technologies.

## Contribution

The paper experimentally evaluates the corrosion behavior of two molten carbonate salts on five metal alloys under high-temperature conditions.

## Key findings

- The corrosion rates of the tested alloys ranged from 0.0009 to 0.0089 mg/cm²·yr.
- The study tested two carbonate mixtures and five metal alloys under an air atmosphere.
- Results provide insights into material compatibility for high-temperature energy systems.

## Abstract

The energy transition can only be achieved if the global energy sector is transformed from a fossil-based system to a zero-carbon-based source system. To achieve this aim, two technologies have shown promising advances in high-temperature application. Concentrating solar power (CSP) plants are seen as a key technology to achieve the needed energy transition, and carbon dioxide (CO2) capture and storage (CCS) is a promising technology for decarbonizing the industrial sector. To implement both technologies, molten carbonate salts are considered promising material. However, their corrosive behavior needs to be evaluated, especially at high temperatures, where corrosion is more aggressive in metal structures. This paper presents an experimental evaluation of the static corrosion of two molten carbonate salts, a Li2CO3-Na2CO3-K2CO3-LiOH∙H2O (56.65-12.19-26.66-4.51wt.%) mixture and a Li2CO3 salt, under an air atmosphere with five corrosion-resistant metal alloys, including Alloy 600, Alloy 601, Alloy 625, Alloy 214, and Alloy X1. In this study, the corrosion rate and mass losses were quantified. In addition, in all the cases, the results of the experimental evaluation showed corrosion rate values between 0.0009 mg/cm2·yr and 0.0089 mg/cm2·yr.