PCB-HASL电路板在NaHSO3/Na2SO3溶液中的腐蚀电化学行为

doi:10.11900/0412.1961.2014.00087

金属学报

2014, Vol. 50

Issue (10): 1269-1278 DOI: 10.11900/0412.1961.2014.00087

本期目录 | 过刊浏览

PCB-HASL电路板在NaHSO₃/Na₂SO₃溶液中的腐蚀电化学行为

丁康康, 肖葵(

), 邹士文, 董超芳, 赵瑞涛, 李晓刚

北京科技大学腐蚀与防护中心, 北京 100083

ELECTROCHEMICAL CORROSION BEHAVIOR OF PCB-HASL IN NaHSO₃/Na₂SO₃ SOLUTION

DING Kangkang, XIAO Kui(

), ZOU Shiwen, DONG Chaofang, ZHAO Ruitao, LI Xiaogang

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083

引用本文:

丁康康, 肖葵, 邹士文, 董超芳, 赵瑞涛, 李晓刚. PCB-HASL电路板在NaHSO₃/Na₂SO₃溶液中的腐蚀电化学行为[J]. 金属学报, 2014, 50(10): 1269-1278.
Kangkang DING, Kui XIAO, Shiwen ZOU, Chaofang DONG, Ruitao ZHAO, Xiaogang LI. ELECTROCHEMICAL CORROSION BEHAVIOR OF PCB-HASL IN NaHSO₃/Na₂SO₃ SOLUTION[J]. Acta Metall Sin, 2014, 50(10): 1269-1278.

全文: PDF(5571 KB) HTML

摘要:

采用电化学阻抗谱(EIS)和扫描Kelvin探针技术(SKP)研究了热风整平无铅喷锡处理印制电路板(PCB-HASL)在模拟电解质0.1 mol/L NaHSO₃以及不同pH值的0.1 mol/L NaHSO₃/Na₂SO₃溶液中的腐蚀行为与机理, 探讨了浸泡时间和pH值对其腐蚀机理转变的影响, 通过OM, SEM结合EDS对PCB-HASL表面上腐蚀产物形核和扩展行为进行了观察和分析. 结果表明, PCB-HASL试样在酸性NaHSO₃/Na₂SO₃溶液体系中的腐蚀形式类似点蚀, 浸泡前期腐蚀坑加速扩展, 腐蚀产物主要为Sn的氧化物和硫酸盐. NaHSO₃溶液能够活化PCB-HASL试样表面, 且腐蚀坑形核仅发生在浸泡初期. 而在中性或碱性NaHSO₃/Na₂SO₃溶液体系中, PCB-HASL试样表面腐蚀坑形成受到抑制, 电解质溶液通过氧化膜向电极界面的传输过程限制了电极反应速率.

关键词 ：印制电路板, 热风整平无铅喷锡, NaHSO₃溶液, 电化学腐蚀, 扫描Kelvin探针

Abstract：

With the innovation of electronic technology, integration and miniaturization become the future developing direction of printed circuit board (PCB). Meanwhile, the corrosion problems of PCB also stand out more clearly, and even trace amounts of corrosion products will have a serious impact on the reliability of PCB. Under the actual condition for use, like sulfur-containing industrial environment, due to the diurnal temperature variations or/and the temperature field fluctuations for PCB itself, condensation phenomenon is likely to occur. Furthermore, as a result of the moisture absorption effect of granular deposit or supersaturated humidity, a layer of electrolyte solution will be formed on the surface of PCB, causing electrochemical corrosion. In this work, electrochemical impedance spectroscopy (EIS) and scanning Kelvin probe (SKP) techniques were used to study the corrosion behavior and mechanism of hot air solder leveling printed circuit boards (PCB-HASL) in a simulated electrolyte 0.1 mol/L NaHSO₃ and 0.1 mol/L NaHSO₃/Na₂SO₃ solutions with different pH values, and the influences of immersion time and pH value on the change of corrosion mechanism were discussed. Meanwhile, with the aids of OM, SEM combined with EDS, the nucleation and propagation processes of corrosion products on the surface of PCB-HASL were observed and analyzed. SEM and EDS results showed that the corrosion behavior of PCB-HASL in acid simulation solution was similar to pitting corrosion, and the corrosion pits were in a state of accelerated expansion at the early immersion stage. The corrosion products mainly consisted of oxides and sulfates of Sn. EIS and SKP analysis indicated that the PCB-HASL surface could be activated by NaHSO₃ solution and pitting nucleation process only occurred at the early immersion stage. In the neutral or alkaline solution system of NaHSO₃/Na₂SO₃, pitting corrosion couldn't occur, and the transmission of the electrolyte to the electrode interface through the oxide film was the control step of the corrosion reaction.

Key words： PCB HASL NaHSO₃ solution electrochemical corrosion SKP

收稿日期: 2014-02-25

ZTFLH:

TG174.4

基金资助:*国家自然科学基金资助项目51271032

作者简介: null

丁康康, 男, 1990年生, 硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00087 或 https://www.ams.org.cn/CN/Y2014/V50/I10/1269

图1 在0.1 mol/L NaHSO3溶液中浸泡不同时间后热风整平无铅喷锡处理印制电路板(PCB-HASL)的表面形貌

图2 PCB-HASL试样表面腐蚀区域覆盖率随时间的变化

图3 PCB-HASL试样经不同时间浸泡后的SEM像与EDS分析

图4 在0.1 mol/L NaHSO3溶液中浸泡不同时间后PCB-HASL试样表面Kelvin电位分布

图5 浸泡不同时间后PCB-HASL试样表面Ekp电位分布Gauss拟合曲线

表1 浸泡不同时间后PCB-HASL试样表面Ekp电位分布Gauss拟合结果

图6 在0.1 mol/L NaHSO3溶液中浸泡不同时间后PCB-HASL试样的EIS结果与拟合曲线

图7 在0.1 mol/L NaHSO3溶液中浸泡不同时间的EIS等效电路

表2 在0.1 mol/L NaHSO3溶液中浸泡不同时间的PCB-HASL试样的EIS谱拟合结果

图8 不同pH值NaHSO3/Na2SO3溶液体系中PCB-HASL的表面形貌的OM像

图9 不同pH值0.1 mol/L NaHSO3/Na2SO3溶液中PCB-HASL试样的EIS谱与拟合曲线

图10 中性/碱性NaHSO3/Na2SO3缓冲溶液中EIS等效电路

表3 不同pH值0.1 mol/L NaHSO3/Na2SO3溶液中PCB-HASL试样的EIS拟合结果

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