Corrosion Behaviors of SS310 and IN718 Alloys in Molten Carbonate

2021 ◽  
Author(s):  
Yu Zhang ◽  
Peilin Wang ◽  
Kaiyuan Zheng ◽  
Huayi Yin ◽  
Dihua Wang
Keyword(s):  
High Temperature ◽  
Corrosion Rate ◽  
Molten Salt ◽  
Oxygen Concentration ◽  
Metallic Materials ◽  
Molten Carbonate ◽  
Suitable Material ◽  
Gas Atmosphere ◽  
Corrosion Behaviors ◽  
Lower Corrosion Rate

Abstract Long-lasting metallic materials are key to enabling a robust and reliable molten carbonate electrolyzer. In this paper, the corrosion behaviors of SS310 and IN718 in molten Li2CO3-K2CO3-Na2CO3 under CO2-O2 atmosphere were systematically studied. The results show that IN718 had a lower corrosion rate than that of SS310 because of the higher Ni concentration. In addition, increasing the temperature and decreasing the oxygen concentration can reduce the corrosion rate of both SS310 and IN718. As a result, IN718 is a suitable material to be used in molten salt electrolyzers. Overall, engineering the alloy and molten salt compositions as well as manipulating the gas atmosphere can suppress the corrosion of metallic materials, thereby screening durable metallic materials for high-temperature molten carbonate electrolyzers.

Corrosion Resistance of Surface treated Alloy 617 in High Temperature HI and H2SO4 Environments

2013 ◽  
Vol 1519 ◽  
Author(s):  
Donghoon Kim ◽  
Injin Sah ◽  
Jin Young Choi ◽  
Young Soo Kim ◽  
Hee Cheon No ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Metallic Materials ◽  
Type Specimens ◽  
Alloy 617 ◽  
Coated Alloy ◽  
Corrosion Behaviors ◽  
Oxide Spallation ◽  
Chemical Cycle ◽  
Corrosive Environments

ABSTRACTThe sulfur-iodine thermo-chemical cycle (S-I cycle) is one of the promising nuclear hydrogen production methods combined with a high temperature gas-cooled reactor. However, extremely corrosive environments limit the selection of structural materials. Therefore, in this study, corrosion behaviors of several metallic materials were investigated to screen the candidate metallic materials. Coupon type specimens were exposed for 100 h in simulated SO3 and HI decomposer conditions at 850 °C. After 100 h exposure, the surface treated Alloy 617 showed the superior weight change in both environments. However, scanning electron microscope observation showed oxide spallation for EB-treated and NiAl coated Alloy 617. On the other hand, the Ni3Al coated Alloy 617 showed better corrosion resistance in SO3 decomposer condition, such that only formed external Al-rich oxide layer. Especially, in a HI decomposer condition, the damage on the Ni3Al coated Alloy 617 was considerably less significant probably due to the protection by very thin aluminum-rich oxide on the surface.

Corrosion Behavior of Thixoformed AZ91D Magnesium Alloy in NaCl Aqueous Solution

2007 ◽  
Vol 353-358 ◽  
pp. 2611-2614
Author(s):  
Wei Jun Xu ◽  
Ying Ma ◽  
Ti Jun Chen ◽  
Yuan Hao
Keyword(s):  
Corrosion Rate ◽  
Surface Film ◽  
Protective Role ◽  
Spherical Particles ◽  
Protective Film ◽  
Az91d Alloy ◽  
Β Phase ◽  
Corrosion Behaviors ◽  
Lower Corrosion Rate ◽  
Better Than

The corrosion behaviors of thixoformed AZ91D alloy immersed in 3.5% NaCl aqueous were studied by using the weight lose method and observed by scanning electron microscopy and analyzed by electron probe micro-analysis.The results showed that corrosion rate of thixoformed AZ91D alloy was higher in initial stages and decreased as the immersion time increased. Compared with the thixoformed alloy, the change of corrosion rate of permanent mould cast (PMC) alloy was smoothly. The observation on the corrosion surfaces showed that the primary αphase spherical particles were first suffered from corrosion during corrosion testing, and then the eutecticαgrains. the composition of primaryαphase particles in the thixoformed alloy was quite uniform, and thus the protective film of the corrosion products on the alloy surface was more intact. The amount of the eutectic β phase in the inter-particle eutectics was relatively higher and the distribution was more uniform, so the protective film consisted by eutectic β phase was also more intact. That is to say the protective role from the surface film on the thixoformed alloy was better than that on the PMC alloy which was the cause of lower corrosion rate of the thixoformed AZ91D alloy.

Accelerated Corrosion of Stainless Steels in the Presence of Molten Carbonate below 923 K

1997 ◽  
Vol 496 ◽  
Author(s):  
Ken-ichiro Ota ◽  
Katsuya Toda ◽  
Naobumi Motohira ◽  
Nobuyuki Kamiya
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Corrosion Rate ◽  
Stainless Steels ◽  
Corrosion Test ◽  
Initial Period ◽  
High Temperature Corrosion ◽  
Molten Carbonate ◽  
Reaction Conditions ◽  
Accelerated Corrosion

