Effect of Ni Content on the Hardness, Corrosion Rate and Heat Stability of Cladding Structure Material With an Aluminium Base Alloy

The development of cladding structure material with an aluminium base alloy was performed by variation of Ni content in the alloy. Various of Ni content in alloy will generates material properties changes in mechanical, physical and thermal. The investigation and development of cladding structure material was studied in order to get materials which have good mechanical properties and corrosion resistance. The examination of the hardness of AlFeNi structure materials was observed using Vickers method. The microstructure observation was performed by optical metallography. The corrosion rate measurement was done by the potentiostat. The thermal analysis was done based on specific heat pattern. The hardness examination results of AlFeNi alloy with 1%, 2%, 3%, 4% wt Ni contents were respectively about 50 HV, 53 HV, 58 HV and 64 HV. The hardness of AlFeNi alloy showed improvement with increasing Ni content in the alloy. Result of optical metallographic observation showed microstructure of AlFeNi alloy change along with the increasing of Ni content in the alloy. Microstructure of the AlFeNi alloy with 1%, 2%, 3% and 4% wt Ni contents showed that grain structure was dendritic formed inclined smaller. The corrosion rate observation result of the AlFeNi alloy with 2%, 3% and 4% wt Ni contents were about 0.064 mpy, 0.16 mpy, 0.39 mpy and 0.96 mpy. The corrosion rate of AlFeNi alloy showed tend to increase with increasing of Ni content in the alloy. The specific heat analysis result of the aluminium and aluminium alloy at the variation temperature up to 400oC showed tendency of specific heat pattern changes were relatively the same. Thermal properties of AlFeNi alloy was relatively stable and its pattern relatively the same with the aluminium. The AlFeNi alloy without any thermal properties changes although at the higher temperature up to 240oC. (author)