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Article
Development of a New Electrodeposition Process for Plating of Zn-Ni-X (X = Cd, P) Alloys: Permeation Characteristics of Zn-Ni-Cd Ternary Alloys
Journal of the Electrochemical Society
  • A. Durairajan, University of South Carolina - Columbia
  • B. S Haran, University of South Carolina - Columbia
  • Ralph E White, University of South Carolina - Columbia
  • Branko N Popov, University of South Carolina - Columbia
Publication Date
1-1-2000
Document Type
Article
Subject Area(s)
Chemical Engineering
Disciplines
Abstract
It is shown that an electrodeposited Zn-Ni-Cd alloy coating produced from sulfate electrolyte inhibits the discharge of hydrogen on carbon steel. The newly developed ternary alloys have approximately ten times higher corrosion resistance when compared to a Zn-Ni alloy. Hydrogen permeation characteristics of Zn-Ni-Cd alloy coatings were studied and compared with those of a bare and a Zn-Ni alloy coated steel. The transfer coefficient, a, exchange current density, io, thickness dependent adsorption-absorption rate constant, k0, recombination rate constant, k3, surface hydrogen coverage, θH, were obtained by applying a mathematical model to experimental results. Alloys obtained from baths containing higher concentration than 3 g/L of CdSO4 in the sulfate plating bath are seen to have superior permeation inhibition properties compared to the Zn-Ni alloy coating and bare steel. The hydrogen permeation current was zero under normal corroding conditions for Zn-Ni-Cd alloy and it increased to 0.3 mA/cm2 at a cathodic overpotential of 250 mV. The hydrogen permeation current density for steel and Zn-Ni alloy under similar conditions were 62.1 and 1.3 mA/cm2, respectively.
Citation Information
A. Durairajan, B. S Haran, Ralph E White and Branko N Popov. "Development of a New Electrodeposition Process for Plating of Zn-Ni-X (X = Cd, P) Alloys: Permeation Characteristics of Zn-Ni-Cd Ternary Alloys" Journal of the Electrochemical Society (2000) p. 4507 - 4511
Available at: http://works.bepress.com/ralph_white/197/