Corrosion behaviours of typical metals in molten hydrate salt of Na2HPO4·12H2O – Na2SO4·10H2O for thermal energy storage. (4th July 2019)

• Record Type: Journal Article
• Authors: Zhao, Tianyu; Zheng, Maosheng; Munis, Adnan; Hu, Jun; Teng, Haipeng; Wei, Liping
• Is Part Of: Corrosion engineering, science, and technology. Volume 54:Number 5(2019)
• Page Start: 379
• Page End: 388
• Publication Date: 2019-07-04
• Subjects: Hydrate salt -- molten -- alloy -- corrosion -- electrochemistry -- anodic dissolution; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2019.1595296
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: 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 Na2 HPO4 ·12H2 O – Na2 SO4 ·10H2 O 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 ·nH2 O, CuSO4 ·nH2 O and Cu2 O; 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.