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Search Results: 1 - 10 of 14307 matches for " corrosion resistance "
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Corrosion in Tap Water and Hot Water Supply Facilities of Stainless Steel Type 304 Pipes  [PDF]
Noriyuki Tanaka, Shigeru Sato, Ippei Watanabe, Yutaka Yamada, Osamu Sakurada
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.91005
Abstract: We performed corrosion case study and corrosion tests to assess the corrosion resistance of stainless steel type 304 pipes in tap water and hot water facilities. Circulating test equipment used for corrosion tests and two types of sample, plates and straight pipe specimens, were examined under different conditions of residual chlorine concentration in the test water. The results of case study analysis indicated that high degrees of pitting corrosion occurred on straight pipes with inner diameter < 50 mm. The results of corrosion tests showed that the residual chlorine concentration around the pitting corrosion of stainless steel type 304 was greater than 0.3 mg/L in the plate, regardless of the remaining chlorine concentration in the straight pipe specimens. These results suggest that straight pipes have higher corrosion susceptibility because of bending during production.
The Influence of Different Contents of Bi Addition on the Corrosion Behavior of Various Zirconium-Based Alloys  [PDF]
Meiyi Yao, Xiaotong Wu, Wenrong Duan, Weipeng Zhang, Li Zhu, Linghong Zou, Jinlong Zhang, Qiang Li, Bangxin Zhou
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.74044
Abstract:

Zr-4(Zr-1.5Sn-0.2Fe-0.1Cr,wt%), S5(Zr-0.8Sn-0.34Nb-0.39Fe-0.1Cr), T5(Zr-0.7Sn-1.07Nb-0.32Fe-0.08Cr) and Zr-1Nb were adopted to prepare Bi-containing zirconium alloys for systematically investigating the effect of Bi addition on the corrosion resistance of zirconium alloys. The specimens were corroded in superheated steam at 400/10.3 MPa, and in lithiated water with 0.01 M LiOH or in deionized water at 360/18.6 MPa by autoclave testing. Results show that the corrosion resistance increases with the increasing of Bi content dissolved in α-Zr. But the presence of Bi-con- taining second phase particles (SPPs) is unfavorable for the enhancement of corrosion resistance. This indicates that the Bi dissolved in α-Zr matrix plays an important role in improving the corrosion resistance, while the precipitation of the Bi-containing SPPs does harm to the corrosion resistance.

Corrosion resistance of composite materials Fe73.5Cu1Nb3Si13.5B9 – PE type in acid environment
B. Zi?bowicz,L.A. Dobrzański,M. Drak,A. Wydrzyńska
Archives of Materials Science and Engineering , 2008,
Abstract: Purpose: The purpose of the paper is to present corrosion resistance of composite materials Fe73.5Cu1Nb3Si13.5B9– PEHD type in acid environment.Design/methodology/approach: Composite materials Fe73.5Cu1Nb3Si13.5B9 – PEHD type were manufacturedby one-sided uniaxal pressing. Composite materials were placed in a corrosive environment and two tests werecarried out as specified below: test at the temperature of 25oC, solution of 0.1 M chloride acid HCl, time of 348h,test at the temperature of 25oC, solution of 0.1 M sulfuric (VI) acid H2SO4, time of 348h.Findings: The main purpose of obtaining this kind of composite materials is broadening possibilities ofnanocrystalline magnetic materials application that influence on the miniaturization, simplification and loweringthe costs of devices.Practical implications: The manufacturing of composite materials Fe73.5Cu1Nb3Si13.5B9 – PEHD type greatlyexpand the applicable possibilities of nanocrystalline powders of magnetically soft materials however furtherexamination to obtain improved properties of magnetic composite materials and investigations of constructions ofnew machines and devices with these materials elements are still needed.Originality/value: Results allow to complete data concerning composite materials nanocrystalline powder– polymer type which are an attractive alternative for traditional materials with specific magnetic properties.
Influence of heat treatment on corrosion resistance of PM composite materials
A. W?odarczyk-Fligier,L.A. Dobrzański,M. Adamiak
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: of the project was evaluation of the effect of heat treatment and of the reinforcing Al2O3, Ti(C,N) and BN particles in the EN AW-AlCu4Mg1(A) aluminium alloy on the corrosion resistance in the NaCl water solution environment.Design/methodology/approach: some of the composite materials were hyperquenched for 0.5 h at the temperature of 495oC with the subsequent cooling in water, and were quench aged next for 6 h at 200°C. Corrosion tests were made in 5% water NaCl solution.Findings: Besides visible improvement of heat treatment on the corrosion resistance of composite materials in 3% NaCl solution.Practical implications: Tested composite materials can be applicate among the others in automotive industry but it requires additional researches.Originality/value: It was demonstrated that the corrosion resistance of the sintered composite materials with the EN AW-Al Cu4Mg1(A) alloy matrix may be formed by the dispersion hardening with the Al2O3, Ti(C,N) and BN particles in various portions and by the precipitation hardening of the matrix.
Microstructure, Corrosion, and Fatigue Properties of Alumina-Titania Nanostructured Coatings  [PDF]
Ahmed Ibrahim, Abdel Salam Hamdy
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2011, DOI: 10.4236/jsemat.2011.13015
Abstract: Air Plasma spray process was used to deposit a conventional and nanostructured Al2O3-13 wt% TiO2 coatings on a stainless steel substrates. Morphology of the powder particles, microstructure and phase composition of the coatings were characterized by XRD and SEM. Potentiodynamic polarization tests and Electrochemical Impedance Spectro- scopy (EIS) were used to analyze the corrosion of the coated substrate in 3.5% NaCl solutions to determine the opti-mum conditions for corrosion protection. The fatigue strength and hardness of the coatings were investigated. The experimental data indicated that the nanostructured coated samples exhibited higher hardness and fatigue strength compared to the conventional coated samples. On the other hand, the conventional coatings showed a better localized corrosion resistance than the nanostructured coatings.
The Effect of Tightening on the Corrosion Properties of the PVD Layers on Magnesium AZ91D Alloy  [PDF]
Janusz Kaminski, Micha? Tacikowski, Agnieszka Brojanowska, Beata Kucharska, Tadeusz Wierzchon
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2014, DOI: 10.4236/jsemat.2014.45031
Abstract:

