The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Carl D Lundin - One of the best experts on this subject based on the ideXlab platform.
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austenite preferential Corrosion Attack in 316 austenitic stainless steel weld metals
Materials & Design, 2007Co-Authors: Carl D LundinAbstract:Pitting immersion test performed on 316 austenitic stainless steel weld metals showed that austenite is the preferential phase for Corrosion Attack in 3% ferric chloride solution at critical pitting temperature. This is attributed to the primary austenite solidification mode, with the cores of the cellular dendrites depleted in chromium and nickel relative to the normal composition.
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Evaluation of initial Corrosion location in E316L austenitic stainless steel weld metals
Materials Letters, 2005Co-Authors: Carl D LundinAbstract:The initiation of Corrosion Attack in E316L austenitic stainless steel weld metal occurs preferentially in the overlapped heat affected zone (HAZ), especially along the fusion line for fissure-free samples, and at the tips of microfissures for fissure-containing samples.
Azzura Ismail - One of the best experts on this subject based on the ideXlab platform.
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Mitigation of Corrosion Attack on carbon steel coated cermet alloy in different anion contents
2017Co-Authors: Muhamad Azrin Mohd Khalid, Azzura IsmailAbstract:This research study evaluated the Corrosion mechanism Attack on carbon steel coated with cermet alloys (WC-9% Ni) in seawater at different sulphate-to-chloride ratios. The four different sulphate-to-chloride ratios were synthesised with the same seawater salinity of 3.5 % and same pH of real seawater. The Corrosion tests involved immersion and electrochemical tests. The immersion test is used to determine the cermet coating ability to withstand the Corrosion Attack based on different ratios of anions present in the seawater at different periods of immersion. The Corrosion Attack was characterized by optical and Scanning Electron Microscopy (SEM). The aggressive anions present in the seawater influenced the Corrosion Attack on the cermet coating. For immersion test, results revealed that increasing sulphate more than chloride, increased the weight loss of cermets. The electrochemistry analysis showed that the passive layer forms on cermet coating prevented the material from further Corrosion Attack. Howeve...
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the influence of porosity on Corrosion Attack of austenitic stainless steel
Journal of Physics: Conference Series, 2017Co-Authors: Zulaikha Abdullah, Azzura Ismail, S. AhmadAbstract:Porous metals also known as metal foams is a metallic body having spaces orpores through which liquid or air may pass. Porous metals get an attention from researchers nowadays due to their unique combination of properties includes excellent mechanical and electrical, high energy absorption, good thermal and sound insulation and water and gas permeability. Porous metals have been applied in numerous applications such as in automotive, aerospace and also in biomedical applications. This research reveals the influence of Corrosion Attack in porous austenitic stainless steel 316L. The cyclic polarization potential analysis was performed on the porous austenitic stainless steel 316L in 3.5% NaCl solution. The morphology and the element presence on the samples before and after Corrosion Attack was examined using scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) respectively to determine the Corrosion mechanism structure. The cyclic polarization potential analysis showed the result of (E corr ) for porous austenitic stainless steel type 316L in the range of -0.40v to -0.60v and breakdown potential (E b ) is -0.3v to -0.4v in NaCl solution.
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Corrosion Performance of Inconel 625 in High Sulphate Content
IOP Conference Series: Materials Science and Engineering, 2016Co-Authors: Azzura IsmailAbstract:Inconel 625 (UNS N06625) is a type of nickel-chromium-molybdenum alloy with excellent Corrosion resistance in a wide range of corrosive media, being especially resistant to pitting and crevice Corrosion. However, in aggressive environment, Inconel 625 will suffer Corrosion Attack like other metals. This research compared the Corrosion performance of Inconel 625 when exposed to higher sulphate content compared to real seawater. The results reveal that Inconel 625 is excellent in resist the Corrosion Attack in seawater. However, at increasing temperature, the Corrosion resistance of this metal decrease. The performance is same in seawater with high sulphate content at increasing temperature. It can be concluded that sulphate promote perforation on Inconel 625 and become aggressive agents that accelerate the Corrosion Attack.
