| Project/Area Number |
03650563
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
SERI Osami Muroran Institute of Technology,Associate Professor, 工学部, 助教授 (60179356)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1991: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | aluminum / aluminum alloy / pitting attack / impurity / surface treatment / リサイクル / 金属間化合物 / 電気化学 / 選択溶解 |
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| Research Abstract |
Fundamental effects of impurities such as iron in industrial aluminum on corrosion behavior have been investigated. The following results are obtained: 1.The effective electrochemical treatment. by which preferential removal of FeAl_3 particles from the Al-Fe alloy surface can proceed,has been investigated. The proposed treatment is potentio-dynamical polarization method in a certain potential range in deaerated Al(NO_3)_3 solution. 2.The intermetallic compounds which is electrically conducted to the aluminum matrix play a cathodic role, and at the same time dissolve themselves into the solution due to their small polarization resistance. 3.The area polarization technique characteristically shows rapid and contionous measuring system. It is found that the oxygen concentration at occurrence of the pitting attacks of 5052 shows the value of 900ppb in the 5000ppm NaCl solution. 4.An attempt is made to explain a experimental evidence that the peak value of anodic current density at about -0.95V vs. Ag/AgCl in the anodic polarization curves of Al-Zn alloy specimens in deaerated 0.1M NaCl solution. It was found that this can be explained in terms of the anodic reaction which is oxidation of zinc element in the Al-Zn alloy specimen to zinc hydroxide.
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