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The results show that stress corrosion occurs easily in the experimental system, and corrosion forms develops gradually from localized corrosion including stress corrosion and pitting corrosion to general corrosion.
Results showed that P91 and X20CrMoV11-1 do not offer a sufficient long term corrosion resistance in molten nitrate salts.
It is shown that controlled potential and conventional chemical corrosion tests do not yield similar rates or types of attack under identical environmental conditions.
The paper shows how the structure and morphology of the film can be manipulated by altering the level of corrosion products in the water, and demonstrates that the precipitated outer layer of iron-rich oxide crystals affords no protection against corrosion.
After the surface treatment, localized corrosion becomes the dominant corrosion mechanism instead of general corrosion.
In chloride-induced corrosion process, corrosion cracking affects significantly the corrosion pattern.
Hence, a balance between polish scratch reduction and Cu corrosion associated with P3 pad pre-clean needs to be achieved.
How to obtain the status of the corrosion easily is very important for the safety of the operation.
Our results show that the oxidized samples do not possess improved corrosion resistance and may even fare worse than the untreated samples.
Those methods provide qualitative indications of the corrosion behavior, but alternative methods that do not disturb the surface properties are required to reliably quantify the corrosion rates of multiphase waste forms for long-term disposal assessments.
I argue that the U. S. Mint should stop producing pennies.
Our results show that the amount of solid corrosion by-products and concentration of hydrogen ions affect the rate of DO consumption during stagnation.
The results show that in most cases these causality factors do change when the system goes from uniform corrosion to crevice corrosion.
These results indicated that the change of DO was closely related to the corrosion process.

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Why is organic inhibitor important?
5 answers
Organic inhibitors are crucial in corrosion protection due to their ability to form protective films on metal surfaces. These inhibitors are preferred for their environmental friendliness and effectiveness across various temperatures. The efficiency of organic inhibitors depends on factors like molecular size, functional groups, and bonding atoms. Studies have shown that organic inhibitors can provide significant corrosion protection for metals like copper and aluminum. The interactions between organic molecules and metal surfaces play a vital role in reducing corrosion rates and enhancing inhibition effectiveness. Small organic molecules have unique electron-donating capacities that contribute to their corrosion inhibitive properties. Overall, organic inhibitors offer a cost-effective and efficient method to prevent corrosion and extend the lifespan of metal structures.
What is the role of d-cysteine in plants?
4 answers
D-cysteine plays a significant role in plant physiology by inducing root abscission and potentially serving as a substrate for hydrogen sulfide (H2S) generation, a crucial signaling molecule in plants. Studies suggest that D-cysteine triggers rapid root abscission in response to various environmental stimuli in water ferns like Azolla, highlighting its importance in stress responses. Additionally, D-cysteine is implicated in the generation of H2S through D-cysteine desulfhydrase (DCD) activity, contributing to various physiological functions in plants, such as growth regulation, defense responses, and stress tolerance. This dual role of D-cysteine underscores its significance as a key player in plant signaling pathways and stress adaptation mechanisms.
How does the incorporation of recycled aluminum affect the corrosion resistance of composite materials?
5 answers
The incorporation of recycled aluminum in composite materials can significantly impact their corrosion resistance. Studies have shown that introducing sustainable materials like fly ash and eggshells as reinforcements in aluminum matrix composites (AMCs) can enhance corrosion resistance. On the other hand, composite peening with ceramic particles like Al2O3 in aluminum can accelerate corrosion, particularly intergranular corrosion, compared to monolithic aluminum. Additionally, surface composites fabricated using friction stir processing with Mo particles reinforcement exhibit improved corrosion resistance, especially with higher Mo content and homogeneous distribution. Furthermore, aluminum matrix composites with SiC reinforcements prepared by powder metallurgy show varying corrosion rates based on the weight percentage of SiC, influencing the nucleation and growth of pits.
What are the applications of Mg alloys in implants?
