2015 Fiscal Year Final Research Report
Fabrication of Multi-layered Sn/Ag Coatings with High reliability and High Thermal Stability toward Next-generation Automotive Connectors
| Project/Area Number |
25420769
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Iwate University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 車載端子・コネクタ / スズ・銀めっき / ナノ積層 / 耐熱性 / 電気接触抵抗 / 耐摩耗性 / 耐食性 / LED反射材 |
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| Outline of Final Research Achievements |
Various novel multilayered Sn/Ag3Sn(/Ag) films with Ag thickness of 20-300 nm, which are considered as promising low-cost coating materials for substitution to the noble Au and Ag plating materials, were fabricated by electroplating thin Ag films on reflowed Sn layers on Cu alloy plates toward next-generation high reliable coating materials for automotive connectors and LED lead-frames. The Sn/Ag-based films exhibited excellent thermal stability of electrical contact resistance and reflectance, improved fretting corrosion resistance, and satisfied sulfidizing resistance, superior to conventional Ag and Sn electroplating films. The enhanced performances mentioned above can be mainly attributed to (i) the chemically stable Ag3Sn layer with high hardness that endows a high electrical connection and a low friction coefficient, and (ii) a protective thin SnO film on the intermetallic Ag3Sn layer that isolates the corrosive circumstance.
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| Free Research Field |
機能性表面処理
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