The effect of ARB process on corrosion behavior of nanostructured aluminum alloys in Na2HPO4•12H2O and Zn(NO3)2•6H2O PCMs

Phase change materials (PCMs), have high thermal energy storage due to hidden heat. One of the PCMs is hydrate salts. The insufficient long term stability of the storage materials, as containers, are the main concern in the energy storage systems which were investigated in this study. In this order, various common metals (Fine-grained Al1100 and Al6061 alloys by six cycles of accumulative roll bonding (ARB)) process were selected, and their corrosion resistance in contact with two different hydrate salts of (Na2HPO4 center dot 12H(2)O and Zn(NO3)(2)center dot 6H(2)O) were tested. The immersion test method was utilized. In this way, samples were placed in the test tubes containing molten hydrate salts into a thermo-static water bath in three different periods of six, twelve and eighteen days at the temperature range of 55 to 60 degrees C. After each period, the sample weight loss rate was measured, and then the corrosion rate was calculated. The corrosion rate of ARBed Al 1100 and ARBed Al 6061 alloys in the Na2HPO4 center dot 12H(2)O at the end of eighteen days were 103.07 and 78.82 mpy, respectively. Furthermore, the corrosion rate of ARBed Al 1100 and ARBed Al6061 alloys in the Zn(NO3)(2)center dot 6H(2)O was reported 88.67 and 68.71 mpy, respectively. The results indicated that the corrosion rate for Al1100 alloy is less and more than Al6061 alloy in the molten Na2HPO4 center dot 12H(2)O and molten AZn(NO3)(2)center dot 6H(2)O, respectively.