4 answers
Magnesium (Mg) alloys are promising materials for biodegradable temporary implants due to their biodegradability, biocompatibility, and mechanical properties. However, their rapid corrosion rates in physiological environments hinder their widespread use. To address this, various coating methodologies have been explored, such as hydroxyapatite (HA) coatings and hybrid coatings with synthetic and natural polymers. These coatings enhance corrosion resistance, biocompatibility, and mechanical integrity of Mg alloys, making them suitable for biomedical applications. Surface modifications like plasma electrolytic oxidation (PEO) have also been successful in reducing corrosion rates and improving biological properties of Mg implants, promoting cell proliferation and extracellular matrix formation. Overall, the applications of Mg alloys in implants benefit from these coating and modification strategies to overcome corrosion challenges and enhance functionality.
Can ferrocyanide species detection in blood be used as a diagnostic tool for certain diseases or conditions?
4 answers
Ferrocyanide species detection in blood can serve as a diagnostic tool for various diseases or conditions. The combination of iron-cyanide chemistry with nanotechnology allows for ultrahigh sensitivity in whole blood analysis without pre-treatments. Additionally, the Anion‐Exchange Liquid Chromatography method validated on blood and other organs can accurately quantify cyanide levels, crucial in cases of poisoning. Furthermore, electrochemical methods like square wave voltammetry and differential pulse voltammetry, coupled with machine learning models, enable the quantification of ferrous ions in blood, showcasing high accuracy and sensitivity within seconds. These approaches highlight the potential of ferrocyanide species detection in blood as a valuable diagnostic tool for diseases related to iron levels, poisoning cases, and other health conditions.
How has Principal Component Analysis (PCA) been used to detect battery degradation in various types of batteries?
5 answers
Principal Component Analysis (PCA) has been utilized in various studies to detect battery degradation in different types of batteries. In one study, a PCA model was trained using voltage correlation data from lithium-ion battery packs to monitor cell conditions and detect faults accurately. Another research focused on enhancing State-of-Health (SOH) prediction for battery energy storage systems by employing PCA for feature extraction, considering multiple degradation features to improve prediction performance. Additionally, PCA was integrated into a data-driven method using Variational autoencoder (VAE) to quantify battery degradation patterns rapidly, converting sequence signals to image signals for efficient analysis and management of lithium batteries. These studies highlight the versatility and effectiveness of PCA in diagnosing and predicting battery degradation across different battery technologies.
What is the defintiion of hot corrosion?
4 answers
Hot corrosion is a form of chemical damage that occurs in materials exposed to hot gases above 400 °C without a liquid water phase, leading to surface degradation and reduced component life. It involves the deposition of corrosive species like sulfates onto hot components, causing destruction of the protective oxide scale. Hot corrosion mechanisms include thinning, erosion-corrosion, embrittlement, and localized attacks at grain boundaries. The removal of sulfur from fuel has been thought to mitigate hot corrosion, but the process is more complex, involving multiple sulfates and silicates from various sources like seawater entrained in the air. Hot corrosion significantly affects welded joints in high-temperature environments, such as gas turbines and boilers, leading to decreased service temperatures and potential failure. Coatings like Cr3C2-NiCr have been shown to protect against hot corrosion by forming protective oxide scales.
How the mechanisms the synthesis of Alumina Formation Stage in the air plasma environment ?
6 answers
The synthesis of alumina in an air plasma environment involves several mechanisms, each contributing to the formation and properties of the final alumina particles. Initially, the plasma synthesis of aluminum oxide particles utilizes a high-voltage alternating current plasma torch, where air plasma generated between annular copper electrodes interacts with an aqueous solution of aluminum nitrate, leading to the decomposition of nitrate to form oxide. This process is complemented by the effects observed when double laser pulses act on an aluminum alloy target, significantly increasing the concentration of Al ions and their interaction products with atmospheric oxygen, thus contributing to the alumina formation. Further, the synthesis process can involve the thermal dissociation of sillimanite in a thermal plasma medium, although direct conversion to alumina may require additional steps due to the formation of intermediate phases like mullite. A two-stage plasma-chemical synthesis process has been proposed to efficiently produce aluminum nitride powders, which, while focusing on nitride formation, highlights the potential for controlled phase synthesis in plasma environments. The plasma-chemical synthesis approach also demonstrates the importance of gas selection and process parameters in influencing the synthesis outcome. Moreover, the luminescence of aluminum oxide nanoparticles in a plasma of an overstressed nanosecond discharge indicates the formation of specific centers associated with alumina. The synthesis of magnesium-aluminum ceramics in thermal plasma further illustrates the versatility of plasma environments in facilitating the formation of complex oxides. The atmospheric plasma spraying technique used for synthesizing aluminum nanoparticles, which subsequently oxidize to form alumina, showcases another facet of plasma-assisted synthesis. The magnetically-filtered cathodic arc plasma deposition technique emphasizes the role of ion energy in controlling film structure and morphology during alumina film formation. Lastly, the atmospheric plasma spraying of mechanically alloyed powders onto aluminum substrates to form in-situ alumina composite coatings underlines the influence of process parameters on alumina formation. Together, these mechanisms underscore the complexity and versatility of alumina synthesis in air plasma environments, highlighting the importance of process parameters, plasma conditions, and material interactions in determining the characteristics of the final alumina product.
