CORROSION BEHAVIOR OF CLOSED CELL ALUMINUM FOAMS

Abstract

Aluminum (barns can be used work as structural material in application For absorbing high impact energy. The heat treatment effect on corrosion of aluminum foam in solution containing 3.5% NaCI environment was studied. The objective of this study is to investigate the corrosion behavior of aluminum foam by using electrochemical method & immersion test method. By using heat treatment process evaluate its corrosion property and mechanical behavior. Sample is passed through different heat treatment process such as solution heat treatment and peak ageing process. To dcterniine the corrosion rate on heat treated sample we initially investigate the second phase or intermetallic particle and volume fraction of metal foam. The effect of heat treatment has to minimize the residual MgZn2 and AbMgCu content in sample. Corrosion rate is demonstrated by using open circuit potential and Potentiodynamic polarization curve. The nature of 'corrosion behavior of aluminum foam is represented by the potential and current plot. There were also studied the influence of heat treatment on micro hardness and microstructural behavior of aluminum foam .This gives the different composition of element show the difThrent behavior against corrosion and passivation of closed cell aluminum foam. The effect of the composition of element on the dissolution and passivation olthis aluminum foam are discussed. Surface analysis was investigated by optical micrograph and scanning electron microscope (SlM). The corrosion behavior is explained on the basis of the microstrueture which includes the phase transformation occurring during heat treatment.