| Autor: |
Amedeo Masci, Stefano Frangini, F. Zaza |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Corrosion Science. 62:136-146 |
| ISSN: |
0010-938X |
| DOI: |
10.1016/j.corsci.2012.05.011 |
| Popis: |
A feasibility study has been conducted to determine if a recently developed molten salt perovskite conversion coating process can be applied to protect an intrinsically low corrosion-resistant 13-Cr ferritic stainless steel in Molten Carbonate Fuel Cell (MCFC) demanding environments. The molten salt bath composition has been adapted to evaluate the influence of two different reaction mechanisms, namely dissolution-precipitation and precursor-template synthesis, on microstructure and MCFC corrosion resistance of the LaFeO3-based perovskite coatings. It has been found that the necessary strong basic/oxidizing chemistry conditions for the dissolution-precipitation mechanism to occur cause extensive substrate corrosion that contribute to coating porosity and poor MCFC corrosion protection. On the other hand, excellent corrosion protection of the 13-Cr steel is afforded by a perovskite conversion coating that had been produced via an iron oxide precursor-template route under milder basic conditions. The results show that a decreased salt bath basicity fully suppresses substrate corrosion, while promoting at the same a fine coating microstructure and virtual absence of coating through-porosity, thus markedly improving the barrier properties of coated 13-Cr steel against MCFC corrosion attack. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect