Article
Energy & Fuels
Ming Zhu, Han Yi, Jintao Lu, Chunlin Huang, Huihui Zhang, Pang Bo, Jinyang Huang
Summary: This paper studied the purification schemes of ternary chloride molten salt to prevent high-temperature corrosion of structural materials. The addition of Al powder was found to reduce the corrosion current density and form protective Al2O3 and Ni3Al layers, prolonging the lifetime of the material in the chloride molten salt.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Multidisciplinary Sciences
Farshad Bahremand, Taghi Shahrabi, Bahram Ramezanzadeh, Seyed Ali Hosseini
Summary: One application of organic compounds is to utilize them as corrosion inhibitors in acidic environments to diminish steel corrosion. These inhibitors do not show very good inhibition properties in saline (NaCl) environments. There have been many studies on boosting these inhibitors' performance in such environments (especially Cl- containing media). One of the ways that have been proposed is the use of organic and inorganic inhibitors, simultaneously. The synergistic effect of these inhibitors has shown promising results in reducing steel corrosion.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Coatings & Films
Shuai Zhang, Cheng Wang, Sixu Zhao, Anqi Niu, Yinlong Ma, Baochang Liu
Summary: The novel cerium-based conversion (CeC) treatment was performed on 2A14-T3511 aluminum alloy micro-arc oxidation (MAO) coatings with thicknesses of 15 μm and 30 μm. The sealing effect and chemical composition of the sealant were characterized, and the influence of coating structure on the deposition of cerium compounds was discussed. Long-term corrosion behavior was investigated using electrochemical methods. The results showed that CeC treatment significantly improved the long-term corrosion protection of MAO coatings, attributed to the physical sealing and chemical corrosion inhibition of the Ce-based deposits.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xueping Chen, Jianhua Tang, Han Wei, Hanlu Zhang, Yuming Tang, Xuhui Zhao, Yu Zuo
Summary: The inhibitory effect and mechanism of cerium tartrate as a pigment in epoxy coating on AA2024-T3 aluminum alloy in a NaCl solution were studied. The addition of cerium tartrate significantly improved the protective performance of the epoxy coating, possibly due to the modification effect by cerium salts and the synergistic inhibitory effect by tartrate group and cerium ions. The double-layer coating showed similar protective properties to the single-layer coating, indicating that creating a protective film on the aluminum alloy substrate can contribute to improving the protection performance of the coating.
Article
Chemistry, Physical
Shuhong Cao, Run Cheng, Hongxia Liu, Wenyan Shi, Qingyun Yuan, Jingwen Chen
Summary: In this study, three isatin-thiosemicarbazone derivatives with different substituents at C5 of the indolin-2-one ring were synthesized and evaluated as corrosion inhibitors for AA6060 aluminum alloy. The inhibitory behavior and performance were investigated using various techniques, and the effects of substituents on inhibition were analyzed.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Materials Science, Multidisciplinary
R. del Olmo, M. Mohedano, P. Visser, A. Rodriguez, E. Matykina, R. Arrabal
Summary: Chromic acid anodizing (CAA) is still commonly used in the aeronautic industry for corrosion protection, but Ce-containing sulfuric acid anodizing (SAA) has been identified as a promising alternative. This study found that thin sulfuric acid anodizing (TSAA) films containing Ce formed at low current density can approach the performance of CAA.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Environmental
Shuaikang Yang, Ruixue Sun, Kezheng Chen
Summary: A novel method of preparing self-healing phytic acid/cerium composite coating on magnesium alloy via hydrothermal treatment was reported. The dense and homogeneous coating with a thickness of about 5 μm showed excellent corrosion resistance and self-healing behavior, providing long-term protection for the substrate.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Haiyang Wang, Yulai Song, Xuegang Chen, Guodong Tong, Linyang Zhang
Summary: The research demonstrates that the PEO-LDHs-SDS composite film exhibits excellent short-term and long-term protection performance, which can be attributed to the blocking effect of the super-hydrophobic surface, the sealing effect of LDHs on the micropores of the PEO film, and the readsorption and corrosion inhibition of SDS anions.
Article
Materials Science, Multidisciplinary
Yu-Jui Lin, Chao-Sung Lin
Summary: The corrosion behavior and corrosion rate of friction stir welded AZ31B magnesium alloy and 6N01 aluminum alloy dissimilar joints were studied using real-time imaging, potentiodynamic polarization, EIS, and hydrogen evolution tests. The corrosion rate was found to increase in the order of Al base metal < Mg base metal < stirred zone. The galvanic coupling of the Mg phase to other phases enhanced the corrosion of both base metals, and intense corrosion at BM-AZ31B elevated the interfacial pH due to water reduction on the cathodic particles of BM-6N01.
