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The Evaluation Of Corrosion Behavior Of Austenitic Stainless Steels And Ni-Based Alloys In Molten Salts Under Isothermal And Thermal Cycling For Condition Concentrated Solar Power Plants

Picture for The Evaluation Of Corrosion Behavior Of Austenitic Stainless Steels And Ni-Based Alloys In Molten Salts Under Isothermal And Thermal Cycling For Condition Concentrated Solar Power Plants
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The drive towards renewable energy, requirement for reduction in fossil fuel consumption and emission of carbon dioxide has received substantial attention from governments and researchers worldwide during the last few decades [1]. The exploration of renewable sources of energy has been grouped into wind, geothermal, tidal and solar energy. Solar energy has shown great promise due to the abundant amount of energy reaching the Earth [2, 3]. Electricity generation from solar irradiation can be achieved by photovoltaic (PV) and photothermal conversion [4].

Product Number: 51322-17529-SG
Author: Qingyang Liu, Richard Barker, Chun Wang, Jiong Qian, Anne Neville, Frederick Pessu
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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The corrosion degradation of metallic components in Concentrated Solar Power Plants (CSP) with molten salt poses significant threat to the continuous safe operation at high temperature. Updated understanding of the corrosion behavior, mechanisms and the properties of corrosion products formed are needed to explain and optimize the corrosion performance of metals. In this study, the corrosion behavior of 321 SS, 347 SS, Alloy 625 and Alloy 825, are investigated in nitrate salt for 7, 14 and 28 days under isothermal; at 565°C, and thermal cycling conditions (between 565 and 290°C) in air. Several corrosion and advance surface evaluation techniques were implemented to characterize the corrosion process. The results show that the corrosion rate after thermal cycles is lower than in isothermal condition. This was due to increased spallation of corrosion products under isothermal test condition than during thermal cycling tests; particularly in stainless steel samples after 28 days. Multilayer corrosion products were observed on the surface of stainless steels and Ni-based alloys from both isothermal and thermal cycling tests. For stainless steels, an outer layer of sodium iron oxide, intermediate iron oxide and an inner layer of iron chromium spinel were found. NiO and Cr-rich oxides that were detected on the surface of Ni-based alloy, serve as protective layers against further corrosion processes.

The corrosion degradation of metallic components in Concentrated Solar Power Plants (CSP) with molten salt poses significant threat to the continuous safe operation at high temperature. Updated understanding of the corrosion behavior, mechanisms and the properties of corrosion products formed are needed to explain and optimize the corrosion performance of metals. In this study, the corrosion behavior of 321 SS, 347 SS, Alloy 625 and Alloy 825, are investigated in nitrate salt for 7, 14 and 28 days under isothermal; at 565°C, and thermal cycling conditions (between 565 and 290°C) in air. Several corrosion and advance surface evaluation techniques were implemented to characterize the corrosion process. The results show that the corrosion rate after thermal cycles is lower than in isothermal condition. This was due to increased spallation of corrosion products under isothermal test condition than during thermal cycling tests; particularly in stainless steel samples after 28 days. Multilayer corrosion products were observed on the surface of stainless steels and Ni-based alloys from both isothermal and thermal cycling tests. For stainless steels, an outer layer of sodium iron oxide, intermediate iron oxide and an inner layer of iron chromium spinel were found. NiO and Cr-rich oxides that were detected on the surface of Ni-based alloy, serve as protective layers against further corrosion processes.

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The Influence Of Applied Extension Rate And Specimen Geometry On Assessment Of SSC Resistance By Novel NTSSRT Method

Product Number: 51322-17624-SG
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High strength low alloy (HSLA) steels are preferred for oil and gas pipelines due to their outstanding mechanical properties. Sulfide stress cracking (SSC) has been a major problem for the application of HSLA carbon steel because of the wet H2S environment which commonly presents in oil and gas industry. Several techniques are applied to the study of SSC of steels, including constant load test with smooth specimens and DCB testing.
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Product Number: 51322-17801-SG
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Maintaining the integrity of oilfield equipment is essential to its safe operation and to maximize the efficiency of production. The integrity of oilfield equipment can rely on material selection and control of conditions, however, it is commonly maintained by the applications of chemical corrosion inhibitors (CI). Prior to use, these chemicals must be shown to perform as desired under the field conditions in question. To achieve this, chemicals are often evaluated using robust laboratory-based screening studies to identify potential candidates.
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The Effects Of Different Blast Abrasives On The Performance Of Liquid-Applied Epoxy Pipeline Coatings

Product Number: 51322-17806-SG
Author: Haralampos Tsaprailis, Shan (Sherry) Rao
Publication Date: 2022
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Proper surface preparation to create sufficient adhesion of a coating over the substrate is fundamentally important in the long-life performance of a protective coating. Abrasive blast cleaning provides a fast and well-established method of surface preparation, which utilizes energy generated by an air supply to deliver a mass of abrasive particles at certain speeds and volumes to impact the steel resulting in a cleaned surface. The method not only cleans the surface to remove rust, scale, paint, and similar contaminations, but also roughens the surface to produce mechanical and chemical adhesion for a coating. Therefore, abrasive blasting is the preferred method for preparing steel for the application of high-performance coatings and routinely used for achieving the required surface conditions prior to a coating work.
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