On the use of ferrous sulfate treatment to enhance the corrosion resistance of copper-nickel alloys

Ferrous sulfate (FeSO₄) treatment is a technique used to protect copper and its alloys against corrosion by promoting the formation of a protective surface film. However, the effectiveness of FeSO₄ treatment is dependent on a number of parameters relating to how the treatment is applied. This article summarizes the various FeSO₄ treatment parameters explored in prior studies, highlighting the significance of key parameters such as fluid flow, media replenishment, and media composition in treating copper-nickel (CuNi) alloys. Furthermore, a series of experiments are conducted to validate the impact of these critical parameters on the formation and composition of the protective film on treated alloys. The results obtained emphasize the importance of these parameters in achieving a successful FeSO₄ treatment and improved corrosion resistance for CuNi alloys. Overall, this paper provides an overview of the various FeSO₄ treatment parameters and how they affect the treatment outcome for CuNi alloys.