Article
Chemistry, Physical
Yixuan Cao, Changjun Zou, Chengjun Wang, Hao Liang, Wenjing Chen, Wenjing Li
Summary: The study demonstrated that the addition of TiO2 nanoparticles and sodium dodecyl benzene sulfonate (SDBS) can significantly inhibit the corrosion of 3003 aluminum alloy in aqueous ethylene glycol containing chloride ions, and protect the alloy from damage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Green & Sustainable Science & Technology
Luowen Peng, Delei Yang, Jichao Zhang, Youyang Xin, Yu Liu, Mingxing Ai
Summary: This study investigates the effects of different alloy plates on the properties of concrete and suggests anchoring measures when using aluminum alloy plates in high temperature areas.
Article
Materials Science, Multidisciplinary
Jordan Roger Kozakevich, Joshua Stroh, Dimitry Sediako, David Weiss
Summary: Heat-treated aluminum-silicon (Al-Si)-based alloys have been the dominant choice for cast lightweight alloys, but Al-Ce-based alloys are showing promise as a replacement due to their elimination of costly heat treatments. This study characterizes the solidification of an Al-Ce alloy with Ni and Mn additions, revealing the presence of different phases at different cooling rates. The findings suggest that Al-Ce-Ni-Mn alloys have potential in industrial applications.
Article
Chemistry, Multidisciplinary
Mingming Ma, Yijun Cao, Qi Wang, Wei Shang, Ning Peng, Yuqing Wen
Summary: Flexible barrier films preventing corrosion are important for various industries. This study investigates a BTESPT/rGO composite film to enhance the corrosion resistance of aluminum alloys. The results demonstrate that the composite film exhibits improved barrier properties against corrosive ions and significantly better corrosion resistance compared to a single BTESPT film. The salt spray experiment further confirms the effectiveness of the composite film in enhancing the corrosion resistance of aluminum alloy substrates.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Rajesh Yadav, Ankur Kumar, Gajanan P. Chaudhari, A. G. Paradkar
Summary: The 5059H116 alloy welded by friction stir welding (FSW) showed superior corrosion resistance, while the gas metal arc welding (GMAW) sample had a shorter time to failure due to factors such as chemical heterogeneities and the presence of micro-porosity.
Article
Materials Science, Multidisciplinary
Ankur Kumar, Gajanan P. Chaudhari, S. K. Nath
Summary: The stress corrosion cracking (SCC) behavior of high-zinc (>7 wt%) 7068 alloys treated with different retrogression and re-ageing processes was investigated. The resistance to SCC and inter-granular corrosion was found to be correlated with microstructural and compositional heterogeneities. Specimens that were pre-aged at 1000C and retrogression treated at 180 degrees C showed slower reduction reaction kinetics in polarization studies, indicating better SCC resistance. The oxygen reduction kinetics were also affected by the size of matrix precipitates, in addition to the microchemistry of grain boundary precipitates. An increase in copper content of discontinuous boundary precipitates did not consistently lead to improved SCC resistance. 7068 alloy specimens pre-aged at lower temperature exhibited higher strength and SCC resistance.
Article
Materials Science, Multidisciplinary
Srinivas Palli, V. S. Raja
Summary: The influence of different buffer chemistries on the electrochemical corrosion behaviors of mild steel and 7004 aluminum alloy were studied, showing variations in anodic and cathodic kinetics for different buffers. These variations were explained by the reduction of weak acids and complexing behavior of metal ions with buffer species, highlighting the importance of considering buffer chemistries in studying pH influence on electrochemical corrosion.
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Gayathri Sridhar, Nick Birbilis, V. S. Raja
Summary: This study investigated the error introduced in estimated pit sizes by treating each current transient as a signal arising from single discrete pit events, and proposed a criterion to identify the transients associated with recursive pit events that eventually developed into stable pits.
Article
Metallurgy & Metallurgical Engineering
Bidyut Dutta, M. Ajay Krishnan, V. S. Raja
Summary: The study reveals that the hydrogen embrittlement behavior of IN 718 alloy varies under different aging conditions, mainly due to the increase in hydrogen traps leading to an increase in susceptibility to hydrogen.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Materials Science, Multidisciplinary
Rahul Kumar Agrawal, V. S. Raja
Summary: The study indicates that exposure to 3.5 wt pct NaCl can either increase or decrease the work-hardening rate of AA 7004, while the ultimate tensile strength and elongation values remain relatively constant. However, the alloy may experience embrittlement, leading to the formation of tearing topography surfaces.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Mangesh D. Pustode, Purnendu Chakraborty, Bharat S. Padekar, Shweta Shukla, V. S. Raja
Summary: The HSSCC behavior of SLM Ti-6Al-4V alloy was studied at 300 and 400 degrees C in both as-built and heat-treated conditions. Annealing at 750 degrees C significantly improved the HSSCC resistance of the susceptible as-built alloy, with only a slight decrease in ultimate tensile strength. The transformation of martensite into lamellar alpha + beta was identified as the reason behind the improved HSSCC resistance, with the absence of equiaxed alpha in the wrought alloy potentially contributing to the enhanced performance.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Dwaipayan Mallick, Nicolas Mary, V. S. Raja, Bernard Normand
Summary: The banded microstructure and higher C content in DP steels resulted in higher H diffusivity, while the higher fraction of H present in stronger traps in CP steels suggests better hydrogen embrittlement resistance. The non-uniform distribution of H in the specimens with higher concentration near the charging surface was also observed.
