Corrosion resistance and oxide film structure of stainless steels and Ni-based alloys under sulfuric decomposition gas at high temperature

Hirota, Noriaki; Takeda, Kiyoko*; Tachibana, Yukio; Masaki, Yasuhiro*

Zairyo To Kankyo, 70(3), p.68 - 76, 2021/03

https://doi.org/10.3323/jcorr.70.68

Corrosion resistance of stainless steels and Ni-based alloys were evaluated in a sulfuric acid decomposition gas at high temperature. The evaluation were carried out in an environment simulated in the sulfuric acid decomposition reaction vessel for thermochemical hydrogen production process (IS process). Their corrosion films were also analyzed for better understanding of the corrosion behavior. As a result, after 100 hour corrosion test, Ni-based alloy containing 2.4% Si showed good corrosion resistance. Ferritic stainless steel containing 3% Al (3Al-Ferrite) showed better corrosion resistance. Its corrosion rate was lower than that of SiC (0.1mm/year), which is a candidate material for the sulfuric acid decomposition reaction vessel. On the other hand, Ni-based alloy pre-filmed with AlO is prepared as the relative corrosion film of 3Al-Ferrite. Its corrosion rate was significantly higher than that of 3Al-Ferrite. As the result of EPMA analysis of these oxide films, Ni-based alloy containing 2.4% Si formed Si oxide film which had some cracks after the long term corrosion test. Therefore S penetrated into grain boundaries of the matrix through the oxide film. 3Al-Ferrite formed a thin and uniform AlO film, and the penetration of S into the grain boundaries was not observed. AlO pre-film of Ni-based alloy also showed S penetration in the matrix because the AlO pre-film had many small defects originally. The corrosion oxide film of 3Al-Ferrite consisted of only -AlO, while the AlO pre-film consist of -AlO and -AlO. Those results suggest that the better corrosion resistance of 3Al-Ferrite is due to the uniform formation of dense -AlO film at the early stage of the corrosion.

Draft genome sequence of sp. ME121, isolated from soil as a mixed single colony with sp. 32K

Fujinami, Shun*; Takeda, Kiyoko*; Onodera, Takefumi*; Sato, Katsuya; Shimizu, Tetsu*; Wakabayashi, Yu*; Narumi, Issey*; Nakamura, Akira*; Ito, Masahiro*

Genome Announcements (Internet), 3(5), p.e01005-15_1 - e01005-15_2, 2015/09

https://doi.org/10.1128/genomeA.01005-15

Draft genome sequence of calcium-dependent sp. strain TCA20, isolated from a hot spring containing a high concentration of calcium ions

Fujinami, Shun*; Takeda, Kiyoko*; Onodera, Takefumi*; Sato, Katsuya; Sano, Motohiko*; Takahashi, Yuka*; Narumi, Issey*; Ito, Masahiro*

Genome Announcements (Internet), 2(5), p.e00866-14_1 - e00866-14_2, 2014/09

https://doi.org/10.1128/genomeA.00866-14

Identification of DNA mutation sites in a high temperature tolerant mutant of USDA110 generated by ion-beam irradiation

Takeda, Kiyoko; Sato, Katsuya; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 114, 2014/03

Draft genome sequence of sodium-independent alkaliphilic sp. strain TS-1

Fujinami, Shun*; Takeda, Kiyoko; Onodera, Takefumi*; Sato, Katsuya; Sano, Motohiko*; Narumi, Issey*; Ito, Masahiro*

Genome Announcements (Internet), 1(6), P. e01043-13, 2013/12

https://doi.org/10.1128/genomeA.01043-13

Phenotypic characterization of high temperature tolerant mutants of USDA110 generated by ion-beam irradiation

Takeda, Kiyoko; Tejima, Kohei*; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 107, 2013/01

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2012-046.pdf

Colony morphology of high temperature tolerant mutants of USDA 110 obtained by ion-beam microbial mutation-breeding technology

Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 110, 2012/01

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2011-043.pdf

Genome analysis in a high-temperature tolerant mutant of USDA110 generated by Ion-beam breeding technology

Sato, Katsuya; Takeda, Kiyoko*; Narumi, Issey*; Otsu, Naoko*; Yokoyama, Tadashi*

no journal, , 

no abstracts in English

Phenotypic improvement of USDA110 using ion-beam microbial mutation-breeding technology in terms of high temperature tolerant

Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

no journal, , 

In Asian countries, in order to increase crop yield under low input of chemical nitrogen fertilizers, many researchers are trying to develop biofertilizers. However, several researchers point out constraints on application of biofertilizers. Major constraint is a viability loss of beneficial microorganisms in biofertilizers caused by exposure to high temperature and drought stress under both storage and transportation conditions. Therefore, we are trying to improve a phenotypic character concerning high temperature tolerant in USDA110, which is a worldwide superior inoculant to soybean. In this study, ion-beam microbial mutation-breeding technology is used to generate high temperature tolerant mutants. Consequently, we obtained high temperature tolerant mutants of USDA110, which can survive at 45C for 5 days. Now, we are characterizing these mutants in terms of differences in several phenotypic properties.

Generation of high-temperature tolerant mutants of by ion beam irradiation

Takeda, Kiyoko; Tejima, Kohei; Sato, Katsuya; Narumi, Issei; Yokoyama, Tadashi*

no journal, , 

In Asian countries, many researchers are trying to develop biofertilizers. Major constraint of biofertilizer utilization is a viability loss of beneficial microorganisms caused by high temperature stress during both storage and transportation. Therefore, we have tried to improve high temperature tolerance of soybean nodule bacterium. Consequently, we have obtained 20 high temperature tolerant mutants, which can survive at 43C for 7 days. We also successfully generated 5 mutants, which can survive at 47C for 3 days by re-irradiation to mutants that survive at 43 C for 7 days. On the other hand, we found some phenotypic changes of high temperature tolerant mutants. For example, the colony of these mutants was glossy pale pink color unlike wild type. And the generation time of these mutants at 30C was about 1.5 h shorter than that of wild type. There might be a link between high temperature tolerance and these phenotypic changes.