Article
Materials Science, Coatings & Films
Bangmaya Satpathy, Sambedan Jena, Siddhartha Das, Karabi Das
Summary: This study describes the electrodeposition of mirror-bright Au coatings from a cyanide-free thiosulphate-based bath. Quantum chemical calculations are carried out to study the electronic properties of potential bath additives. DABCO and NA are selected as bath additives based on these studies. The coatings deposited from the formulated bath have a smooth and compact microstructure, and their hardness decreases with an increase in current density, as shown by the nano-hardness tests.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Chemical
Kai Yan, Peisen Huang, Mingzhu Xia, Xingen Xie, Lin Sun, Wu Lei, Fengyun Wang
Summary: This study used electrodialysis and electrodeposition combined method to treat the spent electroless nickel plating bath, and the experimental results showed that this method has the ability of high recovery of Ni2+ and removal of HPO32-, with low energy consumption.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Electrochemistry
Carolina Ramirez, Benedetto Bozzini, Jorge A. Calderon
Summary: This study investigates the use of triethanolamine (TEA) as a cyanide-free electrolyte for copper electrodeposition. The results show that TEA forms stable complexes with copper and acts as a surface modifier, promoting nucleation and lower reduction rates, resulting in smooth and homogeneous copper deposition.
ELECTROCHIMICA ACTA
(2022)
Article
Materials Science, Multidisciplinary
D. P. Weston, D. Albusalih, H. Hilton-Tapp, D. Statharas, S. P. Gill, J. Navajas, J. Cornec, N. J. Weston
Summary: In this study, the co-deposition process of silicon carbide nanoparticles in an electrodeposited metallic cobalt matrix was investigated using pulse reverse plating with the inclusion of an anionic surfactant. It was found that the addition of anionic surfactant increased the SiC content in the coatings produced by PRP.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Bangmaya Satpathy, Sambedan Jena, Siddhartha Das, Karabi Das
Summary: Cyanide-based baths are widely used for electroplating silver and gold, but their toxicity and environmental pollution have led to the development of cyanide-free alternatives. This review provides an overview of various cyanide-free electroplating baths.
INTERNATIONAL MATERIALS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Susumu Arai, Taishi Kikuhara, Masahiro Shimizu, Masaomi Horita
Summary: The Ag/CNT composite plating film prepared using a cyanide-free bath showed superior electrical contact characteristics compared to a Ag plating film in a H2S gas corrosion test. The reduced amount of silver sulfide (Ag2S) generated on the Ag/CNT composite film compared to the Ag film, alongside the higher contact angle with water, likely contributed to better electrical contact resistance after the corrosion test.
Article
Materials Science, Coatings & Films
Bangmaya Satpathy, Sambedan Jena, Siddhartha Das, Karabi Das
Summary: In this study, silver coatings were deposited from a novel cyanide-free thiosulphate-based electroplating bath containing specific chemicals. Both LSV and EIS experiments were performed to analyze metal-complex interactions and reduction mechanisms during electroplating. Results showed that pulse galvanostatic deposition method can produce compact and adherent silver coatings with a mirror-finish appearance, suitable for aesthetic usage.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Electrochemistry
Atiqah Binti Jasni, Sachio Yoshihara, Fumio Aiki, Hideki Watanabe
Summary: This research explores the use of pyrimidine derivatives as complexing agents in a cyanide-free silver deposition process on copper substrates. It was found that when 2,4-pyrimidinedione (Uracil) or 5-methyluracil (Thymine) was added to the plating solution, a semi-bright silver film was deposited on the copper substrates. The cyanide-free silver solution with a DMH and Uracil formulation also exhibited a high current efficiency compared to cyanide-type silver solutions.
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
(2022)
Article
Chemistry, Physical
Bangmaya Satpathy, Sambedan Jena, Siddhartha Das, Karabi Das
Summary: Mirror-bright silver (Ag) coatings are electrodeposited from a cyanide-free thiosulphate-based bath with cetrimonium bromide (CTAB) as a surfactant. The presence of CTAB leads to the nucleation of Ag in the progressive mode, resulting in a continuous and uniform coating. The coatings deposited in the presence of CTAB show better resistance to tarnishing in a sulphide environment compared to those deposited without CTAB.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Lorenzo Fabbri, Walter Giurlani, Giulia Mencherini, Antonio De Luca, Maurizio Passaponti, Emanuele Piciollo, Claudio Fontanesi, Andrea Caneschi, Massimo Innocenti
Summary: The role of thiourea as an organic additive in the nucleation and growth mechanism for copper deposition was studied and its application in decorative electroplating and fashion accessory industries was explored. The research showed that progressive nucleation was crucial for obtaining a shiny and homogeneous copper film, but an excess of thiourea could lead to parasitic adsorption reactions on the substrate surface. The optimal concentration of thiourea was determined to be 60 ppm for the used formulation of copper plating.
Article
Engineering, Chemical
Arthur Filgueira de Almeida, Heleno da Costa Neto, Renato Alexandre Costa de Santana, Jose Jailson Nicacio Alves, Ana Regina Nascimento Campos, Shiva Prasad
Summary: This study evaluates the influence of nickel sulphate and sodium molybdate concentrations on the electrodeposition of Ni-Mo alloys in potassium-sodium tartrate baths. The results show that the Mo content has the greatest impact on the chemical composition of the coatings. High-quality Ni-Mo coatings can be obtained with Mo content in the range of 18-44%, even higher than those obtained from citrate baths.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Dong Peng, Dalong Cong, Kaiqiang Song, Xingxing Ding, Xuan Wang, Yixin Bai, Xinrui Yang, Changqing Yin, Yuxin Zhang, Jinsong Rao, Min Zhang, Zhongsheng Li
Summary: The study found that the addition of 4-cyanopyridine can result in bright Al-Mn coatings in ionic liquids, with superior brightening effects compared to the other two additives. The bright Al-Mn coatings displayed superior corrosion resistance relative to the matte coatings, attributed to their unique nanocrystalline structure that increased the number of grain boundaries and accelerated the formation of the protective layer of the corrosion products.