Article
Chemistry, Applied
Sneha Daradmare, Mamata Pradhan, V. S. Raja, Smrutiranjan Parida
Summary: The study demonstrates that 8-HQ@PS/GO corrosion inhibitor in composite coatings exhibits self-healing properties and a two-way corrosion protection mechanism, increasing the hardness and elastic modulus of the coating while lowering surface electrical resistivity, making it suitable for antistatic applications.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Metallurgy & Metallurgical Engineering
Rajiv Kumar, R. K. Singh Raman, S. R. Bakshi, V. S. Raja, S. Parida
Summary: The oxidation behavior of nanocrystalline and microcrystalline Fe-20Cr-3Al alloys at high temperatures was investigated in this study. The nanocrystalline alloy exhibited superior oxidation resistance compared to the microcrystalline alloy, which can be attributed to the oxidation kinetics and nature of the oxide formed. The higher grain boundary area in the nanocrystalline alloy enhanced the metal diffusivity and resulted in a more protective oxide layer. Additionally, both alloys showed better oxidation resistance at 800 degrees C than at 700 degrees C, contrary to common steels.
OXIDATION OF METALS
(2022)
Article
Materials Science, Multidisciplinary
Rahul Kumar Agrawal, V. S. Raja
Summary: This study investigates the effects of environments on the atomic strain distribution in AA 7004 alloy. Two different temper conditions and three different test environments were chosen. The results show that the environment significantly affects the deformation behavior of the alloy, which can be explained by the alterations in strain distribution at the atomic level.
Article
Materials Science, Multidisciplinary
Shweta Shukla, Balila Nagamani Jaya, V. S. Raja
Summary: The study examined the role of microstructure on the cathodic reactions and plastic deformation behavior of AA 7050 to understand its environmentally assisted cracking tendency. The results showed that the alloy has high ability to resist environmentally assisted cracking as long as the grain boundary precipitates are rich in Cu.
Article
Chemistry, Physical
Rajiv Kumar, R. K. Singh Raman, S. R. Bakshi, V. S. Raja, S. Parida
Summary: The present study investigates the oxidation behavior of nanocrystalline (NC) and microcrystalline (MC) Fe-20Cr-5Al alloys at 900 degrees C. The results show that nanocrystallization reduces the Al requirement for the formation of a protective Al2O3 layer, leading to a significantly lower oxidation rate compared to microcrystalline alloy. Additionally, the microcrystalline alloy exhibits a higher weight gain than the nanocrystalline alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Srinivas Palli, Jagannath Majhi, V. S. Raja
Summary: This study aims to investigate the influence of oxide scales and chloride ions on the pickling behavior of hot-rolled steel coil. It was found that the thickness and nature of the oxide scale varied across the width of the steel coil. The addition of NaCl to 10% HCl significantly reduced pickling time and the corrosion rate of the bare steel. Chlorides enhanced the chemical dissolution of the oxide scale through complexation and inhibited corrosion of steel through the familiar Temkin adsorption mechanism.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Review
Multidisciplinary Sciences
Bhagwat Ghule, C. Sundaresan, Dandapani Vijayshankar, V. S. Raja
Summary: In the pursuit of a sustainable future, the use of higher steam temperatures and pressures in coal-fired boilers and nuclear reactors is becoming more common. This requires advanced materials with high steam oxidation resistance. Various factors affect steam oxidation, making it challenging to compare the performance of different alloys and understand the role of each operational parameter.
JOURNAL OF THE INDIAN INSTITUTE OF SCIENCE
(2022)
Article
Electrochemistry
V. S. Raja, Muzzamil Ahmad Eatoo, Rahul Kumar Agrawal, Srinivas Palli, M. Ajay Krishnan
Summary: This paper reports the beneficial effects of strontium (Sr) on sensitization kinetics and unusual passivation behavior in Al-5.7 wt% Mg alloy. The presence of strontium not only retards the sensitization kinetics but also enhances intergranular corrosion resistance. Surface enrichment of Cr and Sr as oxides and hydroxides increases the passivity and pitting potential of the alloy. The presence of both Cr and Sr helps retain the alloy's passivity even in the sensitized condition.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Metallurgy & Metallurgical Engineering
Rahul Kumar Agrawal, Namrata Upadhyay, V. S. Raja
Summary: The study investigates the effect of applied strain on the nature of corrosion attack on AA 7004 with different microstructures. It is found that the influence of strain on corrosion attack, whether it is localized or uniform, depends on the microstructure of the material. The presence of G.P. zones promotes a relatively uniform corrosion attack under strain, while the presence of eta'/eta precipitates leads to a more localized attack.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
