Decrese of Cr۲O۳ growth at presence of Co-La۲O۳ composite coating

Most current research has concentrated on solid oxide fuel cells (SOFCs) to resolve the contact resistance and cathode-chromium-poisoning problems associated with application of ferritic stainless steels as interconnects. In this study Co-La۲O۳ composite coating was fabricarted onto AISI ۴۳۰ ferritic stainless steel through electrodeposition method. Isothermal oxidation and cyclic oxidation were applied to evaluate the oxide layer thickness which was created during these tests. Results showed Co-La۲O۳ composite coating improved oxidation resistance. The oxide thickness for Co-La۲O۳ composite coated and uncoated specimens was obtained ~ ۰.۷۳ µm and ~ ۳.۴۶ µm respectively after ۱۰۰ h oxidation at ۸۰۰ ºC. The obtained thickness after ۵۰ cycles of oxidation for Co-La۲O۳ composite coated and uncoated specimens was obtained ~ ۰.۵۷ µm and ~ ۳.۳۲ µm respectively. The lower values of oxide layer thickness in each test emphasize that Co-La۲O۳ composite coating layer could have acted as a protective barrier against oxidation by limiting the outward diffusion of Cr cation and inward diffusion of oxygen onion.

کلیدواژه ها:

Co-La۲O۳ composite coating ، Solid oxide fuel cell (SOFC) ، Cr۲O۳ ، AISI ۴۳۰ steel.