Corrosion of Aluminum, Copper, Brass and Stainless Steel 304 in Tequila

In this study corrosion rates of aluminum, copper, brass and Stainless Steel 304 (SS 304) in tequila are reported from potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) measurements. A simple kinetic model is proposed to analyze the polarization data and to establish a comparison with EIS measurements. For the examined metals/alloys, aluminum exhibited the highest corrosion rate of ca. 6.1 pm s-1 with a pitting corrosion tendency after being exposed to tequila (pH = 3.6). SS 304 was the most stable metal with a corrosion rate of 0.28 pm s-1. The corrosion rate trends for all the investigated metals/alloys from potentiodynamic polarization and EIS measurements are Al > Cu > brass > SS 304.