Electrochemical behavior of platinum-plated anode during high-speed tin electroplating in methanesulfonic acid-based bath
[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.
platinum-plated anodeiridium-coated anodemethanesulfonic acidhigh-speed tin platingelectrochemical behavioroxygen evolution reaction
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