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Influence of high-speed arc metallization wire feed rate on tribological and corrosion properties of 30HGSA steel coatings

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31 dic 2024

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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.
(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.

Figure 2

Microstructure and elemental analysis of coatings: (a) No. 1, (b) No. 2, and (c) No. 3.
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.
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.
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.
Images of micropores obtained using ImageJ software package: (a) No. 1, (b) No. 2, and (c) No. 3.

Figure 6

Results of hardness measurement: No. 1, No. 2, and No. 3.
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.
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.

Figure 8

Tribological test results: (a) friction coefficients and (b) wear volume.
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.
SEM images of a worn surface: (a) No. 1, (b) No. 2, and (c) No. 3.

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

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

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

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