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the Corrosion Attack on stainless steel 316l and wc co in high sulphate chloride ratio
Advanced Materials Research, 2015Co-Authors: Azzura IsmailAbstract:Austenitic stainless steels and cermets alloy has been used extensively in many sectors due to their highly resistance to Corrosion Attack and excel in mechanical properties. However, in corrosive media both materials are susceptible to Corrosion Attack especially in seawater and high temperature. Cermet alloys are a combination of ceramic and metal. Therefore, cermets exist in high Corrosion resistance in aqueous media and the Corrosion rate is complex to identify. This paper presents the Corrosion mechanism of 316L and cermets alloy exposed to high concentration of sulphate in the salinity of seawater. The solution (media) was prepared according to the same composition as seawater including pH, salinity and dissolved oxygen. The Corrosion mechanism were characterized to breakdown potential (Eb) of 316L which are the potential once reaches a sufficiently positive value and also known as pitting potential. This is the most point where localized Corrosion susceptibility to evaluate and considered a potential, which could be an appropriate point according to any given combination of material/ambient/testing methods. The Eb value of 316L in high sulphate are higher compared to seawater in every temperature which elucidate that some anions accelerate Corrosion Attack whereas some anions such as sulphate behaves as inhibiting effect to 316L.
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Effect of Immersion and Green Inhibitor to Corrosion Rate of Carbon Steel
Advanced Materials Research, 2015Co-Authors: Azzura Ismail, Mohd Fuzaimie Ahmad FuadAbstract:Corrosion is the reaction between the material and the environment that cause degradation of the material. Corrosion reduces the essential properties of materials such as strength, appearance, toughness and life expectancy. Carbon steels are composed of a mixture of metallic iron and carbon and being used extensively in every sector due to good mechanical properties and good cost. However, carbon steel are every susceptible to Corrosion Attack especially in corrosive environment. The use of inhibitors is one of the best options to protect against Corrosion on metals and alloys especially in a closed system. Inhibitor is a chemical substance which can reduce Corrosion Attack when added into electrolyte. The organic inhibitor used in this study was from banana peel (scientific name Musa sapieutum) to extract tannin-a compound which can provide protective layer on metal [1-3]. The results elucidate that banana peel can be used as green inhibitor on canbon steel, however, the effect only can be seen when added with 10% and more. The immersion test was done to evaluate the effect of Corrosion product to Corrosion rate. The results explained that Corrosion rate fluctuated during immersion period due to developed and dissolved of soluble product into electrolyte. The research provide a set of data elucidate that Corrosion product developed on carbon steel cannot provide Corrosion protection on carbon steel, however, using green inhibitor in high concentrations which is purely not harmful to environment could prevent Corrosion Attack on carbon steel.
Valentyn Tsisar - One of the best experts on this subject based on the ideXlab platform.
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Effect of Structural State and Surface Finishing on Corrosion Behavior of 1.4970 Austenitic Steel at 400 and 500 °C in Flowing Pb-Bi Eutectic With Dissolved Oxygen
Journal of Nuclear Engineering and Radiation Science, 2018Co-Authors: Valentyn Tsisar, Carsten Schroer, Olaf Wedemeyer, Aleksandr Skrypnik, Jürgen KonysAbstract:The effect of structural state (solution annealed (SA) and after 40% cold work (CW)) and surface finishing (turning, grinding, and polishing) on the Corrosion behavior of austenitic 1.4970 (15-15 Ti) steel in flowing (2 m/s) Pb-Bi eutectic containing 10−7 mass% dissolved oxygen at 400 °C and 10−6 mass% O at 500 °C is investigated. At 400 °C for ∼13,000 h, the Corrosion losses are minor for steel in both structural states and for surfaces finished by turning and grinding—a thin Cr-based oxide film is formed. In contrast, the polished surface showed initiation of solution-based Corrosion Attack with the formation of iron crystallites and preferential propagation along the grain boundaries. The depth of Corrosion Attack does not exceed 10 μm after ∼13,000 h. At 500 °C for 2000 h, the samples in both structural states showed general slight oxidation. Cold-worked steel underwent a severe groove-type and pit-type solution-based Attack of 170 μm in maximum depth, while the SA sample showed only sporadic pit-type Corrosion Attack to the depth of 45 μm in maximum.
