## 3 Results and Discussion
### Influence of Deposition Time and Degreasing Temperature on Coating Characteristics  
Figure 6 illustrates the effect of KTL deposition time and the degreasing solution temperature, along with voltage variation, on the resulting layer thickness. These factors consistently lead to an increase in layer thickness. As the degreasing temperature decreases, the rate of layer growth also diminishes. The difference between the maximum and minimum thickness remains constant across the three voltage changes. For a KTL time of 3 min, this difference is 3.45 \(\upmu\)m, while for a 7 min deposition, it is 1.72 \(\upmu\)m. The thickness variation with a gradual change in temperature over a 3 min KTL period is 0.87 \(\upmu\)m, and for a 7 min deposition, it is 0.47 \(\upmu\)m. At an applied voltage of 200 V, the minimum thickness of 14.98 \(\upmu\)m after 3 min is achieved with a degreasing temperature of 80 \(\lx@math@degree\)C. The maximum thickness of 18.43 \(\upmu\)m occurs with minimal degreasing at 40 \(\lx@math@degree\)C. At this lower temperature, the maximum layer thickness of 21.78 \(\upmu\)m is reached after 7 min of deposition. When the voltage is increased to 250 V, the smallest thickness of 16.48 \(\upmu\)m is again observed at a degreasing temperature of 80 \(\lx@math@degree\)C. At this temperature, a minimum thickness of 20.18 \(\upmu\)m is  
Figure 5: The influence of KTL deposition time and KLT voltage on the change of the formed layer at the maximum values of the design of experiments methodology. also reached when the deposition time is extended to 7 min. The maximum thickness is achieved at a degreasing temperature of 40 \({}^{\circ}\)C throughout the entire KTL deposition period. At 300 V, the highest thickness values are recorded, with the difference between 250 V at 80 \({}^{\circ}\)C and a deposition time of 3 min being 1.49 \(\upmu\)m. However, for a 7 min KTL deposition, this difference is reduced to only 0.11 \(\upmu\)m. The maximum thicknesses are achieved with degreasing at 40 \({}^{\circ}\)C, with a thickness of 21.42 \(\upmu\)m after 3 min and 22.02 \(\upmu\)m after 7 min. Figure 7 illustrates the relationship between the KTL deposition time, degreasing temperature, and voltage variation and their combined effect on the resulting layer thickness. At a voltage of 200 V, the minimum thickness of 12.23 \(\upmu\)m is observed at a degreasing temperature of 80 \({}^{\circ}\)C. At this temperature, the thickness increases over time, and around 4.8 min of KTL deposition, the layers intersect, resulting in maximum values of 17.30 \(\upmu\)m after 7 min of deposition. The maximum thickness of 14.89 \(\upmu\)m, recorded after 3 min of deposition, occurs at a degreasing temperature of 40 \({}^{\circ}\)C. When the thickness reaches approximately 14.57 \(\upmu\)m, the graph intersects, indicating that this degreasing temperature reaches the minimum thickness values. After 7 min of deposition, the thickness measures 14.12 \(\upmu\)m. Only at this temperature does the thickness decrease with increasing deposition time. When the voltage is raised to 250 V, the smallest thickness, 13.72 \(\upmu\)m, is observed at a degreasing temperature of 80 \({}^{\circ}\)C. This temperature, along with increasing time, contributes to an increase in thickness, and at around 4.75 min, it intersects with other degreasing temperatures, reaching the maximum layer thickness. After 7 min, the thickness reaches 17.42 \(\upmu\)m. A rising trend in layer formation is also observed at degreasing temperatures of 60 \({}^{\circ}\)C and 70\({}^{\circ}\)C. However, at a degreasing temperature of 50 \({}^{\circ}\)C, the layer thickness decreases as time increases. At 40 \({}^{\circ}\)C, a maximum thickness of 16.39 \(\upmu\)m is achieved at 3 min of KTL deposition. At the point where the graphs intersect, the thickness is approximately 15.40 \(\upmu\)m. The smallest thickness of 14.24 \(\upmu\)m is recorded after 7 min of deposition.