(Co,Mn)3O4 Spinel Coating for Protecting Metallic Interconnects Thermally Converted from an Electro‐Codeposited Co‐Mn3O4 Composite Coating

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Abstract
Electro‐codeposition was used to prepare the Co and Co‐Mn3O4 precursor coatings on ferritic stainless steel E‐brite. Plated samples were exposed at 800°C in air for different durations (i.e., 10 min and 4 h) for thermal conversion of the deposited layer to a spinel coating. The converted layer was characterized with scanning electron microscopy/energy‐dispersive spectroscopy (SEM/EDS) and X‐ray diffraction (XRD). The results showed that after 10 min heat treatment, the plated Co layer was not fully oxidized and converted into a double‐layer microstructure with an inner CoO layer and outer Co3O4 layer, while for the Co‐Mn3O4 layer, the Mn3O4 particles were not completely dissolved into the oxide layer. After 4 h of exposure, the surface layer was fully converted into the Co3O4 or (Co,Mn)3O4 spinel coating. Though the Mn content in (Co,Mn)3O4 was relatively low, the Mn‐doped spinel coating was advantageous over the pure cobalt spinel coating, as the thermally grown Cr2O3 scale at the coating/substrate interface was more compact and protective. Co diffusion from the deposited layer into the alloy substrate was observed for both coatings.
Funding Information
  • National Natural Science Foundation of China (11204199)
  • Shanxi Scholarship Council of China (2016-096)

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