Effect of Triethanolamine Addition in Alkaline Bath on the Electroplating Behavior, Composition and Corrosion Resistance of Zn-Ni Alloy Coatings

Jin Ming Long; Xiu Zhang; He Zhong Pei

doi:10.4028/www.scientific.net/AMR.738.87

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 738Effect of Triethanolamine Addition in Alkaline...

Effect of Triethanolamine Addition in Alkaline Bath on the Electroplating Behavior, Composition and Corrosion Resistance of Zn-Ni Alloy Coatings

Abstract:

Zn-Ni alloy coatings were electrodeposited on low carbon steel substrate using a cyanide-free alkaline bath containing tetraethylenepentamine (TEPA) and triethanolamine (TEA) as complexing agents for Ni²⁺cations. Effect of TEA/Ni²⁺ molar ratio on electrodeposition behavior, micromophology, Ni content and corrosion resistance of coatings were studied by means of SEM/EDS, polarization curve and electrochemical impedance spectroscopy (EIS), respectively. It was found that the deposition potential and elecctrochemical impedance of the cathode sample during the electrodeposition was influenced by the TEA/Ni²⁺ molar ratio (TN_mr) in the bath. The deposition potential shifts negatively and the impedance rises with increasing TN_mr up to 2. The nickel content in Zn-Ni deposit was varied in a range from 16.81 to 19.04 wt.%. The dependence of cathodic current efficiency and depositing velocity of the coating on TN_mr of plating bath were also determined. A fine-grained and smooth-faced coating was obtained at TN_mr =2, which exhibited the highest corrosion resistance in 3.5% NaCl environment.

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Periodical:

Advanced Materials Research (Volume 738)

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87-91

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https://doi.org/10.4028/www.scientific.net/AMR.738.87

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August 2013

Authors:

Jin Ming Long, Xiu Zhang, He Zhong Pei

Keywords:

Alkaline Electrolyte, Complexing Agent, Corrosion Resistance, Electrodeposition, Zn-Ni Alloy

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