J. Mater. Sci. Technol. ›› 2020, Vol. 37: 85-95.DOI: 10.1016/j.jmst.2019.05.071
• Research Article • Previous Articles Next Articles
C. Garcia-Cabezona*(), C. Garcia-Hernandezb, M.L. Rodriguez-Mendezb, F. Martin-Pedrosaa
Received:
2018-12-13
Revised:
2019-03-15
Accepted:
2019-05-17
Published:
2020-01-15
Online:
2020-02-10
Contact:
Garcia-Cabezon C.
C. Garcia-Cabezon, C. Garcia-Hernandez, M.L. Rodriguez-Mendez, F. Martin-Pedrosa. A new strategy for corrosion protection of porous stainless steel using polypyrrole films[J]. J. Mater. Sci. Technol., 2020, 37: 85-95.
C | Cr | Ni | Mo | Mn | Si | Cu | N | Fe | |
---|---|---|---|---|---|---|---|---|---|
Powder | 0.021 | 16.10 | 13.55 | 2.24 | 0.20 | 0.87 | 0.02 | - | Bal. |
Wrought | 0.040 | 17.32 | 10.85 | 2.00 | 1.36 | 0.34 | 0.33 | 0.034 | Bal. |
Table 1 Chemical composition (wt%) of water atomized austenitic 316?L SS powder and wrought AISI 316?L.
C | Cr | Ni | Mo | Mn | Si | Cu | N | Fe | |
---|---|---|---|---|---|---|---|---|---|
Powder | 0.021 | 16.10 | 13.55 | 2.24 | 0.20 | 0.87 | 0.02 | - | Bal. |
Wrought | 0.040 | 17.32 | 10.85 | 2.00 | 1.36 | 0.34 | 0.33 | 0.034 | Bal. |
Sample | Sintering density (g/cm3) | Porosity (%) |
---|---|---|
NFC | 6.77 | 13.00 |
NWC | 7.20 | 11.20 |
VFC | 6.90 | 11.94 |
Table 2 Densities and degree of porosity of the 316?L SS samples as a function of the sintering atmosphere and of cooling rate.
Sample | Sintering density (g/cm3) | Porosity (%) |
---|---|---|
NFC | 6.77 | 13.00 |
NWC | 7.20 | 11.20 |
VFC | 6.90 | 11.94 |
Fig. 2. PPy film deposition curves as a function of time by using (a) chrono-potentiometry at a current density of 0.02?mA/mm2 and (b) chrono-amperometry at a constant potential of 0.8 VAg/AgCl.
Fig. 5. Potentiodynamic polarization curves, in PBS solution, of (a) uncoated samples, (b) coated and uncoated NWC and NFC, (c) coated and uncoated WSS, and (d) all coated samples.
Sample | Corrosion potential (VSCE) | Corrosion current density (10-3 ?A/m2) |
---|---|---|
NFC | -0.346 | 11.48 |
NFC-PPy | -0.225 | 8.43 |
NWC | -0.307 | 6.74 |
NWC-PPy | -0.150 | 3.84 |
VFC | -0.200 | 4.45 |
VFC-PPy | -0.147 | 2.32 |
WSS | -0.238 | 4.17 |
WSS-PPy | -0.268 | 9.54 |
Table 3 Corrosion potential and corrosion current density calculated by Tafel analysis of samples in PBS solution.
Sample | Corrosion potential (VSCE) | Corrosion current density (10-3 ?A/m2) |
---|---|---|
NFC | -0.346 | 11.48 |
NFC-PPy | -0.225 | 8.43 |
NWC | -0.307 | 6.74 |
NWC-PPy | -0.150 | 3.84 |
VFC | -0.200 | 4.45 |
VFC-PPy | -0.147 | 2.32 |
WSS | -0.238 | 4.17 |
WSS-PPy | -0.268 | 9.54 |
Fig. 6. Electrochemical impedance spectra in the form of (a) Nyquist and (b) and (c) Bode plots of the uncoated samples in PBS solution. Results of the fitting to the equivalent electric circuit are included.
Fig. 7. Electrochemical impedance spectra in the form of (a) Nyquist and (b) and (c) Bode plots of coated samples in PBS solution. Results of the fitting to an equivalent electric circuit are included.
