Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (5): 585-598.DOI: 10.1007/s40195-018-0794-5
• Orginal Article • Previous Articles Next Articles
Zhu Wang1, Zi-Qiang Zhou2, Lei Zhang1(), Jia-Yuan Hu2, Zi-Ru Zhang1, Min-Xu Lu1
Received:
2018-05-10
Revised:
2018-06-20
Online:
2019-05-10
Published:
2019-05-27
Zhu Wang, Zi-Qiang Zhou, Lei Zhang, Jia-Yuan Hu, Zi-Ru Zhang, Min-Xu Lu. Effect of pH on the Electrochemical Behaviour and Passive Film Composition of 316L Stainless Steel[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(5): 585-598.
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C | Si | Mn | P | S | Cr | Mo | Ni | Fe |
---|---|---|---|---|---|---|---|---|
0.022 | 0.47 | 1.2 | 0.02 | 0.003 | 16.7 | 2.35 | 10 | Bal. |
Table 1 Chemical composition of 316L austenitic stainless steel (wt%)
C | Si | Mn | P | S | Cr | Mo | Ni | Fe |
---|---|---|---|---|---|---|---|---|
0.022 | 0.47 | 1.2 | 0.02 | 0.003 | 16.7 | 2.35 | 10 | Bal. |
Fig. 1 Cyclic polarization curves obtained for 316L stainless steel measured in NaCl solutions at ambient temperature under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 12, e pH 13, f pH 13.5
Fig. 2 SEM images of the 316L samples after the cyclic polarization tests conducted under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 13, e pH 13.5
Fig. 5 Passive current densities extracted from the polarization curves obtained for 316L stainless steel measured in NaCl solutions at ambient temperature under various pH conditions
pH | Rs (Ω) | Error (%) | Q f | Rf (kΩ) | Error (%) | |||
---|---|---|---|---|---|---|---|---|
Yo (Ω-1 cm-2 sn) | Error (%) | n | Error (%) | |||||
7 | 11.91 | 0.4 | 4.59 × 10-5 | 3.5 | 0.9 | 1.3 | 320.6 | 9.8 |
9 | 9.1 | 1.3 | 5.08 × 10-5 | 2.6 | 0.89 | 3.2 | 171.6 | 9.2 |
11 | 8.15 | 2.2 | 5.74 × 10-5 | 4.3 | 0.87 | 4.3 | 119.6 | 9.7 |
13 | 5.17 | 1.6 | 5.32 × 10-5 | 3.7 | 0.91 | 2.9 | 79.11 | 8.9 |
Table 2 Calculated equivalent circuit parameters
pH | Rs (Ω) | Error (%) | Q f | Rf (kΩ) | Error (%) | |||
---|---|---|---|---|---|---|---|---|
Yo (Ω-1 cm-2 sn) | Error (%) | n | Error (%) | |||||
7 | 11.91 | 0.4 | 4.59 × 10-5 | 3.5 | 0.9 | 1.3 | 320.6 | 9.8 |
9 | 9.1 | 1.3 | 5.08 × 10-5 | 2.6 | 0.89 | 3.2 | 171.6 | 9.2 |
11 | 8.15 | 2.2 | 5.74 × 10-5 | 4.3 | 0.87 | 4.3 | 119.6 | 9.7 |
13 | 5.17 | 1.6 | 5.32 × 10-5 | 3.7 | 0.91 | 2.9 | 79.11 | 8.9 |
Fig. 9 High-resolution XPS spectra of Cr 2p3/2 obtained on 316L stainless steel after the potentiostatic tests measured in NaCl solutions at ambient temperature under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 13
Fig. 10 High-resolution XPS spectra of Fe 2p3/2 obtained on 316L stainless steel after the potentiostatic tests measured in NaCl solutions at ambient temperature under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 13
Fig. 11 High-resolution XPS spectra of Mo 3d obtained on 316L stainless steel after the potentiostatic tests measured in NaCl solutions at ambient temperature under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 13
Fig. 12 High-resolution XPS spectra of O 1s obtained on 316L stainless steel after the potentiostatic tests measured in NaCl solutions at ambient temperature under various pH conditions: a pH 7, b pH 9, c pH 11, d pH 13
Fig. 13 Characteristic potentials extracted from the polarization curves obtained for 316L stainless steel measured in NaCl solutions at ambient temperature under various pH conditions
Fig. 15 Schematic diagrams of the potential variation during galvanostatic tests: a used for illustrating the galvanostatic plots measured at pH 7, 9 and 11; b used for illustrating the galvanostatic plot measured at pH 13
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