http://www.cmdmc.com.br/redecmdmc/lab/arquivos_publicacoes/2730_Effect%20of%20temperature%20on%20Co%20electrodeposition.pdf

Effect of temperature on Co electrodeposition in the presence of boric acid

The effects of boric acid additions on the pH close to the electrode surface, on the hydrogen evolution reaction and on the internal stress in the plated films were studied for the high speed electroplating of nickel from a nickel sulfamate bath at a current density close to the nickel ion limiting current density. The study was carried out at 50 °C and pH 4.0 using a 1.55 M nickel sulfamate plating bath containing boric acid at concentrations ranging from 0 to 0.81 mol L−1. The variation of the internal strain in the plated nickel films was determined in situ using a resistance wire-type strain gauge fitted to the reverse side of the copper electrode substrate. The solution pH at a distance of 0.1 mm from the depositing nickel film was measured in situ using a miniature pH sensor assembly consisting of a thin wire-type antimony electrode and a Ag/AgCl/sat. KCl electrode housed in a thin Luggin capillary. The addition of boric acid was shown to effectively suppress the hydrogen evolution reaction at nickel electrodeposition rates (18.0 A dm−2) close to the limiting current density (~20 A dm−2). Consequently, the solution pH adjacent to the plating metal surface was maintained at a value close to that in the bulk solution and the development of high internal stresses in the deposited nickel films was avoided.

Effects of boric acid on hydrogen evolution and internal stress in films deposited from a nickel sulfamate bath

Electrolytic nickel recovery from lithium-ion batteries

Preparation and corrosion resistance of pulse electrodeposited Zn and Zn–SiC nanocomposite coatings

Effect of bias voltage on growth property of Cr-DLC film prepared by linear ion beam deposition technique

Iron (Fe), nickel (Ni), and iron-nickel (FeNi) platings were carried out potentiostatically on rotating disk electrodes The effects of boric acid on the iron and nickel reduction rates were evaluated Experimental results support the surface competition of adsorption of ferrous and nickel ions on the electrode surface in FeNi alloy deposition Boric acid prevents the electrode surface passivation on nickel reduction Furthermore, boric acid acts as a surface agent and functions as a selective membrane which blocks the passage of the reduction of nickel but permits the reduction of iron in a retarded rate The existence of boric acid alters the polarization behaviours in the FeNi system significantly

Effects of boric acid on the electrodeposition of iron, nickel and iron-nickel

During milling of the thin floor of a pocket which is located on a monolithic structure, it is very difficult to achieve high accuracy and good surface quality due to its low rigidity. In this paper, a novel approach is proposed to overcome the difficulties that are encountered during milling of the thin floor. The method is realized by using a small axial depth of cut but placing a moving support at the back surface of the thin floor during machining, in which the support will move with the cutter at the same velocity. An experimental platform is built to demonstrate the validity of the proposed method. The experimental results show that the proposed method can effectively improve the accuracy and surface quality of the thin floor of a pocket on the monolithic structure. 

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Thin floor milling using moving support

Numerical simulation and experimental investigation of structured surface generated by 3D vibration-assisted milling

Fiber-reinforced epoxy resin composites (FRERCs) are widely used in the aerospace industry. The surface defects incurred during the manufacturing process of FRERCs have detrimental effects on the aircraft during high-speed flights. To accurately and efficiently detect FRERCs’ surface defects. A novel lightweight and two-stage 3D defect detection network is proposed in this paper, i.e., NGSP-Point-Net. The first stage of the network is 3D Mask proposers; the proposers generate multiple candidate 3D surface defect masks, allowing the second stage of the network to focus on potential defect regions. The second stage of the network is the 3D merger; it classifies the candidate surface 3D defect masks to determine whether the mask is a defect or not and keeps only the target masks to obtain the final detection results. In addition, a distributed semi-real-time detection system based on the NGSP-Point-Net is constructed in this paper to simulate the online and high-speed detection of FRERCs’ surface defects in the manufacturing process. Several NGSP-Point-Net-based experiments were conducted. The metrics of the precision, accuracy, Matthews correlation coefficient (MCC), and the mean intersection of union (mIoU) reach 0.9914, 0.9896, 0.9792, and 0.9243, respectively; and the inference speed reaches about 150,000 points/s with a single Nvidia RTX 3080. Experiments demonstrate that the NGSP-Point-Net provides a new possibility to accurately and efficiently detect surface defects of FRERCs.

B.-T. Lin

Papers

Effects of boric acid on the electrodeposition of iron, nickel and iron-nickel

Thin floor milling using moving support

Numerical simulation and experimental investigation of structured surface generated by 3D vibration-assisted milling

Automatic 3D surface defects detection of fiber-reinforced epoxy resin composites

Local volumetric error calibration of a weak stiffness on-machine measuring device with a new 3-D calibrator