Electroplating Ni-doped Mn-Co films on AISI 430 stainless steel as interconnects in solid oxide fuel cells (SOFC)

Abstract

The addition of Ni to Mn-Co films was prepared by electroplating process. Film behavior under corrosive environment was investigated by oxidation techniques. The samples were kept under stagnant air at 800 °C in heat treatment furnace at operating temperature of SOFC for 100 hours. The surface morphology and films compositions were then examined. Mn-Co films with nickel amount of 18.8 wt.-% exhibited the best oxidation resistance. Ni-doped Mn-Co films show high antioxidation behavior because of high film density and crack-free film. The film is composed of many small particles with close packing, and the average particle size is about 1 μm. Film thickness is around 11 μm with surface roughness of 82.97 nm and it has good coherence with substrates. Optimization of nickel amount also plays an important role in antioxidation performance.

Oxidation behaviour of Mn-Co spinel coating on AISI 430 ferritic stainless steel with and without Cu in Ar-CO2-H2O atmosphere

“…Moreover, the spinel coatings also exhibit a high capability to reduce the migration of volatile chromium species from Cr-rich oxide to the electrode-electrolyte-gas interface, leading to a drastic degradation of SOFCs performance [23,24]. Many researchers have attempted to improve the performance of Mn-Co spinel by adding elements of Cu [15,16,[25][26][27][28][29][30][31][32][33], Ni [25,34,35], and Fe [30,31,36]. Our previous works, Mn-Co spinel and doped Mn-Co spinel coatings have been done by using various techniques such as electrochemical deposition [15,16,33] and slurry coating [37].…”

Review—(Mn,Co)3O4-Based Spinels for SOFC Interconnect Coating Application

“…Electrodeposition can produce a single alloy layer or sequential layers of the desired metals with the application of an external electric current, where metal ions from an electrolyte are reduced and deposited on a conductive cathode substrate. 123,124,[164][165][166][167][168] While Bateni et al applied the separate Mn and Co layers on the surface of SUS 430 stainless steel by electroplating with a manganese sulfate solution and a cobalt chloride solution sequentially in a 2:1 molar ratio of Co/Mn, 165 Wu et al co-deposited a uniform and smooth Co-Mn alloy layer directly on SUS 430 substrate by DC or pulse electrodeposition in a solution containing both CoSO 4 and MnSO 4 ; by varying the CoSO 4 and MnSO 4 amounts in the electrolyte solution, a Co-Mn alloy layer with different Mn:Co ratios was achieved. 169,170 Electrolytic codeposition with the oxide particles suspended in the plating solution was successfully utilized to form the Co-Mn 3 O 4 , Co-Mn 3 O 4 -CeO 2 , and Mn-Co alloy-CeO 2 composite coatings.…”