Enhancement of Corrosion Resistance and Microbial Protection Analysis of a Rosin Coating with the Incorporation of Leucaena leucocephala

Leucaena leucocephala leaves extract (LLE) was incorporated as an additive in a new coating formulation. The coatings containing different wt.% of the extracts were analysed by optical characterizations and we proceeded to the antimicrobial assessment. The coating was applied onto the surface of stainless steel grade 316L and immersed in seawater for 50 days. A batch of specimens was collected every 10 days and evaluated through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and scanning electron microscope with energy dispersive X-ray (SEM/EDX). The incorporation of 3 wt.% LLE into the coating (P2) matrix remarkably boosted the barrier quality of the coating.

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Surface Analysis for Signs of Corrosion of Fixed Orthodontic Appliances Used In Vivo

Advances in Materials Science ◽

10.1515/adms-2016-0012 ◽

2016 ◽

Vol 16 (3) ◽

pp. 5-14

Author(s):

M. Łępicka ◽

M. Grądzka-Dahlke

Keyword(s):

Corrosion Resistance ◽

Electron Microscope ◽

Surface Defects ◽

Orthodontic Appliances ◽

Casting Defects ◽

X Ray ◽

Fixed Orthodontic Appliances ◽

Scanning Electron

Abstract The objective was to evaluate and assess the surface quality of fixed orthodontic appliances after intraoral usage for several months. Nine sets of orthodontic brackets by three different manufacturers and twelve archwires differing in chemical composition were analyzed in a scanning electron microscope with an energy dispersive X-ray analyzer for signs of corrosion. Obtained results showed that the majority of the evaluated appliances displayed no traces of corrosion. Machining or casting defects hardly ever act as the origins of corrosion processes. However, some samples displayed signs of corrosion of a galvanic and pitting nature. The authors claim, that despite the surface defects, most of the appliances were able to retain the desired corrosion resistance, although in some cases these flaws could act as the origin of corrosion processes.

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Effects of RE Micro-Alloying Additions on the Corrosion Behavior of an Al-Mg-Si Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.729.40 ◽

2017 ◽

Vol 729 ◽

pp. 40-45 ◽

Cited By ~ 1

Author(s):

Wei Bing Kong ◽

Xin Xin Li ◽

Xin Ping Hu

Keyword(s):

Corrosion Resistance ◽

Electron Microscope ◽

Corrosion Rate ◽

Electrochemical Impedance ◽

X Ray Diffraction ◽

Strengthening Phase ◽

Melting Method ◽

X Ray ◽

Alloying Additions ◽

Scanning Electron

AlMg5Si1-xRE (x=0%, 0.9%) alloys were prepared by resistance melting method, and the phases of alloy were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The effects of RE (rare earth) on the corrosion resistance of AlMg5Si1 alloy immersed in seawater in different time were investigated by potential measurements and electrochemical impedance spectroscopy. The results showed that the strengthening phase β (Mg2Si) was short rod like and dispersing distributed in α (Al) in the AlMg5Si1 alloy after adding 0.9% RE. Under the conditions of seawater immersion, the corrosion rate of the AlMg5Si1RE0.9 alloy was less than that of AlMg5Si1 alloy, and the corrosion rate of AlMg5Si1RE0.9 immersed 12h in seawater was the slowest, 5.7 uA·cm-2. The improved corrosion resistance is due to the changes in microstructure and corrosion products.

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Influence of the Nb and V Addition on the Microstructure and Corrosion Resistance of the Fe-B-Co-Si Alloy

Materials ◽

10.3390/ma14144045 ◽

2021 ◽

Vol 14 (14) ◽

pp. 4045

Author(s):

Rafał Mech ◽

Jolanta Gąsiorek ◽

Amadeusz Łaszcz ◽

Bartosz Babiarczuk

Keyword(s):

Corrosion Resistance ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Significant Influence ◽

Corrosion Performance ◽

X Ray ◽

Final Performance ◽

Differential Calorimeter ◽

Comparison Of The Results ◽

Scanning Electron

The paper presents a comparison of the results of the corrosion resistance for three Fe-B-Co-Si-based newly developed alloys with the addition of Nb and V. The corrosion performance differences and microstructure variations were systematically studied using scanning electron microscope, electric corrosion equipment, X-ray diffractometer, and differential calorimeter. It has been shown that each alloying addition increased the corrosion resistance. The highest corrosion resistance obtained by potentiodynamic polarization was found for the alloy with both Nb and V addons (Fe57Co10B20Si5Nb4V4) and lowest in the case of the basic four-element Fe62Co15B14Si9 material. This shows that the proper choice of additions is of significant influence on the final performance of the alloy and allows tailoring of the material for specific applications.

