High temperature thermal treatment of Zn-10Nb₂O₅-10SiO₂ crystal coatings on mild steel

Figures & data

Table 1. Chemical composition and concentration for bath solution

Composition	Mass concentration (g/L)
ZnCl Nb2O5	75 10
KCl	50
Boric acid	10
SiO2	5 g-10 g
pH Voltage Time Tempt	4.8 1.27–1.85V 15 min 40°C

Table 2. Chemical composition of Zn-10Nb₂O₅-SiO₂ matrix

Sample Matrix	Time (min)	Weight Gain (g)	Coating Thickness (µm)	SiO2 Additive Concentration (g/L)
Zn-10Nb2O5	15	0.330	223.2	0
Zn-10Nb2O5-5SiO2	15	0.259	226.5	5
Zn-10Nb2O5-10SiO2	15	0.287	227.2	10

Figure 1. SEM/EDS obtained for Zn-10Nb₂O₅ electrodeposition.

Figure 2. SEM/EDS obtained for Zn-10Nb₂O₅-5SiO₂ electrodeposition.

Figure 3. SEM/EDS obtained for Zn-10Nb₂O₅-10SiO₂ electrodeposition.

Figure 4. AFM obtained for Zn-10Nb₂O₅ sample.

Figure 5. AFM obtained for Zn-10Nb₂O₅-5SiO₂ co-deposition.

Figure 6. AFM obtained for Zn-10Nb₂O₅-10SiO₂ co-deposition.

Figure 7. Optical micrographs obtained (a) Zn-10Nb₂O₅, (b) Zn-10Nb₂O₅-5SiO₂, (c) Zn-10Nb₂O₅-10SiO₂ after electrodeposition.

Figure 8. Optical micrographs obtained (a) Zn-10Nb₂O₅ (b) Zn-10Nb₂O₅-5SiO₂ (c) Zn-10Nb₂O₅-10SiO₂ after heat treatment.

Figure 9. Optical micrographs obtained: (a) Zn-10Nb₂O₅, (b) Zn-10Nb₂O₅-5SiO₂, (c) Zn-10Nb₂O₅-10SiO₂ after corrosion.

Figure 10. Micro-hardness behaviour of the coated composites.

Figure 11. Wear rate of the coated samples.