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Metals 2018, 8(9), 711; https://doi.org/10.3390/met8090711

Using the Multi-Response Method with Desirability Functions to Optimize the Zinc Electroplating of Steel Screws

1
Department of Mechanical Engineering, University of La Rioja, 26004 Logroño, La Rioja, Spain
2
Institute for Advanced Materials (INAMAT), Department of Mechanical Engineering, Public University of Navarre—UPNA, Campus Arrosadía S/N, 31006 Pamplona, Navarre, Spain
*
Author to whom correspondence should be addressed.
Received: 24 August 2018 / Revised: 3 September 2018 / Accepted: 5 September 2018 / Published: 11 September 2018
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Abstract

Zinc electroplating is a coating process controlled by several input process parameters. However, the commonly used input parameters for setting the process of zinc deposition are current density, temperature of the coating solution, zinc concentration, deposition time, and concentration of additives (conditioner and brightener). The power consumed in the zinc plating process, coating thickness, increase in coating mass, and corrosion resistance are considered to be outputs or zinc coating parameters. They are widely used when the zinc coating requirements are based on the coating process cost, coating process speed, corrosion resistance, and coating thickness. This paper seeks to determine regression models by the response surface method (RSM) that relate the zinc coating parameters to the input parameters in steel screws. When considering the coating requirements of cost, coating process speed, corrosion resistance, and coating thickness, the optimal input parameters were found by using a multi-response surface (MRS). Input parameters of 0.3 amps/dm2, 20.0 °C, 13.9 g/L, 45 min, 28.5 mL/L, and 2.8 mL/L, respectively (relative to the commonly used input parameters detailed above), were obtained when considering the cost. Considering minimization of the deposition time, the input parameters obtained were 0.5 amps/dm2, 24.6 °C, 13.9 g/L, 45 min, 26.9 mL/L, and 1.1 mL/L, respectively. The optimal inputs to maximize the corrosion resistance were 0.6 amps/dm2, 32.4 °C, 14.0 g/L, 45 min, 28.7 mL/L, and 2.5 mL/L, respectively. Finally, when maximizing the coating thickness, the inputs were 0.7 amps/dm2, 38.4 °C, 12.2 g/L, 45 min, 26.5 mL/L, and 1.5 mL/L, respectively. View Full-Text
Keywords: modeling and optimizing zinc electroplating in steel screws; experimental design; multi-response surface method (MRS); desirability functions modeling and optimizing zinc electroplating in steel screws; experimental design; multi-response surface method (MRS); desirability functions
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Lorza, R.L.; Calvo, M.Á.M.; Labari, C.B.; Fuente, P.J.R. Using the Multi-Response Method with Desirability Functions to Optimize the Zinc Electroplating of Steel Screws. Metals 2018, 8, 711.

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