[Introduction]The feasibility of Pt-plated anode as an alternative to Ir-coated anode for high-speed tin electroplating in methanesulfonic acid(MSA)needs to be studied.[Method]The surface morphologies and three-dimensional profiles of Pt-plated anode and Ir-coated anode were compared.The electrochemical behaviors of the two types of insoluble anodes during high-speed tin electroplating in MSA-based bath were studied by anodic polarization curve measurement,potentiodynamic electrochemical impedance spectroscopy,and multi-current step chronopotentiometry.The service lives of both anodes were also examined.[Result]Compared with Ir-coated anode,Pt-plated anode had finer grains but greater surface roughness.The addition of grain refiner and antioxidant to MSA-based bath could enhance the polarization behavior of Pt-plated anode,but had little effect on the polarization behavior of Ir-coated anode.The reactions of both anodes during high-speed tin electroplating in MSA-based bath were dominated by oxygen evolution.Anode life was related to the adopted current density.Low current density i.e.10 to 30 A/dm2 was beneficial for the long-term service life of Pt-plated anode.The impact of Pt-plated anode and Ir-coated anode on the key properties of MSA-based bath was essentially the same.[Conclusion]Pt-plated anode is suitable for high-speed tin electroplating in MSA-based bath.
关键词
铂镀层阳极/铱涂层阳极/甲基磺酸/高速镀锡/电化学行为/析氧反应
Key words
platinum-plated anode/iridium-coated anode/methanesulfonic acid/high-speed tin plating/electrochemical behavior/oxygen evolution reaction
维普
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