Optimization of Acetate-Based Electrochemical Baths for Electrochemical Deposition of High Purity Molybdenum

Like other refractory metals, molybdenum (Mo) is particularly resilient in extreme environments. As a coating, Mo is desirable for use in corrosive, high-temperature, and high-abrasive environments. Current methods for applying Mo coatings are expensive and/or inadequate for the intended parts. Electrodeposition of Mo from NH 4 + -containing electrolytes has been reported but the mechanism of deposition is not well known. Mo electrodeposition is achievable from high acetate-salt concentration electrolytes but are highly dependent on both pH and ammonium concentrations. We have investigated both parameters to determine what is the minimum concentration of ammonium required to achieve deposits and how the pH changes the oxygen incorporation in these films. This optimization has provided insight into the importance of available hydrogen to tune the oxygen content of the deposits. Figure 1