What are the different packaging concepts for steel coils?
5 answers
Various innovative packaging concepts for steel coils have been proposed in recent research. These concepts include systems with automated packaging processes, such as attaching different packaging materials to the inner and outer edges of the coil, wrapping the coil surfaces, and rotating the coil during packaging to enhance efficiency and reduce production costs. Additionally, there are systems designed to reduce physical strain on operators by incorporating lifting devices and rotating carrier roller assemblies for easier handling and improved working efficiency. Furthermore, there are auxiliary devices for dividing and packaging multiple steel plate coils simultaneously, preventing unwinding and facilitating the packaging bending operation for divided coils. Moreover, there are novel steel coil packaging materials made from a combination of various components to enhance strength, anti-tensile effects, and corrosion resistance.
What is aluminum combustion mechanisms on Melt-dispersion can occurs ?
4 answers
Aluminum combustion, particularly through the melt-dispersion mechanism (MDM), is a complex process influenced by various factors, including particle size, temperature, and the presence of an oxide shell. The MDM is characterized by the rapid melting of aluminum (Al) under conditions that induce high pressures within the particle, leading to the spallation of the oxide shell and dispersion of liquid Al clusters. These clusters, free from the diffusion limitations typical of larger particles or slower heating conditions, react rapidly with the surrounding environment. For nano-sized Al particles, the combustion process benefits from the unique properties of nanoparticles, such as low ignition temperature and fast energy release, despite the challenges of agglomeration. The combustion characteristics of these agglomerates maintain the advantages of single nanoparticles, including a low ignition temperature and a rapid energy release rate, facilitated by heat accumulation effects. Theoretical and experimental studies have confirmed the MDM for both nano and micron-sized Al particles, suggesting that controlling certain parameters during particle synthesis could enable micron-scale particles to achieve the reactivity of nanoscale counterparts. Critical experiments with Al and MoO3 thermites have further supported the MDM over the diffusion oxidation mechanism, indicating that flame propagation velocities and oxidation rates are significantly influenced by the Al nanoparticle's physical properties. Additionally, absorption spectroscopy studies have provided insights into the gas-phase species present during combustion, offering evidence contrary to some predictions of the MDM but still highlighting the mechanism's relevance. Moreover, numerical studies exploring ignition and combustion mechanisms in reactive systems have shown how the size and distribution of Al particles can affect ignition times and flame structures, emphasizing the role of particle characteristics in determining combustion behavior. Innovations in combustion systems and aluminum melting furnaces also reflect the importance of efficient and controlled combustion processes for industrial applications. In summary, the melt-dispersion mechanism in aluminum combustion is a multifaceted process influenced by nanoparticle properties, synthesis parameters, and combustion conditions, with significant implications for improving the efficiency and reactivity of aluminum-based energetic materials.
What are the potential applications of osmium metal oxides in catalysis and energy conversion processes?
5 answers
Osmium metal oxides show promise in catalysis and energy conversion processes. Osmium nanoparticles, although less studied compared to other precious metals, exhibit unique features that make them suitable for various applications. Osmium can serve as a highly active electrocatalyst for the hydrogen evolution reaction (HER) when deposited on defect-rich TiO2 nanostructures, offering a cost-effective alternative to platinum group metals (PGMs). Additionally, Os-containing metal oxide catalysts with unique coordination structures are being developed for the formation of C2 hydrocarbons through the oxidative coupling of methane, showcasing their potential in catalytic processes. Furthermore, OsII polypyridyl photosensitizers, with tunable properties, can absorb low-energy light for catalysis across barriers, indicating their relevance in energy conversion processes.