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The influence of iodate ion additions to the bath on the deposition of electroless nickel on mild steel

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An alkaline hypophosphite bath (0.1 M nickel sulphate, 0.2 M sodium hypophosphite, 0.2 M sodium acetate and 0.1 M malic acid, adjusted to pH 5) was used to produce Ni-P coatings on uncoated and electroless nickel pre-plated mild steel. The deposition was monitored by open-circuit potential-time monitoring vs. a saturated calomel reference electrode and potentiostatic current-time monitoring together with anodic and cathodic polarisation. Classical mixed potential theory was applied to the polarisation data to calculate the effect of controlled iodate ion additions (0-1000 ppm) as an accelerator to the electrolyte on the plating rate. The mixed potential and deposition current density increased gradually with potassium iodate concentration. The use of electrochemical data allowed the optimum iodate additive concentration to be established using simple instrumentation.
Original languageEnglish
Pages (from-to)275-284
JournalTransactions of the Institute of Metal Finishing
Volume96
Issue number5
Early online date10 Sep 2018
DOIs
Publication statusPublished - Oct 2018

Documents

  • TIMF 2018_iodate_post print version

    Rights statement: This is an Accepted Manuscript of an article published by Taylor & Francis in Transactions of the Institute of Metal Finishing on 10/09/2018, available online: http://www.tandfonline.com/10.1080/00202967.2018.1503852.

    Accepted author manuscript (Post-print), 1.12 MB, PDF document

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