J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (8): 1419-1427.DOI: 10.1016/j.jmst.2017.11.028
Special Issue: Corrosion in 2018
• Orginal Article • Previous Articles Next Articles
Jiazhen Wangab, Jianqiu Wanga(), Hongliang Minga, Zhiming Zhanga, En-Hou Hana
Received:
2017-07-26
Revised:
2017-11-07
Accepted:
2017-11-09
Online:
2018-08-17
Published:
2018-08-22
Jiazhen Wang, Jianqiu Wang, Hongliang Ming, Zhiming Zhang, En-Hou Han. Effect of temperature on corrosion behavior of alloy 690 in high temperature hydrogenated water[J]. J. Mater. Sci. Technol., 2018, 34(8): 1419-1427.
Ni | Cr | Fe | Mn | Ti | S | P | C | N | Si | Cu | Co | Al |
---|---|---|---|---|---|---|---|---|---|---|---|---|
59.50 | 29.02 | 10.28 | 0.30 | 0.33 | 0.001 | 0.009 | 0.018 | 0.0234 | 0.31 | 0.010 | 0.015 | 0.16 |
Table 1 Chemical composition of Alloy 690 tubes (wt%).
Ni | Cr | Fe | Mn | Ti | S | P | C | N | Si | Cu | Co | Al |
---|---|---|---|---|---|---|---|---|---|---|---|---|
59.50 | 29.02 | 10.28 | 0.30 | 0.33 | 0.001 | 0.009 | 0.018 | 0.0234 | 0.31 | 0.010 | 0.015 | 0.16 |
Fig. 8. STEM image (a) and EDS mapping of the oxide film for Alloy 690 after 288 h exposure in high temperature water at 250 °C: (b) O mapping; (c) Cr mapping; (d) Ni mapping; (e) Fe mapping.
Fig. 9. STEM image (a) and EDS mapping of the oxide film for Alloy 690 after 288 h exposure in high temperature water at 300 °C: (b) O mapping; (c) Cr mapping; (d) Ni mapping; (e) Fe mapping.
Temperature (°C) | Rs (Ω cm2) | Cdl (mF cm-2) | Rct (Ω cm2) | W (Ss0.5 cm-2) | Cf (mF cm-2) | Rf (Ω cm2) |
---|---|---|---|---|---|---|
200 | 2490.3 | 5.83 | 223.7 | 0.074 | 0.41 | 159.5 |
225 | 2313.3 | 5.31 | 115.8 | 0.124 | 0.56 | 69.3 |
250 | 2265.6 | 4.52 | 107.1 | 0.129 | 0.52 | 62.3 |
275 | 2001.4 | 5.95 | 133.4 | 0.161 | 0.49 | 83.0 |
288 | 1930.4 | 1.23 | 188.9 | 0.019 | 4.43 | 587.8 |
300 | 1876.7 | 1.06 | 252.7 | 0.005 | 2.53 | 2845.5 |
Table 2 EIS fitting results for Alloy 690 at different temperatures by the equivalent circuit in Fig. 11.
Temperature (°C) | Rs (Ω cm2) | Cdl (mF cm-2) | Rct (Ω cm2) | W (Ss0.5 cm-2) | Cf (mF cm-2) | Rf (Ω cm2) |
---|---|---|---|---|---|---|
200 | 2490.3 | 5.83 | 223.7 | 0.074 | 0.41 | 159.5 |
225 | 2313.3 | 5.31 | 115.8 | 0.124 | 0.56 | 69.3 |
250 | 2265.6 | 4.52 | 107.1 | 0.129 | 0.52 | 62.3 |
275 | 2001.4 | 5.95 | 133.4 | 0.161 | 0.49 | 83.0 |
288 | 1930.4 | 1.23 | 188.9 | 0.019 | 4.43 | 587.8 |
300 | 1876.7 | 1.06 | 252.7 | 0.005 | 2.53 | 2845.5 |
Time (h) | Rs (Ω cm2) | Cdl (mF cm-2) | Rct (Ω cm2) | W (Ss0.5 cm-2) | Cf (mF cm-2) | Rf (Ω cm2) |
---|---|---|---|---|---|---|
48 | 1960.7 | 0.61 | 100.6 | 0.089 | 7.52 | 135.0 |
96 | 1957.2 | 0.95 | 99.1 | 0.090 | 6.88 | 127.5 |
168 | 1937.0 | 1.05 | 138.7 | 0.045 | 4.84 | 248.9 |
240 | 1932.7 | 1.13 | 185.7 | 0.027 | 5.08 | 405.5 |
288 | 1930.4 | 1.23 | 188.9 | 0.019 | 4.43 | 587.8 |
Table 3 EIS fitting results for Alloy 690 after different immersion time at 288 °C by the equivalent circuit in Fig. 11.
Time (h) | Rs (Ω cm2) | Cdl (mF cm-2) | Rct (Ω cm2) | W (Ss0.5 cm-2) | Cf (mF cm-2) | Rf (Ω cm2) |
---|---|---|---|---|---|---|
48 | 1960.7 | 0.61 | 100.6 | 0.089 | 7.52 | 135.0 |
96 | 1957.2 | 0.95 | 99.1 | 0.090 | 6.88 | 127.5 |
168 | 1937.0 | 1.05 | 138.7 | 0.045 | 4.84 | 248.9 |
240 | 1932.7 | 1.13 | 185.7 | 0.027 | 5.08 | 405.5 |
288 | 1930.4 | 1.23 | 188.9 | 0.019 | 4.43 | 587.8 |
Fig. 14. Schematic of the modified double-layer oxide model at different temperatures after 288 h immersion: (a), (b) at 200-250 °C; (c), (d) at 275-300 °C.
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