The presence of excessive lead in zinc sulfate electrolytes can lead to problems related to both processing efficiency and the properties of the metal produced. For example, poor adhesion can occur in electrogalvanized steel when it is heated in the temperature range of 215 °C to 280 °C if lead is present in the deposit. The duration of heating necessary to induce the peeling of the zinc was found to be dependent on the temperature, time, and concentration of lead in the electrolyte and the plating parameters. The presence of lead slowed the formation of the intermetallic, and the peeling occurred between the zinc and the iron-zinc intermetallic layer. In order to gain a better fundamental understanding of the role of lead, rotating disc electrodes were used to measure the diffusion coefficient of lead in the zinc sulfate electrolyte. The experimentally determined mass transport data on lead can be used as an aid to set an acceptable limit of lead allowable in the electrolyte or to evaluate the electrochemical characteristics of an electrolytic zinc system. By the addition of strontium carbonate to the plating solution followed by filtration, the lead concentration in the electrolyte could be reduced to an acceptable level, preventing the poor adhesion on heating. © 1990 The Minerals, Metals & Material Society.
V. Srinivasan et al., "The Effects Of Lead On The Electrochemical And Adhesion Behavior Of Zinc Electrodeposits," Metallurgical Transactions B, vol. 21, no. 1, pp. 81 - 86, Springer, Feb 1990.
The definitive version is available at https://doi.org/10.1007/BF02658118
Materials Science and Engineering
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01 Feb 1990