Open Access
Ramesh S. Bhat,
- Associate Professor Department of Chemistry, NMAM Institute of Technology Karnataka India
Abstract
The anti-corrosive three binary (Zn-Ni, Zn-Co, Zn-Fe) and two ternary (Zn-Ni-Co, Zn-Co-Fe) alloy coating films on mild steel from acid chloride bath using sulphanilic acid and gelatin as additives for the electroplating technique. The normal Hull cell method was used to optimize the bath compositions, temperature and pH of the bath solutions for coating performance against corrosion. The cause of current density (CD) on metal weight percentage (M = Ni, Co, Fe), thickness (t), hardness (VH), and throwing power (TP) has been investigated. The corrosion resistance of binary and ternary alloy coating films was determined using the potentiodynamic polarization technique. The metal content in the coatings were determined by colorimetric method. Under optimal conditions, the corrosion rate of Zn-Ni-Co was approximately ~8 times, ~10 times higher than Zn-Ni, and Zn-Co coating films. Also Zn-Co-Fe coating film was approximately ~8 times, and ~13 times higher than Zn- Co and Zn-Fe coating films. Thus ternary zinc-nickel-cobalt and zinc-cobalt-iron coatings can replace usual binary alloy deposits for many industrial applications such as automobile, machinery items like tools, bolts, and nuts, etc.
Keywords: Additive, Thickness, Corrosion ,Zinc-based alloy coatings ,Co-deposition ,Hull cell
References
1. Xiang T, Han Y, Guo Z, Wang R, et al. Fabrication of inherent anticorrosion super hydrophobic surfaces on metals. ACS Sustainable Chemistry & Engineering. 2018 6 (4): 5598–606.
2. Thangaraj V, Hegde A C. Electrode position and compositional behaviour of Zn-Ni alloy. Indian J. Chem. Technol. 2007; 14: 246–252.
3. Bhat RS, Bekal S, Hegde AC, Fabrication of Zn-Ni alloy coatings from acid chloride bath and its corrosion performance. Anal. Bioanal. Electrochem. 2018; 10 (12): 1562–1573.
4. Panagopoulos CN, Lagaris DA, Vatista PC. Adhesion and corrosion behaviour of Zn–Co electrodeposits on mild steel. Mater. Chem. Phys. 2011; 126: 398–403.
5. Bhat RS, Hegde AC. Corrosion behavior of Zn-Co alloy coating from acid sulphate bath. Anal. Bioanal. Electrochem. 2014; 6 (5): 606–622.
6. Karahan H. A study on electrodeposited Zn1− x Fe x alloys. J. Mater. Sci. 2007; 42: 10160–10163. 7. Bhat RS, Bhat KU, Hegde AC. Optimization of deposition conditions for bright Zn-Fe coatings and its characterization. Prot. Met. Phys. Chem. Surf. 2011; 47 (5): 645–653.
8. Dıaz SL, Mattos OR, Barcia O.E, et al. Zn-Fe anomalous electrodeposition: Stationaries and local pH measurements. Electrochim. Acta. 2002; 47: 4091–4100.
9. Lin CC, Huang CM. Zinc-Nickel alloy coatings electrodeposited by pulse current and their corrosion behavior. J. Coat. Technol. Res. 2006; 3: 99–104.
10. Blejan D, Bogdan D, Pop M, et al. Structure, Morphology and Corrosion Resistance of Zn-Ni-TiO2 composite Coatings. Optoelectron. Adv. Mater., Rapid Commun., 2011; 5: 25–29.
11. Bhat RS, and Hegde A C, Studies on electrodeposited Zn-Fe alloy coating on mild steel and its characterization. J. Electrochem. Sci. Eng. 2019; 9 (1): 9–16.
12. Brenner A. Electrodeposition of Alloys, Vol. II. Academic Press: New York; 1963.
13. Younan MM. Surface Microstructure and Corrosion Resistance of Electrodeposited Ternary Zn-Ni-Co Alloy. J. Appl. Electrochem. 2000; 30: 55–60.
14. Eliaz N, Venkatakrishna K, Hegde A C. Electroplating and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co alloys. Surf. Coat. Technol. 2010; 205: 1969–1978.
15. Hegde AC, Venkatakrishna K, Eliaz N. Electrodeposition of Zn–Ni, Zn–Fe and Zn–Ni–Fe alloys. Surf. Coat. Technol. 2010; 205 (7): 2031–2041.
16. Abou-Krisha MM, Assaf FH, El-Naby SA. Electrodeposition behavior of zinc–nickel–iron alloys from sulfate bath. J. Solid. State. Electrochem. 2009; 13: 879–885.
17. Bhat RS, Bhat UK, Hegde AC. Corrosion Behavior of Electrodeposited Zn-Ni, Zn-Co and Zn-Ni-Co Alloys. Anal. Bioanal. Electrochem. 2011; 3 (3): 302–315.
18. Bhat RS, Hegde AC. Optimization of bright Zn-Co-Ni alloy coatings and its characterization. Anal. Bioanal. Electrochem., 2013; 5 (5): 609–621.
19. Hoen-Velterop L, Lohdi ZF, Mol JMC, et al. Corrosion resistance of Zn–Co–Fe alloy coatings on high strength steel. Surf. Coat. Technol. 2009; 203 (10–11): 1415–1422.
20. Bhat RS, Manjunatha KB, Prasanna Shankara R, Venkatakrishna K, et al. Electrochemical studies on the corrosion resistance of Zn–Ni–Co coating from acid chloride bath. Applied Physics A. 2020; 126: 772.
21. Vogel AI. Quantitative Inorganic Analysis, Longmans Green and Co London (1951).
22. Bhat RS, Shet VB. Development and characterization of Zn–Ni, Zn–Co and Zn–Ni–Co coatings. Surf. Eng. 2020; 36 (4): 429–437.
23. Bhat RS, Hegde AC. Electroplating and corrosion study of Zn-Co, Zn-Fe and Zn-Co-Fe alloys. Anal. Bioanal. Electrochem. 2012; 4 (6): 593–609.
Journal of Thin Films, Coating Science Technology & Application
| Volume | |
| Received | November 9, 2021 |
| Accepted | December 20, 2021 |
| Published | January 7, 2023 |