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Study on the electrochemical behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti)

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Abstract

The electrochemical corrosion behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k (Ti-22k) gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti) was studied. Elemental Ti was added as the quaternary element to 22k gold by replacing Ag, resulting in the formation of secondary phase precipitates during age hardening treatment, thereby improving the hardness of the alloy. Anodic polarization tests were conducted for both 22k and Ti-22k samples in their as-cast annealed, cold-rolled annealed and age-hardened conditions using 0.9% sodium chloride and 1% lactic acid as medium. The as-cast and annealed 22k samples showed better corrosion resistance in both corrosion media whereas the 22k samples in the cold-rolled, annealed condition and Ti-22k samples in the as-cast, annealed condition showed poor corrosion resistance. After age-hardening treatment, cold-rolled Ti-22k samples showed better corrosion resistance due to the formation of passive layer (of TiO2) on the surface. However, corrosion gets initiated in the age-hardened Ti-22k due to the breaking and decomposition of the passive layer (TiO2) at a potential > 1.3 V.

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Acknowledgements

The authors profoundly thank Mr. Santhosh Srinivas, Mr. Sanjay Renewade, Mr. S. Seshadri and Mr. Raghothaman and the entire Jewelry Division (TANISHQ) of Titan Company Ltd. Hosur, India, for supplying gold for this project.

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Authors and Affiliations

  1. SRM Institute of Science and Technology, SRM Research Institute, Kattankulathur, Chennai, Tamilnadu, 603203, India

    K. M. Saradesh, Indrajit Patil & Bhalchandra Kakade

  2. Centre for Automotive Energy Materials, International Advanced Research Centre, Chennai, India

    D. Sivaprahasam

  3. Department of Mechanical Engineering, SRM University-AP, Amaravati, Andhra Pradesh, 522502, India

    G. S. Vinodkumar

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  1. K. M. Saradesh
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  2. Indrajit Patil
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  3. D. Sivaprahasam
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  4. Bhalchandra Kakade
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  5. G. S. Vinodkumar
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Correspondence to G. S. Vinodkumar.

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Saradesh, K.M., Patil, I., Sivaprahasam, D. et al. Study on the electrochemical behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti). Gold Bull 52, 175–183 (2019). https://doi.org/10.1007/s13404-019-00263-z

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  • DOI: https://doi.org/10.1007/s13404-019-00263-z

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