Abstract
Protective CuNiMnO spinel coatings on UNS430 solid oxide fuel cells interconnects were formed by oxidizing electroplated nickel, copper, and manganese in air at 800 °C. Nickel prevented delamination and buckling damage of the coatings. Substituting copper with nickel up to 40% in CuMn2O4 spinel decreased conductivity slightly from ∼110 to ∼95 S/cm at 800 °C. XRD showed Cu0.77Ni0.45Mn1.78O4 exhibited predominantly spinel phase whereas nickel free Cu1.18Mn1.82O4 exhibited mixed oxide phase. Nickel promotes adhesion and formation of uniform protective coatings as <1 μm Cr-oxide scale formed after 120 h of oxidation and it also stabilizes the spinel phase at lower temperatures.
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