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Corrosion resistance of PPTA Ni-based hardfacing layers

Monika Górnik

Monika Górnik

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wrocław University of Science and TechnologyWrocław, Poland
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Górnik, Monika
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Marzena Lachowicz

Marzena Lachowicz

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wrocław University of Science and TechnologyWrocław, Poland
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Lachowicz, Marzena
 and 
Leszek Łatka

Leszek Łatka

Department of Metal Forming, Welding and Metrology, Faculty of Mechanical Engineering, Wrocław University of Science and TechnologyWrocław, Poland
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Łatka, Leszek
  
Dec 31, 2024
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Article Category: Research Article
Published Online: Dec 31, 2024
Page range: 66 - 78
Received: Aug 08, 2024
Accepted: Nov 13, 2024
DOI: https://doi.org/10.2478/msp-2024-0040
Keywords
© 2024 the Monika Górnik et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

OM images after 3% nital etching of the interface line (cross-section): reference material S1 (a), S2 (b and c), S3 (d and e), and S4 (f and g).
OM images after 3% nital etching of the interface line (cross-section): reference material S1 (a), S2 (b and c), S3 (d and e), and S4 (f and g).

Figure 2

Cross-sections of the hardfacing layers at lower magnifications (200×) (S2 (a), S3 (c), and S4 (e)) and higher magnifications (500×) (S2 (b), S3 (d), and S4 (f)).
Cross-sections of the hardfacing layers at lower magnifications (200×) (S2 (a), S3 (c), and S4 (e)) and higher magnifications (500×) (S2 (b), S3 (d), and S4 (f)).

Figure 3

Top view SEM images of tested materials before the electrochemical corrosion (S2 (a), S3 (c), and S4 (e)) and after the process (S2 (b), S3 (d), and S4 (f)); magnification: 1,000×.
Top view SEM images of tested materials before the electrochemical corrosion (S2 (a), S3 (c), and S4 (e)) and after the process (S2 (b), S3 (d), and S4 (f)); magnification: 1,000×.

Figure 4

SEM images of the cross-section of S2 (a), S3 (c), and S4 (e) samples. EDS spectra of the characteristic obtained from the surface of S2 (b), S3 (d), and S4 (f) samples.
SEM images of the cross-section of S2 (a), S3 (c), and S4 (e) samples. EDS spectra of the characteristic obtained from the surface of S2 (b), S3 (d), and S4 (f) samples.

Figure 5

Representative potentiodynamic polarization curves of hardfacing layers examined in 3.5% NaCl solution.
Representative potentiodynamic polarization curves of hardfacing layers examined in 3.5% NaCl solution.

Figure 6

SEM images of the cross-section of the corroded surface of coatings: (a) S1, (b) S2, (c) S3, and (d) S4.
SEM images of the cross-section of the corroded surface of coatings: (a) S1, (b) S2, (c) S3, and (d) S4.

Figure 7

Average values of the roughness parameter measured with the stylus profilometer.
Average values of the roughness parameter measured with the stylus profilometer.

Chemical composition of S235JR steel (in wt%) [33]_

C Mn P S Cu N Fe
0.17 1.40 0.035 0.035 0.55 0.012 Bal.

Chemical composition of feedstock powders (material no_ from Table 1)_

Feedstock Elemental content (wt%)
C Si Cr B Ni Mo Cu Fe W
S1 0.03 — 18.00 — 13.00 2.7 — bal. —
S2 0.95 3.80 16.50 3.30 Bal. — — — —
S3 2.35 3.80 16.50 3.30 Bal. — — — 25.00
S4 0.50 4.00 16.00 4.00 Bal. 3.0 3.0 — —

Parameters used for hardfacing of the overlays_

Sample code Parameters
Current intensity (A) Torch speed (mm/s) Powder feed rate (g/min)
S1 100 0.8 9.7
S2 80 0.8 9.0
S3 100 1.6 11.0
S4 80 0.8 9.0

Electrochemical parameters obtained for all samples_

Sample code E OC (mV) E corr vs Ag/AgCl (mV) I corr (µA/cm2) R p (kΩ cm2) E p (mV)
Average result
S1 −87.8 −159.7 0.1 213.7 845
S2 −262.0 −290.9 0.3 108.8 535
S3 −234.9 −237.1 0.2 146.8 483
S4 −194.4 −200.3 0.1 210.0 438

Sample code and the PSD of powders [32]_

Feedstock material Sample code PSD (μm)
316L S1 −150 + 45
NiCrBSi S2 −125 + 45
NiCrBSi + 35 wt% WC S3 −125 + 22
NiCrCuMo S4 −125 + 45
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