Corrosion behavior of Alloy 690 in aerated supercritical water

Zhong, Xiangyu; Han, En‐Hou; Wu, Xi

doi:10.1016/j.corsci.2012.10.001

Cited by 120 publications

(60 citation statements)

References 39 publications

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“…Although Alloy 690 shows excellent corrosion resistance in PWR environments, it may suffer from corrosion related degradation in high temperature and pressure water [5][6][7][8][9].…”

Section: Open Accessmentioning

confidence: 99%

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

Jeon

Song

Hur

2015

Metals

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Abstract:The galvanic corrosion behavior of Alloy 690 coupled with magnetite has been investigated in an alkaline solution at 30 °C and 60 °C using a potentiodynamic polarization method and a zero resistance ammeter. The positive current values were recorded in the galvanic couple and the corrosion potential of Alloy 690 was relatively lower. These results indicate that Alloy 690 behaves as the anode of the pair. The galvanic coupling between Alloy 690 and magnetite increased the corrosion rate of Alloy 690. The temperature increase led to an increase in the extent of galvanic effect and a decrease in the stability of passive film. Galvanic effect between Alloy 690 and magnetite is proposed as an additional factor accelerating the corrosion rate of Alloy 690 steam generator tubing in secondary water.

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“…Although Alloy 690 shows excellent corrosion resistance in PWR environments, it may suffer from corrosion related degradation in high temperature and pressure water [5][6][7][8][9].…”

Section: Open Accessmentioning

confidence: 99%

Galvanic Corrosion between Alloy 690 and Magnetite in Alkaline Aqueous Solutions

Jeon

Song

Hur

2015

Metals

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“…For above-mentioned Inconel 600 and Incoloy 825, the scales obtained in sulfidecontaining SCW presented significant difference with those formed on general nickel-based alloys tested in SCW with/without oxygen [7,9,[23][24][25][26][27]. The latter scales generally showed a duplex oxide structure with Ni and Fe rich in the outer layer, and Cr rich in the inner layer.…”

Section: Discussionmentioning

confidence: 98%

“…The water molecules reached the inner surface of the external Ni 3 S 2 generally dissociated into oxygen and hydrogen. The oxygen in the form of O 2-diffused inward continuously and reacted with metal to produce metal oxides, which composited to chromium-rich spineltype phase [7,[43][44][45]. The sulfur diffusing inward through the inner layer to form sulfides, derived the dissociation of H 2 S molecules.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, it is of great significance to understand the corrosion behavior of candidate materials under supercritical water environments without additional oxidants, corresponding to the preheating stage of SCWO. With higher mechanical strength and better corrosion resistance compared to carbon steel or stainless steel at high temperatures [3][4][5][6][7][8], Nibased alloys are generally considered as the candidate materials for fabricating supercritical water reactors and other pipes & equipment working under supercritical condition. At present, many nickel-based alloys such as Alloy 625, Inconel 600, Alloy 690, Alloy 718 and Alloy C-276, have been investigated as candidate materials in pure supercritical water (SCW) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Sulfides on the Corrosion Behavior of Inconel 600 and Incoloy 825 in Supercritical Water

Wang

Tang

et al. 2015

Oxid Met

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Corrosion tests of Inconel 600 and Incoloy 825 were performed in supercritical water containing sulfides at 520°C and 25 MPa. The scales formed on Inconel 600 consisted of a thick outer layer of almost pure Ni 3 S 2 and an inner layer predominantly of Cr-rich spinels with a Ni 3 S 2 network inside. The scales of Incoloy 825 also had a multilayered structure. The outer layer primarily consisted of Ni 3 S 2 and (Ni,Fe) 3 S 4, followed by a thicker intermediate mixture layer of chromium-rich oxides, Ni 3 S 2, and (Ni,Fe) 3 S 4 , an inner layer of predominantly Cr 2 O 3 and a small amount of Ni 3 S 2 toward the substrate. Incoloy 825 showed slightly better corrosion resistance than Inconel 600 due to its higher Cr content. By means of superimposed isothermal phase diagrams and evaluation for the partial pressures of oxygen and sulfur in the designated atmosphere, the corresponding corrosion mechanisms were discussed, based on the present investigation.

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“…2c-2f. Cracking and spalling of the outer oxides scale results in the nitrogen penetration into the inner oxides scale, and inner nitridation to form TiN occurs, for Ti has a high affinity for nitrogen [25][26]. However, the nitrides particles disappear in lower depletion in the 452h oxidation samples.…”

Section: Oxides Thickness Profiles Analysismentioning

confidence: 96%