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Effect of Bismuth on the Microstructure and Corrosion Resistance of Galvanized Coating

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.391-392.1183 ◽

2011 ◽

Vol 391-392 ◽

pp. 1183-1188 ◽

Cited By ~ 1

Author(s):

Jian Hua Wang ◽

Xing Ming Wang ◽

Chun Mei Liu ◽

Xu Ping Su ◽

Chang Jun Wu ◽

...

Keyword(s):

Corrosion Resistance ◽

Electron Microscope ◽

Scanning Electron Microscope ◽

Electrochemical Corrosion ◽

Energy Dispersive ◽

Phase Layer ◽

Corrosion Tests ◽

X Ray ◽

Galvanized Coating ◽

Scanning Electron

The microstructure of the galvanized coating was investigated using scanning electron microscope equipped with energy dispersive X-ray spectroscope. The immersing and electrochemical corrosion tests were carried out to study the corrosion resistance of the galvanized coating. The addition of Bi in Zn-bath affects remarkably the morphology of the galvanized coating. The thickness of δ + ζ phase layer in the coating reaches the maximum when the content of Bi in Zn-bath is 0.5 wt.%. The corrosion resistance of the galvanized coating declines with the increase of the content of Bi.

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ANALISIS PENGARUH LAJU PUTAR TERHADAP KOROSI BAJA KARBON API 5LX65 MENGGUNAKAN METODE ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

Jurnal Teknologi Bahan dan Barang Teknik ◽

10.37209/jtbbt.v2i1.17 ◽

2012 ◽

Vol 2 (1) ◽

pp. 1

Author(s):

Agus Solehudin ◽

Asep Lukman

Keyword(s):

Electron Microscope ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Scanning Electron Microscope ◽

Energy Dispersive Spectroscopy ◽

Electrochemical Impedance ◽

Energy Dispersive ◽

X Ray ◽

Scanning Electron

Pada percobaan ini, telah dipelajari pengaruh laju putar terhadap laju korosi baja karbon API 5LX65 yang direndam selama 24 jam dalam larutan NaCl 3,5% + 500 mg/L H2S menggunakan metode EIS (Electrochemical Impedance Spectroscopy) pada suhu 50oC dan pH 4 dengan variasi laju putar 50 rpm, 150 rpm, dan 250 rpm. Hasil percobaan memperlihatkan pergeseran dan penyempitan kurva setengah lingkaran impedansi imaginer terhadap impedansi real, dengan meningkatnya laju putar dari 50 rpm sampai dengan 250 rpm. Hal ini mengindikasikan bahwa aktifitas pelarutan baja meningkat dengan percepatan laju putar. Nilai Cdl meningkat dengan meningkatnya laju putar. Nilai tahanan polarisasi (Rp) semakin menurun dengan meningkatnya laju putar, sementara nilai tahanan larutan (Rs) relatif tidak berubah. Potensial korosi pada laju putar 50 rpm, 150 rpm dan 250 rpm stabil pada -517 mV hingga -508 mV terhadap Ag/AgCl. Gabungan pengamatan Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) dan X-Ray Diffractomer (XRD) menunjukkan terbentuknya lapisan produk korosi. Hasil analisis XRD spesimen uji yang dikorosikan pada suhu 50oC selama 24 jam menunjukkan bahwa lapisan produk korosi mengandung besi sulfida (FeS). Morfologi permukaan spesimen ini memperlihatkan adanya korosi sumuran.Kata kunci: laju putar, korosi, baja karbon, EIS, H2S

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Improvement on Fully Filled Through Silicon Vias by Optimized Sputtering and Electroplating Conditions

Materials ◽

10.3390/ma12223713 ◽

2019 ◽

Vol 12 (22) ◽

pp. 3713 ◽

Cited By ~ 1

Author(s):

Fei Zhao

Keyword(s):

Electron Microscope ◽

Integrated Circuit ◽

Seed Layer ◽

High Reliability ◽

Through Silicon Vias ◽

X Ray ◽

Layer Structures ◽

Silicon Vias ◽

Scanning Electron

The high reliability of electroplating through silicon vias (TSVs) is an attractive hotspot in the application of high-density integrated circuit packaging. In this paper, improvements for fully filled TSVs by optimizing sputtering and electroplating conditions were introduced. Particular attention was paid to the samples with different seed layer structures. These samples were fabricated by different sputtering and treatment approaches, and accompanied with various electroplating profile adjustments. The images were observed and characterized by X-ray equipment and a scanning electron microscope (SEM). The results show that optimized sputtering and electroplating conditions can help improve the quality of TSVs, which could be interpreted as the interface effect of the TSV structure.

