✦ LIBER ✦

EIS as a means of evaluating electroless nickel deposits

✍ Scribed by E.T. van der Kouwe

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 438 KB
Volume: 38
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(93)80345-z

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✦ Synopsis

Electroless nickel coatings on mild steel were exposed to quiescent acidic NaCl solutions. Thick coatings exhibit a frequency dispersion in the Bode phase diagram which has been attributed to a self-protective reaction of the coating involving an enriched phosphorus layer and the electrolyte. The open-circuit potential (OCP) starts moving towards more negative potentials as soon as penetration of the coating has taken place, thereby triggering corrosion of the substrate. Non-uniform or porous EN coatings drift towards negative potentials with little or no frequency dispersion. The degradation of coatings was monitored by electrochemical impedance. spectroscopy (EIS).

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