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The solid surface tension plays an important role in the heat and mass transfer system for heat exchanger equipment. In the nuclear power plant industry, Zircalloy 4 has been used for long time as structure materials. The purpose of the experimental is to study solid state surface tension behavior by measure contact angle of aquades and Nano fluid contain nano particle alumina on metal surface of Zircalloy 4 before and after oxidation at 700°C by sessile drop method. The experiment is to measure the static contact angle and drop of aquades and nano fluid contains nano particle alumina on zircalloy 4 with different spreading time from 1 to 30 minute. It was observed that zircalloy 4 after oxidation lose their hydrophobic properties with increasing elapsed time during drop of a aquades and nano fluid on the surface of alloy compared with zircalloy 4 before oxidation. As a result the contact angle of aquades and nano fluid on surface of zircalloy 4 before and after oxidation is decrease grdually during increasing elapsed time. While the magnitude diameter drops of aquades and nano fluid and wetting surface are increase with increasing elapsed time on the surface of Zircalloy 4 before and after oxidation. It was observed that oxidised zircalloy4 good wettability properties compare with non oxidised zircaloy 4.

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