2004 Fiscal Year Final Research Report Summary
Development of surface treatment for aluminum and its alloys by preferential devolvement of Intermetallic phase
| Project/Area Number |
15560615
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
SERI Osami Muroran Institute of Technology, Mechanical system, Professor, 工学部, 教授 (60179356)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Masahiro Muroran Institute of Technology, Mechanical system, Assistant, 工学部, 助手 (20301963)
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| Project Period (FY) |
2003 – 2004
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| Keywords | aluminum / Intermetallic phase / preferential removement / pretreatment / corrosion resistance / surface treatment / elecrochemical / iron |
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| Research Abstract |
The corrosion characteristics of aluminum power cable on which the intermetallic phase were successfully removed by the cathodic treatment in a 20% nitric acid solution at current density of -2kA/m^2 were examined in a 1.0kmol/m^3 NaCl solution. It was found that the FeAl_3 free surface of aluminum power cable by the treatment showed corrosion behavior of high purity aluminum. Electrochemical measurements revealed that the FeAl_3 free surface coated by the anodizing finishing treatment exhibits excellent oxide film performance. We have shown that the Al-Fe-Si intermetallic compound particles exposed on 1100 aluminum wrought alloy (industrially pure aluminum alloy) are preferentially and selectively removed by two steps : the first step is selective dissolution of aluminum component in the Al-Fe-Si intermetallic compound by electrochemical reaction. The second step is intensive removal of the iron-enriched intermetallic particles on which vigorous hydrogen bubbling has been took place, which is accelerated by application of ultrasonic vibration. It is found that the intermetallic compound-free surface obtained by the proposed technique is preferable for the surface treatment such as Ni-P electroless plating.
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