When mixed in various proportions and types to create phase change materials with specific temperatures, the corrosive nature of salts presents a significant challenge. Despite many molten salts’ wide availability and reasonable cost, their tendency to corrode metal components in containers severely limits their reusability in cyclic applications. This study investigates the corrosion behavior of Na2CO3-K2CO3 based high-temperature phase change material on different metal substrates, namely 0Cr25Ni20, coated 0Cr25Ni20, 0Cr21Al6, and 0Cr27Al7Mo2. The weight loss method is utilized to quantify the extent of corrosion, while XRD and SEM analyses are employed to identify the reactants and products involved in the corrosion process. The results indicate that 0Cr21Al6 demonstrates superior corrosion resistance, whereas the coated 0Cr25Ni20 substrate shows comparatively lower resistance.