Non-ferrous metals and alloys such as aluminum copper and brass are frequently used for a wide range of applications in several industries including the automotive and electronics industries. Under ambient condition these metals are protected from corrosion by passivating oxide layers. However when in contact with corrosive media such as alkaline water-based metalworking fluids they require additional protection in the form of a corrosion inhibitor. This study will investigate the performance of non-ferrous metal corrosion inhibitors in metalworking fluids and other water-based systems. It will explore how different chemistries perform on different metal substrates and will examine the advantages and disadvantages of these chemistries.