| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
This study was aim to clarify the influence of alloying metals in weathering steels on the formation, density and stability of steel rust layer using artificial steel rust particles and to elucidate the replacement of rare metals alloying with weathering steels. The results obtained were summarized as follows. (1) Alloying Cr and Cu in weathering steels form the fine gamma-FeOOH rust particles, but no significant influence of Ni and Ti is recognized. (2) Adding Ni(II) and Cu(II) inhibit the formation of magnetite rust to produce fine alpha-FeOOH rust particles. This tendency can be found in the case of Sn(II)and La(III) addition, suggesting that Sn and La are useful alloying metals for replacement of rare metals in weathering steels. (3) The Cr(III) addition in Evans cycle suppresses the magnetite formation to generate nano-sized alpha-FeOOH rust particles.
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