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Cr-Ni Alloy Electrodeposition and Comparison with Conventional Pure Cr Coating Technique

Moniruzzaman, M. and Rakib, M. M. and Matin, F. T. (2012) Cr-Ni Alloy Electrodeposition and Comparison with Conventional Pure Cr Coating Technique. International Journal of Automotive and Mechanical Engineering (IJAME), 6 (Jul. pp. 692-700. ISSN 2229-8649 (Print); 2180-1606 (Online)

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Cr coating is widely used as the outer surface of precision parts due to its attractive appearance and superior corrosion resistance properties. It is obtained by electrodeposition via a conventional bath with hexavalent Cr ions. This manufacturing technique has many drawbacks, such as very low efficiency and high operating temperature and it is hazardous to health. In this work, we studied a Cr-Ni alloy deposition technique and compared the alloy coating properties to those with conventional Cr coating. Sequential two-step alloy electrodeposition was also compared. We took varying concentrations of Cr, Ni and complexing agents for the electrodeposition of Cr-Ni alloy and sequential Cr-Ni alloy coating on mild steel. Operating parameters, i.e. current density and temperature, were varied to examine their effects on the coating properties. The coatings thus obtained were characterized by visual observation, corrosion test, microhardness measurement, morphology and chemical analysis. The Cr-Ni alloy coating was found to be more corrosion resistant in 5% NaCl solution and harder than the pure Cr coating obtained by conventional electrodeposition. Toxic gas was produced in a much lower extent in the alloy coating than the conventional Cr coating technique. Again, the two-step Cr-Ni alloy coating was found better in terms of corrosion resistance as well as hardness compared to the Cr-Ni alloy coating. The process was also found to be much more environmentally friendly.

Item Type: Article
Additional Information: Please click to official link
Uncontrolled Keywords: Alloy electrodeposition, Conventional Cr coating, Sequential coating, Corrosion, Hardness
Subjects: T Technology > TS Manufactures
T Technology > TA Engineering (General). Civil engineering (General)
Faculty/Division: Unspecified
Depositing User: Noorul Farina Arifin
Date Deposited: 27 Feb 2013 01:40
Last Modified: 03 Mar 2015 08:01
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