Sample | Rs (Ω cm2) | C1-C (10-4 sn Ω-1?cm-2) | C1-n | R1 (Ω cm2) | C2-C (10-4 sn Ω-1?cm-2) | C2-n | Rcorr (Ω cm2) | Ws-Rw (Ω cm2) | Ws-s (s) | Ws-n | χ2 (10-4) |
---|---|---|---|---|---|---|---|---|---|---|---|
WSS | 18.6 | 0.26 | 0.80 | 1848 | 1.80 | 0.45 | 4.7 | 90882 | 46.5 | 0.4 | 1.9 |
NWC | 9.5 | 1.80 | 0.54 | 13.4 | 48.0 | 0.49 | 155 | 3664 | 14 | 0.5 | 0.8 |
NFC | 7.4 | 4.10 | 0.69 | 48.1 | 29.8 | 0.50 | 180 | 1877 | 0.01 | 0.5 | 1.4 |
VFC | 14.3 | 2.25 | 0.71 | 260 | 15.53 | 0.44 | 169 | 2939 | 0.03 | 0.5 | 1.5 |
Table 4 EIS equivalent circuit parameters of uncoated samples.
Sample | Rs (Ω cm2) | C1-C (10-4 sn Ω-1?cm-2) | C1-n | R1 (Ω cm2) | C2-C (10-4 sn Ω-1?cm-2) | C2-n | Rcorr (Ω cm2) | Ws-Rw (Ω cm2) | Ws-s (s) | Ws-n | χ2 (10-4) |
---|---|---|---|---|---|---|---|---|---|---|---|
WSS | 18.6 | 0.26 | 0.80 | 1848 | 1.80 | 0.45 | 4.7 | 90882 | 46.5 | 0.4 | 1.9 |
NWC | 9.5 | 1.80 | 0.54 | 13.4 | 48.0 | 0.49 | 155 | 3664 | 14 | 0.5 | 0.8 |
NFC | 7.4 | 4.10 | 0.69 | 48.1 | 29.8 | 0.50 | 180 | 1877 | 0.01 | 0.5 | 1.4 |
VFC | 14.3 | 2.25 | 0.71 | 260 | 15.53 | 0.44 | 169 | 2939 | 0.03 | 0.5 | 1.5 |
Sample | Rs (Ω/cm2) | C1-C (μF/cm2) | C1-n | R1 (Ω/cm2) | Cdl-C (μF/cm2) | Cdl-n | Rcorr (Ω/cm2) | Ws-R (Ω/cm2) | Ws-S (s) | Ws-n | χ2 (10-5) |
---|---|---|---|---|---|---|---|---|---|---|---|
WSS-PPy | 12.3 | 13 | 0.9 | 3412 | 380 | 0.21 | 855 | 12156 | 0.4 | 0.6 | 4.0 |
NWC-PPy | 13.2 | 23 | 0.86 | 2781 | 230 | 0.27 | 1494 | 15681 | 0.5 | 0.5 | 4.1 |
NFC-PPy | 9.8 | 14 | 0.9 | 718 | 150 | 0.6 | 1614 | 22267 | 0.34 | 0.5 | 5.2 |
VFC-PPy | 11.9 | 1.5 | 0.9 | 3161 | 200 | 0.5 | 2060 | 53087 | 0.02 | 0.5 | 8.4 |
Table 5 EIS equivalent circuit parameters of coated samples.
Sample | Rs (Ω/cm2) | C1-C (μF/cm2) | C1-n | R1 (Ω/cm2) | Cdl-C (μF/cm2) | Cdl-n | Rcorr (Ω/cm2) | Ws-R (Ω/cm2) | Ws-S (s) | Ws-n | χ2 (10-5) |
---|---|---|---|---|---|---|---|---|---|---|---|
WSS-PPy | 12.3 | 13 | 0.9 | 3412 | 380 | 0.21 | 855 | 12156 | 0.4 | 0.6 | 4.0 |
NWC-PPy | 13.2 | 23 | 0.86 | 2781 | 230 | 0.27 | 1494 | 15681 | 0.5 | 0.5 | 4.1 |
NFC-PPy | 9.8 | 14 | 0.9 | 718 | 150 | 0.6 | 1614 | 22267 | 0.34 | 0.5 | 5.2 |
VFC-PPy | 11.9 | 1.5 | 0.9 | 3161 | 200 | 0.5 | 2060 | 53087 | 0.02 | 0.5 | 8.4 |
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