The corrosion behaviours of stainless steel 316 (SS-316), copper (Cu) and aluminium 1060 (Al-1060) in composite molten hydrate salt phase change materials (PCM) composed of Na2HPO4·12H2O – Na2SO4·10H2O have been studied by electrochemical measurements in conjunction with SEM and XRD. The corrosion resistance of the metals in the composite molten PCM follows SS-316 > Cu > Al-1060. The role of the composite molten PCM affecting the corrosion resistance and its mechanisms of the metals are as following: the experiments reveal that SS-316 readily gets passivated in the composite molten PCM medium with no considerable corrosion; Cu suffers an initial rapid anodic dissolution which is further impeded by the formation of spot-like salt precipitates on the substrate, mainly consisting of CuHPO4·nH2O, CuSO4·nH2O and Cu2O; Al-1060 shows a continuous large dissolution in the studied PCM with a porous corroded surface morphology due to the complete destruction of passive film under the attack of OH− ions.
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