ABSTRACTThe high temperature corrosion of stainless steels (SUS316L and SUS310S) in the presence of molten carbonate [(Li0.62K0.8)2CO3 and (Li0.52Na0.48)2CO3] has been studied in a CO2-O2 atmosphere by measuring the weight gain of the specimens.The corrosion of SUS316L significantly depended on the reaction conditions. With the carbonate coating (both Li/Na and Li/K carbonates), severe corrosion occurred during the initial period of the corrosion test below 923 K, especially around 823 K. The initial severe corrosion was a local corrosion which produced through holes in the metal specimens and occurred more clearly at low Pco2 with the Li/Na coating than with the Li/K coating. The corrosion became more severe at higher CO2 pressures and lower O2 pressures. In a pure CO2 atmosphere (without O2), the corrosion rate significantly increased at 823 K. The steel was corroded uniformly at that time.

scholarly journals High-Temperature Corrosion Behavior of Al-Coated Ni-Base Alloys in Lithium Molten Salt for Electroreduction

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 328
Author(s):  
Wan-Bae Kim ◽  
Woo-Seok Choi ◽  
Kyu-Seok Lim ◽  
Soo-Haeng Cho ◽  
Jong-Hyeon Lee
Keyword(s):  
Weight Loss ◽  
High Temperature ◽  
Molten Salt ◽  
Basic Oxide ◽  
Oxidizing Atmosphere ◽  
Basic Flux ◽  
O2 Concentration ◽  
Corrosion Behaviors ◽  
Lithium Molten Salt ◽  
Oxide Ion

The electrolytic reduction of a spent oxide fuel involves the liberation of oxygen in a molten salt LiCl–Li2O electrolyte, which creates a corrosive environment for typical structural materials. In this study, the corrosion behaviors of Al–Y-coated specimens in a Li molten salt kept under an oxidizing atmosphere at 650 °C for 72 and 168 h were investigated. The weight loss fraction of the coated specimen to bare specimen was approximately 60% for 3% Li2O and 54% for 8% Li2O at 72 h, and approximately 38% for 3% Li2O and 30% for 8% Li2O at 168 h. Corrosion was induced in the LiCl–Li2O molten salt by the basic oxide ion O2− via the basic flux mechanism, and the corrosion product was found to be dependent on the activity of the O2− ion. The increase in weight loss may have been caused by the increase in the O2− concentration due to the increase in the Li2O concentration rather than being because of the increased reaction time. The Al–Y coating was found to be beneficial for hot corrosion resistance, which can be useful for handling high-temperature lithium molten salt under an oxidizing atmosphere.

Corrosion Rate and Oxide Scale Characteristics of Austenitic Alloys in Supercritical Water

2006 ◽  
Vol 522-523 ◽  
pp. 213-220 ◽  
Author(s):  
Yutaka Watanabe ◽  
Yuzo Daigo
Keyword(s):  
Corrosion Rate ◽  
Oxygen Concentration ◽  
Supercritical Water ◽  
Stainless Steels ◽  
Corrosion Property ◽  
High Oxygen ◽  
Corrosion Properties ◽  
Oxygen Conditions ◽  
Oxygen Condition ◽  
Lower Corrosion Rate

Corrosion properties were investigated on stainless steels and Ni base alloys in supercritical water containing 0.01mol/kg-H2SO4 at 400°C/30MPa as a function of oxygen concentration ranging from 3ppb to 800ppm. Alloys with high Fe content showed an interesting contrast in corrosion property in sulfuric acid-containing supercritical water between at the high oxygen condition (800ppm) and at the lower oxygen conditions (3ppb and 8ppm). At 8ppm of oxygen concentration or lower, corrosion rate was a unique function of Cr content of the alloys including both Ni base alloys and stainless steels. However, corrosion resistance of the iron-based alloys (316 stainless steels) was remarkably improved when oxygen concentration was increased up to 800ppm. Corrosion rate of alloy C-276, which contains 5.7% of iron, was also somewhat reduced under the high oxygen condition, while corrosion rate of the other “iron-less” Ni base alloys was accelerated as oxygen level was increased. Characteristics of oxide scales, in terms of chemical composition and compound structure, have been examined in connection with the corrosion properties of the alloys.

Corrosion Behaviors of Al-Steel-Sputtering-Treated Steel and SiC/SiC Composites in High Temperature LBE at Low Oxygen Concentration

2006 ◽  
Author(s):  
Abu Khalid Rivai ◽  
Minoru Takahashi
Keyword(s):  
High Temperature ◽  
Oxygen Concentration ◽  
Low Oxygen ◽  
Base Area ◽  
Treated Steel ◽  
Corrosion Behaviors ◽  
Sic Composites ◽  
Low Oxygen Concentration ◽  
Ss 304 ◽  
Treated Layer

Corrosion tests of Al and SS-304-sputtering-surface treated STBA26 (9Cr.1Mo.0.1Si) and SiC/SiC composites with BN (boron nitide) coating has been conducted in high temperature LBE of 700°C at low oxygen concentration of 6.8 × 10−7 wt% and the behavior was analyzed. The sputtering technique was used to protect the steel from corrosion. The thickness of sputtering-treated layer was 21.45 μm. All specimens were immersed in LBE in a pot for 1000 hours. The STBA26 (9Cr.1Mo.0.1Si) without surface treated were also tested for comparison with sputtering-treated steels. The results showed that sputtering-treated layer still remained on the base of STBA26. No penetration of LBE was observed in this layer. The layer could protect the steel from penetration of LBE. The result also showed that thin layer which contains aluminum oxide and chromium oxide was formed on the surface-treated layer, and it protected the base area. On the contrary, the penetration in base area was observed in the as received STBA26. In SiC/SiC composites, there appeared cracks in a thin surface area and LBE penetrated deeply into the material. The corrosion did not occur in this SiC/SiC composite in the high temperature LBE.

Sign in / Sign up

Export Citation Format

Share Document