In this short review we highlight the importance and the capabilities of composition spread alloy films (CSAFs) for the high-throughput study and comprehensive understanding of corrosion passivation in multicomponent alloys, AxByC1−x−y, spanning composition space, x ∈ [0, 1] and y ∈ [0, 1 − x]. After first establishing the mechanistic issues associated with corrosion, and the problems arising from the corrosion of metals, we establish the need for further studying and understanding the mechanisms of alloy corrosion and corrosion passivation. In particular, we highlight the development of new combinatorial methods that circumvent the experimental bottleneck associated with preparing, characterizing, and testing many alloy samples having common components at different compositions. We will illustrate the use of CSAFs in studying corrosion across alloy composition space. Because of their structure and inherent composition range, CSAFs enable many novel studies that are otherwise intractable using the traditional methods of preparing and testing one alloy composition at a time.