Co-deposition of CuO and Mn1.5Co1.5O4 powders on Crofer22APU by electrophoretic method: Structural, compositional modifications and corrosion properties

Co-deposition of CuO and Mn1.5Co1.5O4by single step electrophoretic deposition is used to produce15mm coatings on Crofer22APU steel, which finds use as interconnect for high temperature solid oxide cells.Sintering of the green coatings in reducing and then oxidizing conditions led to formation of a mixed (Cu,Mn,Co)3O4spinel. By the incorporation of Cu, the density of the coatings improved. Scanning and trans-mission electron microscopy observations, supplemented with energy dispersive spectroscopy, con-firmed dissolution of Cu in the spinel phase. For the un-doped Mn1.5Co1.5O4both the tetragonal andcubic phases are detected at room temperature by X-ray diffractometry, whereas the addition of Cuseems to stabilize the cubic phase. Initial (1000 h) high temperature corrosion evaluation at 800°Cin air showed promising properties of the mixed spinel coating.