Experimental Design for Optimization of Conditions Affecting Over-Standard Paint Thickness in Car Hood Electrodeposition Process
10.14416/j.ind.tech.2026.08.008
Keywords:
Electrodeposition painting, Box-Behnken Design, Submission procedure, Paint thicknessAbstract
The objective of this research is to determine the optimal conditions for the electrodeposition (ED) painting process of car hoods to address the issue of over-standard paint thickness, which adversely affects product quality and production costs. This study applies the Box-Behnken Design to investigate factors influencing the occurrence of over-standard paint thickness. The three key factors examined include voltage (250–300 V), temperature (32–35 °C), and biocide concentration (200–400 L). The experimental results indicate that all three factors are statistically significant at a 95% confidence level. Through mathematical modeling and optimization, the optimal conditions were found to be a voltage of 252 V, a temperature of 32 °C, and a biocide concentration of 345 L. Confirmatory experiments were conducted to validate the accuracy of the mathematical model by comparing actual experimental values with predicted values. The results showed a percentage error of 1.32%, which is within the 5% limit. This demonstrates that the optimal conditions for the ED painting process of car hoods derived from the mathematical model are reliable and suitable for practical application.
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