Effect of pH on corrosion behavior of 316L stainless steel in hydrogenated high temperature water

Wang, Jiazhen; Wang, Jianqiu; Ming, Hongliang; Zhang, Zhiming; Han, En‐Hou

doi:10.1002/maco.201709761

Cited by 16 publications

(12 citation statements)

References 63 publications

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“…The construction model of such EEC is consistent with the interface structure of the oxide film observed by STEM. [23] T A B L E 3 The position of characteristic peaks for the oxide films formed on the RASP-treated 316LN SS specimens As shown in Figure 8a, the low-frequency regions of these Nyquist diagrams are composed of irregular arcs corresponding to the inner layer of the oxide films. The inner layer plays a leading role in corrosion resistance.…”

Section: Eis Resultsmentioning

confidence: 99%

Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment

Chen

Dai

Qian

et al. 2021

Materials & Corrosion

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A newly developed technology, rotationally accelerated shot peening (RASP), was used to produce the nanocrystals on the surface of 316LN stainless steel.The effect of surface nanocrystallization on the oxide film properties of the steel in a high temperature and high-pressure aqueous environment was studied. It was found that the outer layer of the oxide film consisted of Ni-Fe 2 O 4 with a loose spinel structure. The inner layer distributed tiny Cr 2 O 3 particles compactly. The oxide films that grew on the RASP-treated 316LN showed thicker and denser with higher corrosion resistance than on the asreceived steel. The nanostructures produced by RASP enhanced the formation of the superior oxide film. However, the deformation defects caused by RASP were harmful to the corrosion resistance. The results in this paper provide an easy way to enhance the corrosion resistance of the steel served in a hightemperature aqueous environment.

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Section: Eis Resultsmentioning

confidence: 99%

Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment

Chen

Dai

Qian

et al. 2021

Materials & Corrosion

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“…Similar to usual electrochemical measurements, a cell with three electrodes is needed for HTHP measurements (Figure 5), where the working electrode is the electrode studied. The HTHP counter electrode is usually platinum, [59,73,77] although platinum-coated niobium, [64,71] alumina ceramic with platinum powder, [62] titaniumbased material [24,63,80] as well as autoclave body [81] were also reported as the auxiliary electrode. The HTHP reference electrode is, in general, a pressure-balanced silver/silver chloride electrode [17,24,59,[62][63][64]73,77,80,82] filled with potassium chloride.…”

Section: Hthp Electrochemical Measurements-experimental Protocolmentioning

confidence: 99%

“…The HTHP counter electrode is usually platinum, [59,73,77] although platinum-coated niobium, [64,71] alumina ceramic with platinum powder, [62] titaniumbased material [24,63,80] as well as autoclave body [81] were also reported as the auxiliary electrode. The HTHP reference electrode is, in general, a pressure-balanced silver/silver chloride electrode [17,24,59,[62][63][64]73,77,80,82] filled with potassium chloride. Marginally, zirconium/zirconium oxide [71] and nickel-chromium-molybdenum alloy [81] were also used as reference electrodes, since some issues with silver/silver chloride reference were reported under very high pressure (17 MPa) [81] and given that solution contamination might occur with pressurebalanced references during experiments lasting several days.…”

Section: Hthp Electrochemical Measurements-experimental Protocolmentioning

confidence: 99%

Monitoring and mitigating corrosion in geothermal systems

Schott

Liautaud

2022

Materials & Corrosion

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In terms of current needs for renewable resources, geothermal energy is one of the future solutions for heat and electricity generation. However, geothermal plants are exposed to very aggressive media (high-temperature [HT], salt-rich fluid, etc.), leading to extensive corrosion of the metallic parts. Should the corrosion inhibitors work at HT, their injection would be mandatory to ensure the reasonable lifetime of geothermal plants. The first part of this review concerns the degradations observed in geothermal plants, which depend on the site properties and the methods for evaluating the corrosion intensity of such systems. Autoclave experiments, although rarely used for geothermal applications, maybe the most appropriate to measure the representative corrosion rate, that is, under use temperature and pressure conditions. In the second part, clues to evaluate the performance and mechanism of corrosion inhibitors are mentioned, and molecules already used to protect steel are reported. However, this review also highlights the lack of data on HT inhibitors, especially for geothermal applications, where the efficiency of a given molecule is strongly related to the real medium. Thus, the protection of new geothermal plants where HT is reached requires the search for products that are stable and efficient under such conditions.Using the heat derived from the Earth's core, geothermal energy constitutes a renewable solution for future energy. It is already widely used worldwide, especially in Europe with several sites in Iceland and in the Dogger aquifer, Paris basin. Additional sites were recently identified, for example, in Upper Rhine Graben, where the composition of the media and use temperatures may differ from the already established plants.However, due to the aggressiveness of geothermal fluids, one major issue is the reduced lifetime of geothermal plants. Indeed, the steel tubes of such | © 2022 Wiley-VCH GmbH.

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“…The previous report has indicated that environmental pH has significant effect on the corrosion of materials not only in the abiotic environment [11][12][13][14][15], but also in the microbial environment [16][17][18]. However, the recent literature has focused mostly on MIC behaviour of duplex stainless steel at a neutral pH [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of pH regulation by sulfate-reducing bacteria on corrosion behaviour of duplex stainless steel 2205 in acidic artificial seawater

et al. 2021

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Sulfate-reducing bacteria (SRB) can regulate environmental pH because of their metabolism. Because local acidification results in pitting corrosion, the potential capacity of pH regulation by SRB would have important consequences for electrochemical aspects of the bio-corrosion process. This study focused on identifying the effect of pH on the corrosion of duplex stainless steel 2205 in a nutrient-rich artificial seawater medium containing SRB species, Desulfovibrio vulgaris . Duplex stainless steel samples were exposed to the medium for 13 days at 37°C at pH ranging from 4.0 to 7.4. The open-circuit potential value, sulfide level, pH and number of bacteria in the medium were recorded daily. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization were used to study the properties of the biofilms at the end of the experiments and the corrosion behaviour of the material. Inductively coupled plasma mass spectrometry was used to measure the concentration of cations Fe, Ni, Mo, Mn, Cr in the experimental solution after 13 days. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDX) were used for surface analysis. The results showed the pH changed from acidic values set at the beginning of the experiment to approximately pH 7.5 after 5 days owing to bacterial metabolism. After 13 days, the highest iron concentration was in the solution that was initially at pH 4 accompanied by pitting on the stainless steel. Sulfur was present on all specimens but with more sulfur at pH 4 in the EDX spectra. EIS showed the film resistance of the specimen at pH 4 was much lower than at pH 7.4 which suggests the corrosion resistance of the stainless steel was better at higher pH. The results of this study suggest that the corrosion process for the first few days exposure at low pH was driven by pH in solution rather than by bacteria. The increasing pH during the course of the experiment slowed down the corrosion process of materials originally at low pH. The nature and mechanism of SRB attack on duplex stainless steel at different acidic environments are discussed.

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Effect of pH on corrosion behavior of 316L stainless steel in hydrogenated high temperature water

Cited by 16 publications

References 63 publications

Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment

Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment

Monitoring and mitigating corrosion in geothermal systems

Effect of pH regulation by sulfate-reducing bacteria on corrosion behaviour of duplex stainless steel 2205 in acidic artificial seawater

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