LEACHING BEHAVIOR OF LEAD-FREE SOLDERS IN A NaCl-Na2SO4-Na2CO3 MIXED SOLUTION AS SIMULATED SOIL

J Chin Soc Corr Pro

2011, Vol. 31

Issue (5): 381-384 DOI:

Research Articles

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LEACHING BEHAVIOR OF LEAD-FREE SOLDERS IN A NaCl-Na₂SO₄-Na₂CO₃ MIXED SOLUTION AS SIMULATED SOIL

WANG Lihua, CHENG Congqian, YANG Fen, ZHAO Jie

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085

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Abstract Leaching behavior of Sn-3.5Ag-0.75Cu and Sn-0.75Cu lead-free solder alloys in a NaCl-Na₂SO₄-Na₂CO₃ mixed solution as simulated soil was investigated and compared with that of Sn-37Pb alloy. The results showed that leaching amount of Sn from the three solders increased with reaction period. The most leaching amount of Sn was found for Sn-0.7Cu solder alloy. However, Sn leached from Sn-3.5Ag-0.75Cu solder alloy was depressed by adding Ag element. The leaching amount of Ag, Cu and Pb elements also increased linearly with increasing time. However, the relatively less amount of leached Ag and Cu was measured. The product on the leached solder alloy surface was identified as Sn₄(OH)₆Cl₂ and SnO. Many cracks and pits were found in the product on Sn-0.75Cu alloy surface, while the product layer on Sn-3.5Ag-0.75Cu alloy was rather compact. For Sn-37Pb alloy, some product had spalled from the surface. Based on the experimental results, it was supposed that the phase formation and morphology of surface product were responsible for the difference of leaching kinetics for these three solder alloys.

Key words: lead-free solder alloys NaCl-Na₂SO₄-Na₂CO₃ mixed solution leaching kinetics morphology phase composition

Received: 21 July 2010

ZTFLH:

TG172

Corresponding Authors: ZHAO Jie E-mail: jiezhao@dlut.edu.cn

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WANG Lihua, CHENG Congqian, YANG Fen, ZHAO Jie. LEACHING BEHAVIOR OF LEAD-FREE SOLDERS IN A NaCl-Na₂SO₄-Na₂CO₃ MIXED SOLUTION AS SIMULATED SOIL. J Chin Soc Corr Pro, 2011, 31(5): 381-384.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I5/381

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