Temperature and NaCl deposition dependent corrosion of SAC305 solder alloy in simulated marine atmosphere  

作　　者：Chuang Qiao Mingna Wang Long Hao Xiahe Liu Xiaolin Jiang Xizhong An Duanyang Li 

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang,110819,China [2]Environmental Corrosion Centre of Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [3]Department of Physics,Hebei Normal University of Science technology,Qinhuangdao,066004,China [4]School of Material Science and Engineering,University of Science and Technology of China.Hefei,230026,China [5]College of Mechanical Engineering,Institute of Innovative Science and Technology,Shenyang University,Shenyang,110044.China

出　　处：《Journal of Materials Science & Technology》2021年第16期252-264,共13页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.51601057 and 51701038)and the Marine Science Special Project of Hebei Normal University of Science&Technology(No.2018HY004),and the authors acknowledge the assistance.

摘　　要：The stable operation of electronic devices in marine atmospheric environment is affected by the corrosion deterioration of solder joints,and the effects by atmosphere temperature and chloride deposition are critical.In this work,NaCl deposition and temperature dependent corrosion of Pb-free SAC305 solder in simulated marine atmosphere has been investigated.The results indicate that higher NaCl deposition prolongs the surface wetting time and leads to the final thicker saturated electrolyte film for further corrosion.Higher temperature accelerates the evaporation and contributes to the final thinner saturated NaCl electrolyte film.Besides,the corrosion control process varies under the initially covered thicker NaCl electrolyte layer and under the final saturated much thinner NaCl electrolyte film as the evaporation proceeds.Moreover,the ready oxygen availability through the final thinner saturated NaCl electrolyte film facilitates the formation of corrosion product layer mainly of electrochemically stable SnO2,but higher temperature leads to the final corrosion product layer with smaller crystal size and large cracks.The findings clearly demonstrate the effects of NaCl deposition and temperature on corrosion evolution of SAC305 solder joints and are critical to the daily maintenance of electronic devices for longer service life in marine atmosphere.

关 键 词：Atmospheric corrosion SAC305 solder Marine atmosphere NACL TEMPERATURE 

分 类 号：TG172[金属学及工艺—金属表面处理]