Study on effects of technological factors on fabrication and modification of Zn plating
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https://doi.org/10.54939/1859-1043.j.mst.81.2022.105-111Keywords:
S10C steel; Zinc phosphate conversion plating; Zn plating; Zinc plating structure.Abstract
This work presents research on the effects of current density and fabrication time on Zn coating from a solution containing 65 g/L ZnO, 120 g/L NaCN, 5 g/L Na2S, 20 g/L NaOH and 5 g/L glycerol. Results showed that at cathode current density ic = 1 ¸ 3 A/dm2, coating time 30 ¸ 60 minutes, and solution temperature 25 ¸ 30 ℃, the obtained coating had a smooth, glossy surface and bright color. Coated sample was subsequently modified in BT-30HL solution for 10 ¸ 60 seconds, at a temperature of 25 ¸ 30 ℃ to achieve passivated coating, containing small and homogeneous phosphate salt crystals distributed evenly on the surface. The passivated zinc coating layer had high corrosion resistance, and was able to withstand a salt mist environment according to TCVN 7699-2-52:2007 standard at harsh level 3, corrosion rate was very minor, at 0.0162 mm/year.
References
[1]. LindaWing, “A solution to reducing the cost of acid zinc plating”, Metal Finishing, Volume 107, Issue 4, pp. 26, 28-30, (2009). DOI: https://doi.org/10.1016/S0026-0576(09)00018-X
[2]. Y. Liu, X. Zhou, “An organic coating pigmented with strontium aluminiumpolyphosphate for corrosion protection of zinc alloy coated steel”, Progress in Organic Coatings 102, pp. 29-36, (2017). DOI: https://doi.org/10.1016/j.porgcoat.2016.02.020
[3]. O. Oluwole, D. T. Oloruntoba, O. Awheme, “Effect of zinc plating of low carbon steel on corrosion resistance in cocoa fluid environment”, Materials & Design, Vol. 29, Issue 6, pp. 1266-1274, (2008). DOI: https://doi.org/10.1016/j.matdes.2007.05.002
[4]. Roland Tolulope, Cleophas Akintoye, Marvellous Akinyele, “Effect of ginger, pomegranate and celery extracts on zinc electrodeposition, surface morphology and corrosion inhibition of mild steel”, Alexandria Engineering Journal, Volume 59, Issue 2, pp. 933-941, (2020). DOI: https://doi.org/10.1016/j.aej.2020.03.014
[5]. D O. Flamini, S. B. Saidman, J. B. Bessone, “Electrodepposition of galilium and zinc onto alumium. Influence of the electrodeposited metals on the activation process”, Thin Solid Films 515, pp. 7880-7885, (2015). DOI: https://doi.org/10.1016/j.tsf.2007.04.016
[6]. Chen Ze-min, Lu Pin, Jia Yan, “Mechanism of Zinc Phosphating Solution at Low Temperature”, Advanced Materials Reseacrch Vols. 530-504, pp 437-440, (2012). DOI: https://doi.org/10.4028/www.scientific.net/AMR.503-504.437
[7]. Swaidani AM, “Modified zinc phosphate coating a promising approach to enhance the anti-corrosion properties of reinforcing steel”, MOJ Civil Engineering, Volume 3, Issue 5, pp. 370-374, (2017). DOI: https://doi.org/10.15406/mojce.2017.03.00083
[8]. Nguyen Thi Huong et al, “The Corrosion Resistance of Trivalent Chrome Conversion Coating on Zinc Electroplated Steel in Accelerated Test Conditions and After Natural Exposure”, Elixir Corrosion & Dye 134, pp. 53580-53587, (2019).
[9]. Florica Simescu, Hassane Idrissi, “Corrosion behaviour in alkaline medium zinc phosphate coated steel obtained by cathodic electrochemical treatment”, Corrosion Science 52, pp. 883-840, (2009). DOI: https://doi.org/10.1016/j.corsci.2009.01.010
[10]. Hongxia Wan, Dongdong Song, Xiaagang Li. “Effect of Zinc Phosphate on the Corrosion Behavior of Waterborne Acrylic Coating/Metal Interface”, Materials, 10, 654, (2017). DOI: https://doi.org/10.3390/ma10060654
