Corrosion resistant electrodeposited zinc coating from zinc dross

Singh, M N and Basu, D K and Bhattamishra, A K and Narang, S K (2002) Corrosion resistant electrodeposited zinc coating from zinc dross. In: CORCON 2001, 28-30 Nov 2002, Goa.

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Electrodeposition of metals from aqueous solution produces a variety of metal alloy coatings. Zincalloy coatings are obtained by electrogalvanising of pure zinc. Properties of electrogalvanised steellike corrosion resistance spot weldability and adhesion are superior to hot-dip galvanisedsteel.Inthe present investigation, an attempt has been made to study electrodeposition of zinc from solidzinc drossas ananodic material on steel sheet acting as cathode and an aqueous bath containingdifferent concentration of Cl- ions, ammoniumsaltsandconducting substances at roomtemperature. An acid chloride bath was mainly used at different pH values. Very thin adherentand impervious coating was obtained on steel sheet. The zinc coating so obtained byelectrodepositionwas finally passivated to minimize white rust. X- ray diffraction, coatingthickness, atmospheric exposure test, electrochemical test, microhardness and cathodic efficiencyof zinc coated substrates were carried out. Salt -spray test on the coating was performed for 15days. Polarization experiments were carried out in 3.5 %NaCl solutionusingEG&G PARC-273Amodel Potentiostat Galvanostat. Open circuit potential (OCP) and corrosion potential (Ecorr) wererecorded. The process developed is very simple, economically viable and eco-friendly.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Zinc coating; Zinc dross; Corrosion resistant
Divisions:Corrosion and Surface Engineering
ID Code:1888
Deposited On:07 Oct 2010 09:27
Last Modified:26 Dec 2011 14:30
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