engleski

Surface morphology of Cu-Al-Ni shape memory alloy after corrosion testing in 0.5 M NaCl solution

Shape memory alloys are usable in numerous areas. The effect of the shape memory alloys is basically a recollection on a former deformation of the applied form of the material. In the physical sense, it is a byproduct of the martensite phase transformation in the structure of the homogenous matter. Microstructural analysis of Cu-Al-Ni alloy before corrosion testing was carried out by optical and scanning electron microscopy, respectively. The corrosion behaviour of Cu-Al-Ni shape memory alloy in deaerated 0.5 M NaCl solution at 20 ºC was studied by means of polarization measurements. Surface morphologies of selected specimens after corrosion testing (at -0.2V and 0.4V) were investigated by optical microscope, SEM and EDX microanalysis. The polarization measurements have shown that the corrosion behaviour of Cu-Al-Ni alloy in NaCl solution was dominated by the Cu component. The SEM and EDX microanalysis showed the presence of copper, aluminium and nickel oxides and chlorides on alloy surface.

shape memory alloy ; polarization ; corrosion ; microstructure

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