Table 1
Chemical composition of 30HGSA grade steel.
| C (%) | Mn (%) | Si (%) | S (%) | P (%) | Cr (%) | Ni (%) |
|---|---|---|---|---|---|---|
| 0.25–0.35 | 0.8–1.2 | 0.8–1.2 | ≤0.025 | ≤0.025 | 0.8–1.2 | ≤0.4 |
Figure 1
(a) Technological scheme of SX-600 (1 – metallizer body; 2 – wire feeding mechanism; 3 – air supply channel; 4 – electrode wires; 5 – electric arc with sprayed wire particles; 6 – sprayed coating), (b) appearance of the gun, and (c) appearance of the supersonic EAM complex.
Table 2
Regimes of 30HGSA coating application by EAM.
| Sample | Voltage (V) | Current (A) | Wire feed speed (cm/s) | Compressed air pressure (atm) | Spraying distance (mm) | Number of samples |
|---|---|---|---|---|---|---|
| No. 1 | 100 | 4 | 8 | 150 | 3 | |
| No. 2 | 43 | 200 | 8 | 3 | ||
| No. 3 | 300 | 16 | 3 |
Figure 2
Microstructure and elemental analysis of coatings: (a) No. 1, (b) No. 2, and (c) No. 3.
Figure 3
Results of X-ray diffraction analysis: No. 1, No. 2, and No. 3.
Figure 4
Surface morphology and roughness measurement results of coatings: (a) No. 1, (b) No. 2, and (c) No. 3.
Figure 5
Images of micropores obtained using ImageJ software package: (a) No. 1, (b) No. 2, and (c) No. 3.
Table 3
Porosity values of the obtained coatings.
| Sample | Average pore size (nm) | Porosity percentage (%) |
|---|---|---|
| No. 1 | 45.474 | 2.536 |
| No. 2 | 20.028 | 1.776 |
| No. 3 | 19.060 | 1.018 |
Figure 6
Results of hardness measurement: No. 1, No. 2, and No. 3.
Figure 7
Polarization curves obtained from electrochemical corrosion tests on samples. Tafel extrapolation diagram of electrochemical corrosion measurements at different quenching rates on mild steel samples. E corr: corrosion potential, i corr: corrosion current rate.
Table 4
Corrosion parameters of the samples.
| Sample | Corrosion current I к (µA/cm2) | Free corrosion potential E к (V) | Corrosion rate (mm/year) |
|---|---|---|---|
| Steel 45 | 3.3807 × 10−5 | 0.492 | 0.3966 |
| 1 | 3.484 × 10−5 | 0.43016 | 0.40872 |
| 2 | 2.1462 × 10−5 | 0.46569 | 0.25178 |
| 3 | 1.0961 × 10−5 | 0.43251 | 0.12859 |
Figure 8
Tribological test results: (a) friction coefficients and (b) wear volume.
Figure 9
SEM images of a worn surface: (a) No. 1, (b) No. 2, and (c) No. 3.