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Erosion Resistance Properties of Iron–Carbon Composite Plating to Molten Lead-Free Solder

Industrial Engineering Department, Nagano OKI Electric Co., Ltd., 965, Mimitori, Komoro, Nagano 384-0084, Japan
Graduate School of Engineering, Gunma University, 1-5-1, Tenjin-cho, Kiryu, Gunma 376-8515, Japan
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2724;
Received: 29 December 2018 / Revised: 27 June 2019 / Accepted: 2 July 2019 / Published: 5 July 2019
(This article belongs to the Special Issue Selected Papers from the NMJ2018)
PDF [7625 KB, uploaded 5 July 2019]


The use of Sn-3mass%Ag-0.5mass%Cu lead-free solder (SAC305) has become common. Since SAC305 has a higher content of tin than conventional tin–lead eutectic solder, erosion of the Fe plating layer used in the solder iron tip and the point soldering machine nozzle frequently occurs. In this study, to prolong the life of the Fe plating layer, the applicability of composite plating in which a carbon-type filler is compounded with Fe was studied. Graphite and a multi-walled carbon nanotube (MWCNT) were used as filler materials in the composite plating layer. For both Fe-graphite and Fe-MWCNT composite plating layers, solderability testing and erosion-resistance testing were carried out. In the solderability test, although the spread rates of SAC305 to both Fe-graphite and Fe-MWCNT plating layers slightly decreased compared to the Fe plating layer, SAC305 solder was not repelled against both plating layers. In the erosion-resistance test, the Fe-MWCNT composite plating layer performed the best with the least erosion depth. The erosion depth of the Fe-graphite composite plating layer and the Fe plating layer were 10 and 100 times larger than that of the Fe-MWCNT composite plating layer, respectively. It was confirmed that the diffusion of Fe into molten SAC305 could be greatly reduced due to the composing carbon filler in Fe. View Full-Text
Keywords: erosion resistance; lead-free solder; solder iron tip; composite plating erosion resistance; lead-free solder; solder iron tip; composite plating

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Watanabe, J.; Hatsuzawa, K.; Ogata, S.; Yoshida, S.; Shohji, I. Erosion Resistance Properties of Iron–Carbon Composite Plating to Molten Lead-Free Solder. Appl. Sci. 2019, 9, 2724.

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