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Fabrication of W/Cu Functionally Gradient Materials by Multi-Billet Extrusion

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.1511 ◽

2005 ◽

Vol 475-479 ◽

pp. 1511-1516

Author(s):

Jian Xin Xie ◽

Shi Bo Li ◽

Shu Chen

Keyword(s):

Electron Microscope ◽

Extrusion Process ◽

X Ray Diffraction ◽

Functionally Gradient Materials ◽

Homogeneous Microstructure ◽

Gradient Materials ◽

X Ray ◽

Functionally Gradient ◽

Scanning Electron

W/Cu functionally gradient materials (FGMs) are fabricated by a novel process—multi-billet extrusion (MBE). Different W/Cu superfine powders made by mechanical alloying (MA) are used to improve the sinterability of W/Cu compacts. Good quality of three-layer W/Cu extrudes are obtained after confirming the extrusion parameters and the type and the content of binder during extrusion process. The green products are pressureless sintered at the temperature range of 1100-1300 oC for 1 h. W/Cu FGMs with relatively high density and high homogeneous microstructure are attained after sintering at 1200 oC for 1 h. The mechanisms for the enhance of sinterability and improvement of density of the mechanical alloyed (MAed) W-Cu powder products have been discussed. X-ray diffraction and scanning electron microscope are used to identify and observe phase constitution and microstructure, respectively.

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Corrosion Behavior of Fe-12Cr-2Mo Stainless Steel in Na2SO4-50%NaCl with Flowing Ar-20%O2 Environments at High Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1107.727 ◽

2015 ◽

Vol 1107 ◽

pp. 727-732

Author(s):

Muhamad Izhar Sahri ◽

Norinsan Kamil Othman ◽

Abdul Razak Daud ◽

Azman Jalar

Keyword(s):

Stainless Steel ◽

Electron Microscope ◽

High Temperature ◽

Chromium Concentration ◽

Oxide Scales ◽

X Ray Diffraction ◽

Salt Mixture ◽

Cross Sectional ◽

X Ray ◽

Scanning Electron

The behavior of Fe-12Cr-2Mo stainless steel exposed isothermally in tube furnace at 700°C for 10 h had been studied in different environments; of mixed environment (Ar-20%O2 with coated Na2SO4-50%NaCl salts), molten salt (Na2SO4-50%NaCl) and dry oxygen (Ar-20%O2) atmospheres. The exposed samples were characterized by using optical microscopy (OM), scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD). The results indicated that, sample exposed in mixed environments undergoes highest corrosion rate compared with other samples. The main phase exists in all samples generally were iron-rich oxides which non-protective and thick. Conversely, EDX analysis on cross-sectional samples revealed the Cr-enrichment developed underneath the iron-rich oxide scales as the chromium concentration increases towards near the substrate. In presence of salt mixture, the oxide scales undergo spallation, however there is no crack observed. The catastrophic corrosion sample was occurred in combined environment due to the oxidation induced by the chloridation and sulfidation phenomena as well.

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Fabrication of Accurate Diamond - Metal Composite Cutting Blade by Electrotyping Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.304-305.57 ◽

2006 ◽

Vol 304-305 ◽

pp. 57-61

Author(s):

L.L. Fang ◽

Bing Lin Zhang ◽

Ning Yao

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Ph Value ◽

Photoemission Spectroscopy ◽

Metal Composite ◽

X Ray Diffraction ◽

Electrolytic Solution ◽

X Ray ◽

Scanning Electron

In this paper, we report that the experimental results of fabricated diamond-metal composite film. Electrotyping method was used to deposit the thick film. During the deposition, low internal stress electrolytic solution, the electric current density of cathode, PH value, temperature, the distance between cathode and anode, the pretreatment of motherboard cathode were selected simultaneously. It was found that stirring strongly affected the quality of the film. Especially stirring velocity affected the distribution of diamond grains. Scanning electron microscope (SEM), X-ray photoemission spectroscopy (XPS) and X-ray diffraction (XRD) were used to measure the surface morphology, the crystal microstructure, diamond grains distribution and the chemical environment of the film.

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