LAO X D, ZHAO J, CHENG C Q, et al.Effect of leaching acid solution on leaching and electrochemical characteristics of heavy metals from SnPb solder[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):182-188.

doi:10.16186/j.cnki.1673-9787.2021020033

Received:2021/02/20

Revised:2021/06/24

Published:2023/03/25

Effect of leaching acid solution on leaching and electrochemical characteristics of heavy metals from SnPb solder

LAO Xiaodong1,2, ZHAO Jie3, CHENG Congqian3, LIU Xiaoqing1,2, XIE Juanjuan1,2

1.School of Mechanical and Electrical Engineering，Zhoukou Normal University，Zhoukou  466000，Henan，China；2.The Key Laboratory of Rare Earth Functional Materials and Applications，Zhoukou Normal University，Zhoukou  466000，Henan，China；3.School of Materials Science and Engineering，Dalian University of Technology，Dalian  116024，Liaoning，China

Abstract:SnPb solder of electronic products was employed in this paper，to study the characteristics of leaching and migration of heavy metals in soil，and to evaluate the degree of environmental pollution risk.The effects of leaching components on the corrosion leaching behavior of heavy metals and electrochemical characteristics of the solder leached by different acidic solutions were studied，the leaching rate of heavy metals，surface corrosion products，morphology and potentiodynamic polarization curve were analyzed.The results showed that the corrosion current density of SnPb solder was the highest under the condition of H₂SO₄-HNO₃ solution.PbSO₄ was observed on the solder surface as corrosion product，and the leaching rate of Sn was the highest，indicating the highest pollution risk to groundwater and the high risk to soil from Pb.The corrosion current density of SnPb solder was the lower leached by HNO₃-HCl solution，and the highest leaching rate of Pb represented the highest pollution risk to groundwater.

Key words:SnPb solder;leaching of heavy metal;electrochemical characteristic;surface corrosion;pollution risk

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