Article
Electrochemistry
Martin A. Rodriguez
Summary: An extensive database of crevice corrosion repassivation potentials (E-R,E-CREV) for corrosion-resistant and high-temperature alloys was analyzed using statistical tools. The study assessed the repeatability of results and evaluated various factors that may affect the testing techniques used to determine E-R,E-CREV, such as crevice formers material, applied torque, corrosion propagation, and environmental and metallurgical conditions. Guidelines for determining the significance of changes in repassivation potentials were proposed, and a sample size of 5 was found to be appropriate for assessing changes in environmental or metallurgical conditions.
Article
Engineering, Mechanical
Hongtao Tong, Xuehui Liu, Yongqiang Sui, Feng Liu, Yapeng Liu, Xiangbo Li, Jian Hou
Summary: This paper investigates the failure analysis of a heat exchanger made of 70/30 cupronickel. Visual examination, chemical composition analysis, and microstructure characterization were conducted to determine the root cause of the failure, which was identified as severe pitting corrosion.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Polymer Science
Elodie Guilminot
Summary: In this study, polysaccharide-based hydrogels such as agar, gellan and xanthan gum were used for metal treatments, providing advantages for targeted chemical or electrochemical treatment. The use of these hydrogels in the restoration of metal cultural heritage objects was explored, with agar gel achieving the best results for cleaning copper alloys. Electrochemical treatments using hydrogels were successful in cleaning silver and dechlorinating ferrous or copper alloys. However, hydrogels were less effective in cleaning archaeological lead. These findings highlight the potential of hydrogel treatments in metal restoration.
Article
Engineering, Multidisciplinary
Ida Hamidah, Agus Solehudin, Aam Hamdani, Lilik Hasanah, Khairurrijal Khairurrijal, Tedi Kurniawan, Rizalman Mamat, Rina Maryanti, Asep Bayu Dani Nandiyanto, Belkheir Hammouti
Summary: The increase in electrolyte concentration accelerates the corrosion process of copper alloys, but excessively high concentrations do not further affect the corrosion profile. Acidic and salt electrolytes have a greater impact on corrosion compared to alkaline solutions, as they can destroy the passivation layer. Corrosion rates are correlated with decreases in mechanical properties, leading to weakened atomic structure and increased fatigue during corrosion.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Emilande Apchain, Delphine Neff, Jean-Paul Gallien, Nicolas Nuns, Pascal Berger, Albert Noumowe, Philippe Dillmann
Summary: Protective treatments such as microcrystalline wax and decanoate solution are essential for safeguarding copper artefacts from atmospheric degradation. The efficiency and durability of these treatments depend on their penetration into corrosion layers, which is affected by application mode. Re-corrosion experiments showed that the long-term effectiveness and durability of the treatments are influenced by their penetration levels in the corrosion layers.
Article
Chemistry, Multidisciplinary
Changqing Miao, Xue Yin, Kang Yang, Chenhua Zhang, Yanhua Meng
Summary: In order to protect the structural patterns of coins, researchers explored simple preparation methods to achieve good hydrophobic capability and wear-damage resistance of the CuZnPb surfaces. By combining a self-cleaning nanoliquid with microstructured silver-dispersed CuZnPb, they were able to achieve good hydrophobicity. The cooperative functions of silver and the nanoliquid enhanced the water reunion ability and increased contact areas, resulting in high contact angles.
Article
Chemistry, Physical
Wei Li, Baimei Tan, Shihao Zhang, Lei Guo, Jinbo Ji, Mei Yan, Ru Wang
Summary: Triazoles and their derivatives exhibit great potential as copper corrosion inhibitors, showing chemical activities and limited toxicity. Their effectiveness in protecting copper in an alkaline environment has been investigated through experimental techniques and theoretical calculations.
APPLIED SURFACE SCIENCE
(2022)
Review
Biotechnology & Applied Microbiology
Umarevathi Gopalakrishnan, A. Sumathi Felicita, Lodd Mahendra, Masroor Ahmed Kanji, Saranya Varadarajan, A. Thirumal Raj, Shaikh Mohammed Abdul Feroz, Deepak Mehta, Hosam Ali Baeshen, Shankargouda Patil
Summary: The systematic review identified a potential association between oral microorganisms and corrosion of intra-oral metallic alloy-based dental appliances, with most studies using an in-vitro simulation.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Qiong Wu, Chuang Qiao, Lijuan Feng, Long Hao, Lianfeng Shen, Xizhong An
Summary: The development of electrochemistry-based sensors is crucial for monitoring atmospheric corrosion. In this work, an improved design of a corrosion sensor with exposed Cu teeth height increases its sensitivity under thin electrolyte layers. The sensor shows high sensitivity to low NaCl deposition and is effective in the formation of electrolyte layers.
Article
Chemistry, Physical
Kaoruho Sakata, Kenta Amemiya
Summary: Metal surface oxidation is a well-known phenomenon, but the observation of oxidation states in real time and in situ has been limited due to the requirement of high-vacuum conditions for most techniques. In this study, fluorescence-yield wavelength-dispersive X-ray absorption spectroscopy was used to achieve real-time, in situ observation of the initial stages of surface Cu oxidation, revealing a unique oxidation mechanism.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Kaoruho Sakata, Kenta Amemiya
Summary: We achieved real-time, in-situ observation of the initial stages of surface Cu oxidation using fluorescence-yield wavelength-dispersive X-ray absorption spectroscopy. The technique has applications for analyzing surface phenomena at ambient pressure, especially oxidation processes, which are crucial in various fields.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Humanities, Multidisciplinary
Clemence Fontaine, Stephane Lemoine, Charlene Pele-Meziani, Elodie Guilminot
Summary: This study demonstrates the efficient extraction of chlorides through the use of gel electrolysis for localized dechlorination treatments on ferrous or copper alloy archaeological objects. The technique offers a new effective solution for the stabilization of composite objects or for the localized treatment of copper objects.
Article
Archaeology
Martina Bernabale, Lorenzo Nigro, Daria Montanari, Caterina De Vito
Summary: This study utilized advanced techniques to analyze a set of bronze arrowheads involved in the Siege of Motya in Italy, revealing interesting correlations between alloy microstructures, corrosion patterns, production techniques, and other characteristics.
JOURNAL OF CULTURAL HERITAGE
(2021)
Article
Nanoscience & Nanotechnology
Yidong Wu, Yuluo Li, Xuli Liu, Qinjia Wang, Xiaoming Chen, Xidong Hui
Summary: Novel NiMnFeCrAlCu multi-principal-element alloys (MPEAs) were developed in this study, exhibiting excellent combination of mechanical and corrosion resistant properties, which has implications in the development of advanced marine materials.
SCRIPTA MATERIALIA
(2021)
Article
Spectroscopy
Parviz Holakooei, Omid Oudbashi, Mohammad Mortazavi, Marco Ferretti
Summary: A series of quantitative micro X-ray fluorescence analyses were conducted on different parts of archaeological copper alloys from Iran to evaluate the feasibility of quantitative XRF data for ancient copper alloy classification. The study found that corroded surfaces may provide misleading information, but areas with the lowest tin concentration may represent the closest compositional data to the absolute quantity of other elements. The quantitative mu-XRF data from stripped-patina surfaces and polished cross sections showed comparable results with ICP-OES data and can be confidently utilized for determining the diversity and technology of ancient copper alloys.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2021)
