In the present work is determined, the increase in erosive wear resistance to cavitation, TiN coatings obtained by physical vapour deposition (PVD) on aluminium (99% commercially pure). The wear tests were performed by vibratory cavitation in bioethanol-gasoline mixtures with concentrations of 5% to 30%, in order to study the evolution of erosive wear by cavitation. The characterization after deterioration test was performed by scanning electron microscopy for the different testing times. Because of the cavitation test, the mass loss was determined and, sequential study of the surface appearance of the samples was done to determine the wear mechanisms prevailing in each stage. The results were analysed by atomic force microscopy characterization and scanning electron microscopy of previous form. From the results, it is seen that the highest rate of wear Corresponding to bare aluminium, and with Respect to the further degradation obtained mixture with a high concentration.