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Effect of Structural State of Austenitic 15-15 Ti Steel on Initiation and Propagation of Solution-Based Corrosion Attack in Flowing Liquid Pb-Bi Eutectic at 400 and 500 °C
Volume 2: Plant Systems Structures Components and Materials, 2017Co-Authors: Valentyn Tsisar, Carsten Schroer, Olaf Wedemeyer, Aleksandr Skrypnik, Jürgen KonysAbstract:Investigations of Corrosion behavior of austenitic 1.4970 (15–15 Ti) steel in Pb-Bi eutectic at 400–550 °C show an effect of structural state of material with identical composition on the depth of solution-based Attack. Structural boundaries play a role of active paths along which the solution-based liquid-metal Attack develops preferentially. In this view it is important to have quantitative and qualitative information about grain boundary type distribution in material and state of boundaries with respect to the accumulated strains. The EBSD analysis performed on 1.4970 steel in solution-annealed and cold-worked (40% reduction) states indicates that deformation increases substantially the total length of strained boundaries. The increase in fraction of active diffusion paths results in acceleration of Corrosion Attack on steel via solution.
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Morphological and compositional features of Corrosion behavior of SUS410–SUS410, SUS316–SUS316 and SUS410–SUS316 TIG welded joints in Li
Fusion Engineering and Design, 2012Co-Authors: Valentyn Tsisar, Masatoshi Kondo, Takeo Muroga, Takuya Nagasaka, Izuru MatushitaAbstract:Abstract The Corrosion behavior of SUS410–SUS410, SUS316–SUS316, SUS410–SUS316 tungsten inert gas welded joints in static Li at 600 °C for 250 h was investigated as applied for lithium-cooled systems of fusion reactor. The different regions of welded joints (base metal, weld metal, heat affected zone, fusion layer) possessed by the same phase state (ferrite or austenite) showed no substantial difference in the Corrosion behavior under the given conditions of test. The Corrosion Attack resulted in the marked depletion of corresponded near-surface layers with chromium and nickel. The clear Corrosion induced refining of surface grain structure, in comparison with initial surface morphology (polished) and corresponded bulk grain size, was observed indicating about the prevalence of the grain boundary Corrosion Attack during which the low-angle sub-boundaries transform into the large-angle due to the increase in their defectiveness.
Izuru Matushita - One of the best experts on this subject based on the ideXlab platform.
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Morphological and compositional features of Corrosion behavior of SUS410–SUS410, SUS316–SUS316 and SUS410–SUS316 TIG welded joints in Li
Fusion Engineering and Design, 2012Co-Authors: Valentyn Tsisar, Masatoshi Kondo, Takeo Muroga, Takuya Nagasaka, Izuru MatushitaAbstract:Abstract The Corrosion behavior of SUS410–SUS410, SUS316–SUS316, SUS410–SUS316 tungsten inert gas welded joints in static Li at 600 °C for 250 h was investigated as applied for lithium-cooled systems of fusion reactor. The different regions of welded joints (base metal, weld metal, heat affected zone, fusion layer) possessed by the same phase state (ferrite or austenite) showed no substantial difference in the Corrosion behavior under the given conditions of test. The Corrosion Attack resulted in the marked depletion of corresponded near-surface layers with chromium and nickel. The clear Corrosion induced refining of surface grain structure, in comparison with initial surface morphology (polished) and corresponded bulk grain size, was observed indicating about the prevalence of the grain boundary Corrosion Attack during which the low-angle sub-boundaries transform into the large-angle due to the increase in their defectiveness.
Shoufeng Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of Corrosion Attack on the fatigue behavior of an as cast mg 7 gd 5 y 1 nd 0 5 zr alloy
Materials & Design, 2015Co-Authors: Shoufeng Wang, D K Xu, Bo Wang, Chuang DongAbstract:Abstract Through investigating and comparing the fatigue behavior of an as-cast Mg–7%Gd–5%Y–1%Nd–0.5%Zr alloy in both laboratory air and 3.5 wt.% NaCl solution, the effect of Corrosion Attack on fatigue crack initiation has been disclosed. The S–N curves showed that the fatigue strength in air was 120 MPa and not sensitive to the loading frequency, whereas the fatigue strength in NaCl solution decreased from 80 MPa to 60 MPa with the loading frequency decreasing from 20 Hz to 5 Hz. Observations to fracture surfaces demonstrated that in air, fatigue cracks preferentially initiated at the oxide inclusions. However, the fatigue crack initiation in NaCl solution was associated with Corrosion pits. Moreover, multiple fatigue cracks initiated at pits on fracture surfaces of Corrosion fatigue failed samples when the loading frequency decreased to 5 Hz. Based on the measured “defect area” of oxide inclusions, the predicted fatigue strength in air could be well fitted with the experimental data. However, due to the occurrence of hydrogen embrittlement and crack initiation at multiple sites, the fatigue strength of samples tested in NaCl solution cannot be predicted.
