Development of Nano-Structured Cyclic Multilayer Zn-Ni Alloy Coatings Using Triangular Current Pulses
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BHAT, Ramesh, HEGDE, A.. Development of Nano-Structured Cyclic Multilayer Zn-Ni Alloy Coatings Using Triangular Current Pulses. In: Электронная обработка материалов, 2011, nr. 2(47), pp. 16-23. ISSN 0013-5739.
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Электронная обработка материалов
Numărul 2(47) / 2011 / ISSN 0013-5739 /ISSNe 2345-1718

Development of Nano-Structured Cyclic Multilayer Zn-Ni Alloy Coatings Using Triangular Current Pulses

Pag. 16-23

Bhat Ramesh, Hegde A.
 
National Institute of Technology Karnataka
 
 
Disponibil în IBN: 27 martie 2017


Rezumat

Cyclic multilayer alloy (CMA) deposits of Zn-Ni were developed on mild steel from sulphate bath having thiamine hydrochloride (THC) and citric acid (CA) as additives. CMA coatings were developed galvanostatically using triangular current pulses, under different conditions of cyclic cathode current density (CCCD’s) and number of layers. The corrosion behaviors of the coatings were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy methods, and were compared with that of monolayer Zn-Ni alloy of same thickness. At optimal configuration, CMA coating represented as, (ZnNi)2.0/5.0/300 was found to exhibit ~ 40 times better corrosion resistance compared to monolayer alloy, (ZnNi)3.0. Cyclic voltammetry study demonstrated that THC and CA have improved the appearance of the deposit by complexation with metal ions. The corrosion protection efficacy of CMA coatings was attributed to the difference in phase structure of the alloy in successive layers, evidenced by XRD analysis. The formation of multilayer and corrosion mechanism was analyzed by Scanning Electron Microscopy (SEM) study.