Electric Current Effects on the Corrosion Behaviour of High Chromium Ferritic Steels

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Section: Resultscontrasting

confidence: 66%

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Molin

Jasiński

Mikkelsen

et al. 2016

“…There was no systematic difference between the two sides of the samples, i.e. there was no indication that the current direction across the sample influenced the ASR, unlike what has been reported in some studies [49,50]. At the end of the aging test (4370 h at 800 °C), the ASR is 14±1 m cm 2 for the MC coated, 16±2 m cm 2 for the MCFe coated, 15±1 m cm 2 for the MCCu coated, and 50 m cm 2 for the uncoated Crofer 22 APU (average and standard deviation of four individual measurements for the coated samples).…”

Section: Area Specific Resistancementioning

confidence: 57%

Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects

Talic

Molin

Wiik

et al. 2017

“…It can also be excluded to be an effect of the applied current, the measurement was only done during very limited time of the experiment and the 75 h breakdown of the electronic measurement observed after 130 h of exposure lead to the suspicion that the effect was caused by something else, such as platinum interaction. Findings on increased oxidation under the influence of current such as reported by Kawamura et al and Kodjamanova et al are not considered as applicable here, since the measurement time was only very short (less than 0.1%) compared to the overall exposure time [32,33].…”

Section: Asr Characterizationmentioning

confidence: 99%

Coated stainless steel 441 as interconnect material for solid oxide fuel cells: Evolution of electrical properties

Grolig

Froitzheim

Svensson

2015

h i g h l i g h t sWe exposed cerium/cobalt coated AISI 441 in a SOFC cathode side atmosphere. We tested two different methods of ASR measurement. In-situ measured samples were heavily affected by platinum electrodes. ASR values of ex-situ measured samples could be related to oxidation. The oxidation and chromium volatilization were monitored. a b s t r a c t AISI 441 coated with a double layer coating of 10 nm cerium (inner layer) and 630 nm cobalt was investigated and in addition the uncoated material was exposed for comparison. The main purpose of this investigation was the development of a suitable ASR characterization method. The material was exposed to a simulated cathode atmosphere of air with 3% water at 850 C and the samples were exposed for up to 1500 h. We compared two methods of ASR measurements, an in-situ method where samples were measured with platinum electrodes for longer exposure times and an ex-situ method where preoxidized samples were measured for only very short measurement times. It was found that the ASR of ex-situ characterized samples could be linked to the mass gain and the electrical properties could be linked to the evolving microstructure during the different stages of exposure. Both the degradation of the electric performance and the oxygen uptake (mass gain) followed similar trends. After about 1500 h of exposure an ASR value of about 15 mUcm 2 was reached. The in-situ measured samples suffered from severe corrosion attack during measurement. After only 500 h of exposure already a value of 35 mUcm 2 was obtained.