The corrosion characteristics and solderability of immersion tin coatings on copper

A. Arazna , Andrzej Królikowski , G. Koziol , Jerzy Bieliński

Abstract

Immersion tin is widely used as a lead free surface finish in the printed circuit board technology. Tin prevents the underlying copper from corrosion and preserves its solderability during a long storage and lead-free assembly processes. Investigated immersion tin coatings were deposited on copper foil from thiourea-type baths with hydrochloric acid addition (SnHCl coatings) or methanesulfonic acid addition (SnMSA coatings). Obtained coatings were investigated in the as deposited state and after aging (4 h at 155 °C, in air). The scanning electron microscopy studies revealed differences in structure of tin samples deposited from different baths. Results of polarization and impedance investigations indicated that as deposited SnHCl coatings had better corrosion resistance in 0.5 M NaCl solution than SnMSA coatings. The aging resulted in the improvement of the corrosion resistance of thinner coatings (0.2 and 0.5 µm thick SnHCl and 0.3 µm thick SnMSA), which were thoroughly converted into Sn–Cu intermetallic (IMC) phases. In contrary, thicker coatings exhibited some worsening of the corrosion resistance upon aging. The solderability of all as-deposited tin coatings was acceptable, but decreased after aging, especially for thinner coatings, showing the through conversion into Sn–Cu IMC phases.
Author A. Arazna
A. Arazna,,
-
, Andrzej Królikowski (FC / CICSST)
Andrzej Królikowski,,
- Chair Of Inorganic Chemistry And Solid State Technology
, G. Koziol
G. Koziol,,
-
, Jerzy Bieliński (FC / CICSST)
Jerzy Bieliński,,
- Chair Of Inorganic Chemistry And Solid State Technology
Journal seriesMaterials and Corrosion-Werkstoffe und Korrosion, ISSN 0947-5117
Issue year2013
Vol64
No10
Pages914-925
Publication size in sheets0.55
Keywords in Englishcorrosion, immersion tin, impedance spectroscopy, Polarization, solderability
DOIDOI:10.1002/maco.201106434
URL http://onlinelibrary.wiley.com/doi/10.1002/maco.201106434/abstract
Languageen angielski
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Arazna_et_al-2013-Materials_and_Corrosion.pdf 733.2 KB
Score (nominal)30
ScoreMinisterial score = 25.0, 01-08-2019, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 01-08-2019, ArticleFromJournal
Publication indicators WoS Impact Factor: 2013 = 1.508 (2) - 2013=1.366 (5)
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