Steel can be protected by several methods. One of them is the protection by electrolytic coatings like zinc nickel or chromium coatings. But the electrolytic process involves risk to the environment and health. More environmental-friendly solutions are based on PVD processes and in this field aluminum coatings are widely studied. However aluminum has poor mechanical properties and its passivation trend could favour localized degradation in chlorine environment increasing largely the dissolution of element. In order to improve the sacrificial protection and the mechanical properties provided by the aluminum coatings several alloying elements have been tested as monolayers in particular Mo Mg and Mn