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論文

In situ X-ray diffraction study of the oxide formed on alloy 600 in borated and lithiated high-temperature water

渡邉真史*; 米澤利夫*; 菖蒲敬久; 城鮎美; 庄子哲雄*

Corrosion, 72(9), p.1155 - 1169, 2016/09

https://doi.org/10.5006/1994

被引用回数：1 パーセンタイル：6.28(Materials Science, Multidisciplinary)

In situ X-ray diffraction (XRD) measurements of the oxide film formed on Alloy 600 in borated and lithiated high-temperature water were conducted to demonstrate a capability to investigate rapid changes in oxide films during transient water chemistry conditions. In the presence of dissolved hydrogen (DH) = 30 cm $^{3}$ /kg [H $_{2}$ O] and dissolved oxygen (DO) 0.06 ppm, only spinel oxides were detected and no significant NiO peak was found even after 1,220 h exposure. By contrast, once the DO was increased to 8 ppm, a NiO peak grew rapidly. Within 7 h, the amount of NiO became comparable to that of spinel oxide. However, when DO was decreased again below 0.3 ppm and DH was increased up to 30 cm $^{3}$ /kg [H $_{2}$ O], the ratio of NiO to spinel did not change during 10 h. Thus, the rate of dissolution of NiO in DH = 30 cm $^{3}$ /kg water seemed to be lower than the growth rate of NiO in high DO conditions.

論文

In situ X-ray diffraction measurement method for investigating the oxides films on austenitic stainless steel in simulated pressurized water reactor primary water

渡邉真史*; 米澤利夫*; 菖蒲敬久; 庄子哲雄*

Corrosion, 71(10), p.1224 - 1236, 2015/10

https://doi.org/10.5006/1690

被引用回数：3 パーセンタイル：17.9(Materials Science, Multidisciplinary)

Synchrotron X-ray diffraction analytical techniques have been used to investigate the structure of oxide films formed on Type 316L (UNS S31603) austenitic stainless steel in simulated pressurized water reactor primary water. The observed layer structures of the oxide films changed depending on the dissolved hydrogen concentration (DH) in PWR primary water. In two cases, where DH = 5 cm $^{3}$ /kg (H $_{2}$ O) or 30 cm $^{3}$ /kg (H $_{2}$ O), a (Ni $_{x}$ Fe( $_{1-x}$ ))Fe $_{2}$ O $_{4}$ -type spinel oxide was observed as the outer oxide, and a FeCr $_{2}$ O $_{4}$ -type spinel oxide was detected as the thin inner oxide. When DH = 30 cm $^{3}$ /kg (H $_{2}$ O), the Fe:Ni ratio in the (Ni $_{x}$ Fe( $_{1-x}$ ))Fe $_{2}$ O $_{4}$ outer spinel oxide was much larger than when DH = 5 cm $^{3}$ /kg (H $_{2}$ O). In addition, sequential in situ measurements when the hydrogen concentration varied from 5 cm $^{3}$ /kg (H $_{2}$ O) to 30 cm $^{3}$ /kg (H $_{2}$ O) also demonstrated that the oxide layer structure seemed to adjust its characteristic composition as a function of the DH.