In this study, the corrosion resistance mechanism of the Te and heat treatments on martensitic stainless steel (15–5PH steel) was investigated. Heat treatment affected the dislocation density of the Te-containing 15–5PH steel and reduced its corrosion tendency. Electrochemical dissolution of the MnS-Te inclusions induced pitting corrosion. Heat treatment significantly affects the potential difference between the Te-modified inclusions and the steel matrix, consequently influencing the emergence of pitting corrosion. Heat treatment improved the anti-corrosion properties of 15–5PH steel by transforming it from an active state to a passive state. The Mott-Schottky test results show that the passive film always exhibits n-type semiconductor characteristics and that the defect density of the passive film is reduced by the heat treatment. Heat treatment facilitated the enrichment of Cr, Te, and TeO3 in the passivation film, resulting in its improved stability and corrosion resistance. The formation of an insoluble or slowly dissolved tellurite film through Te anodic oxidation, along with the self-healing properties of TeO3, improved the repassivation capability of the passivation film of the steel. 

Influence mechanism of heat treatment on corrosion resistance of Te-containing 15-5PH stainless steel

Abstract Graphene oxide (GO) is a monolayer of oxidized graphene which is a convenient and potential candidate in a wide range of fields of applications like electronics, photonics, optoelectronics, energy storage, catalysis, chemical sensors, and many others. GO is often composed of various oxygen-containing groups such as hydroxyl, carboxyl, and epoxy. One appealing method for achieving graphene-like behavior with sp 2 hybridized carbon is the reduction of GO i.e. formation of reduced graphene oxide (RGO). A stepwise reduction GO to form a family of RGO, containing various quantities of oxygen-related defects was carried out. Herein, the defects related chemical and physical properties of GO and the RGO family were studied and reported in an effort to understand how the properties of RGO vary with the reduction rate. Although there are several reports on various features and applications of GO and RGO but a systematic investigation of the variation of the physical and chemical properties in RGO with the varying quantities of oxygeneous defects is imperative for the engineered physical properties in achieving the desired field of applications. We have attempted to look at the role of sp 2 and sp 3 carbon fractions, which are present in RGO-based systems, and how they affect the electrical, optoelectronic, and adsorption characteristics. 

Stepwise reduction of graphene oxide and studies on defect-controlled physical properties

Macroscale and microscale structural mechanisms capable of delaying the fracture of low-temperature and rapid pressureless Ag sintered electronics packaging

Effects of transition metals for silicon-based lithium-ion battery anodes: A comparative study in electrochemical applications

Due to the low capacity, low working potential, and lithium coating at fast charging rates of graphite material as an anode for Li-ion batteries (LIBs), it is necessary to develop novel anode materials for LIBs with higher capacity, excellent electrochemical stability, and good safety. Among different transition-metal oxides, AB2O4 spinel oxides are promising anode materials for LIBs due to their high theoretical capacities, environmental friendliness, high abundance, and low cost. In this work, a novel, porous Zn0.5Mg0.5FeMnO4 spinel oxide was successfully prepared via the sol–gel method and then studied as an anode material for Li-ion batteries (LIBs). Its crystal structure, morphology, and electrochemical properties were, respectively, analyzed through X-ray diffraction, high-resolution scanning electron microscopy, and cyclic voltammetry/galvanostatic discharge/charge measurements. From the X-ray diffraction, Zn0.5Mg0.5FeMnO4 spinel oxide was found to crystallize in the cubic structure with Fd3¯m symmetry. However, the Zn0.5Mg0.5FeMnO4 spinel oxide exhibited a porous morphology formed by interconnected 3D nanoparticles. The porous Zn0.5Mg0.5FeMnO4 anode showed good cycling stability in its capacity during the initial 40 cycles with a retention capacity of 484.1 mAh g−1 after 40 cycles at a current density of 150 mA g−1, followed by a gradual decrease in the range of 40–80 cycles, which led to reaching a specific capacity close to 300.0 mAh g−1 after 80 cycles. The electrochemical reactions of the lithiation/delithiation processes and the lithium-ion storage mechanism are discussed and extracted from the cyclic voltammetry curves.

Design and Performance of a New Zn0.5Mg0.5FeMnO4 Porous Spinel as Anode Material for Li-Ion Batteries

Power cycling tests under driving ΔTj = 125 °C on the Cu clip bonded EV power module

Electrochemical properties of the Si thin-film anode deposited on Ti-Nb-Zr shape memory alloy in Li-ion batteries

Reduction Time Effect on the Dielectric Characteristics of Reduced-Graphene-Oxide--Encapsulated Barium Titanate Powder Fillers

Alkali vanadium phosphates are promising electrode materials for next-generation ion batteries. However, the materials have inherent problems of low electronic conductivity due to phosphate group. We present here a method to overcome the issue of alkali vanadium phosphate by building effective carbon backbone in alkali vanadium phosphate and carbon composite. The carbon backbone not only provides pathways for an electron but also suppresses agglomeration of particles, resulting in efficient ion diffusion and electron transfer in the composite. We applied the method for developing rhombohedral Li3V2(PO4)3 material which is a different phase from the well-known monoclinic Li3V2(PO4)3. Detailed redox mechanisms and associated structural changes of the rhombohedral Li3V2(PO4)3 materials are investigated as both cathode and anode for lithium-ion batteries to demonstrate the importance of the formation of efficient carbon composite materials of phosphate-based electrode materials. 

Formation of Effective Carbon Composite Structure for Improving Electrochemical Performances of Rhombohedral Li3V2(PO4)3 as Both Cathode and Anode Materials for Lithium Ion Batteries

Thermo-compression bonding (TCB) properties of Cu/SnAg pillar bumps on electroless palladium immersion gold (EPIG) were evaluated in this study. A test chip with Cu/SnAg pillar bumps was bonded on the surface-finished Cu pads with the TCB method. The surface roughness of the EPIG was 82 nm, which was 1.6 times higher than that of the ENEPIG surface finish because the EPIG was so thin that it could not flatten rough bare Cu pads. From the cross-sectional SEM micrographs, the filler trapping of the TC-bonded EPIG was much higher than that of the ENEPIG sample. The high filler trapping of the EPIG sample was due to the high surface roughness of the EPIG surface finish. The contact resistance increased as the thermal cycle time increased. The increase of the contact resistance with 1500 cycles of the thermal cycle test was 26% higher for the EPIG sample than for the ENEPIG sample.

/pdf/thermo-compression-bonding-of-cu-snag-pillar-bumps-with-1s0kaovy.pdf

Thermo-Compression Bonding of Cu/SnAg Pillar Bumps with Electroless Palladium Immersion Gold (EPIG) Surface Finish

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Power cycling tests under driving ΔTj = 125 °C on the Cu clip bonded EV power module

Electrochemical properties of the Si thin-film anode deposited on Ti-Nb-Zr shape memory alloy in Li-ion batteries

Reduction Time Effect on the Dielectric Characteristics of Reduced-Graphene-Oxide--Encapsulated Barium Titanate Powder Fillers

Formation of Effective Carbon Composite Structure for Improving Electrochemical Performances of Rhombohedral Li3V2(PO4)3 as Both Cathode and Anode Materials for Lithium Ion Batteries

Thermo-Compression Bonding of Cu/SnAg Pillar Bumps with Electroless Palladium Immersion Gold (EPIG) Surface Finish