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

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

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.

Current vs. time, electroless nickel, immersion plating, polarisation data, potential vs. time
0020-2967
275-284
Court, S.
b994989c-f557-4d5b-96b4-53660c74afc6
Kerr, C.
1bab5747-1578-4af2-938b-f733f3a96187
Ponce de León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Barker, B. D.
74e8d2f7-7cd3-418c-8190-ebf2197b51b9
Smith, J. R.
5b4f6d25-bc04-48ac-a98c-4bed81602d64
Walsh, F. C.
309528e7-062e-439b-af40-9309bc91efb2
Court, S.
b994989c-f557-4d5b-96b4-53660c74afc6
Kerr, C.
1bab5747-1578-4af2-938b-f733f3a96187
Ponce de León, C.
508a312e-75ff-4bcb-9151-dacc424d755c
Barker, B. D.
74e8d2f7-7cd3-418c-8190-ebf2197b51b9
Smith, J. R.
5b4f6d25-bc04-48ac-a98c-4bed81602d64
Walsh, F. C.
309528e7-062e-439b-af40-9309bc91efb2

Court, S., Kerr, C., Ponce de León, C., Barker, B. D., Smith, J. R. and Walsh, F. C. (2018) The influence of iodate ion additions to the bath on the deposition of electroless nickel on mild steel. Transactions of the IMF, 96 (5), 275-284. (doi:10.1080/00202967.2018.1503852).

Record type: Article

Abstract

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.

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Court iodate Ni TIMF_2018_iodate_post_print_version - Accepted Manuscript
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More information

Accepted/In Press date: 4 June 2018
e-pub ahead of print date: 10 September 2018
Published date: 10 September 2018
Keywords: Current vs. time, electroless nickel, immersion plating, polarisation data, potential vs. time

Identifiers

Local EPrints ID: 426581
URI: http://eprints.soton.ac.uk/id/eprint/426581
ISSN: 0020-2967
PURE UUID: b13f84cb-0332-4639-972d-fff8cb999867
ORCID for C. Ponce de León: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 30 Nov 2018 17:30
Last modified: 12 Sep 2019 04:01

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Contributors

Author: S. Court
Author: C. Kerr
Author: B. D. Barker
Author: J. R. Smith
Author: F. C. Walsh

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