The corrosive properties of PVD TiN-Ti-Al type composite titanium nitride layer with titanium and aluminium sub-layers system on the AZ91D magnesium alloy and its sub-layers were investigated by using polarization method and impedance spectroscopy, specifically, in terms of the hydrothermal tightening effect. The aim was to explain the mechanisms which contribute to high anticorrosive properties obtained by hydrothermal tightening. It was stated that the hydrothermal treatment changes the surface topography of the examined layers, most probably due to the formation of a continuous titanium oxides film. Tightening significantly modifies the corrosion resistance of the particular component sub-layers of the TiN-Ti-Al layer which exhibits optimum electrochemical parameters. It was shown that the increase of the electrochemical parameters is controlled by tightening of the outside titanium nitride layer, whereas the aluminium sub-layer plays a critical role in creating proper conditions for the hydrothermal tightening of titanium nitride.

Corrosion Behaviour of TiC-Reinforced Hadfield Manganese Austenitic Steel Matrix In-Situ Composites  [PDF]
Ashok Kumar , Srivastava, Karabi Das
Open Journal of Metal (OJMetal) , 2015, DOI: 10.4236/ojmetal.2015.52002
Abstract: The corrosion behaviour of Hadfield manganese austenitic steel matrix composite reinforced with the varying amount of TiC and unreinforced Hadfield manganese austenitic steel matrix alloy has been evaluated in 3.5% NaCl aqueous solution with the pH value of 6 by the potentiodynamic polarization curves and linear polarization resistance measurements at a scan rate of 1 mV/s at room temperature (25°C ± 2°C). The corrosion rate of the composites is higher than that of their unreinforced matrix alloy and it increases with the increasing volume fraction of TiC. The poor corrosion resistance of the composites can be attributed to the galvanic effects between the matrix and reinforcement.
Analysis of Super Duplex Stainless Steel Properties as an Austenite-Ferrite Composite  [PDF]
Fady M. Elsabbagh, Ahmed El-Sabbagh, Rawia M. Hamouda, Mohamed A. Taha
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.612111
Abstract: Super duplex stainless steel (SDSS) is considered as a composite formed from a microstructure of an approximately equal mixture of two primary constituents (γ-austenite and α-ferrite phases) and the secondary precipitates (sigma, chi, alpha-prime, etc.). While the formation of these phases affects the properties of SDSS, however there are no rules that govern the relationship. In this work, the relationship between toughness as well as corrosion behavior of SDSS (UNS 32760) and the microstructure constituents has been experimentally investigated, and analyzed in view of the composite principles. Another two stainless steels namely; fully austenitic SASS (UNS N08367) and fully ferritic FSS (UNS S42900) are considered to simulate the constituent’s primary components in the composite which are austenite γ and ferrite α phases respectively. Samples of the composite and constituent’s steels are first subjected to solution annealing, where the composite steel has a microstructure of γ austenite and α ferrite grains. They were then subjected to similar different isothermal heat treatment cycles, for the formation of secondary phase precipitations within the transformation temperature ranges of each of γ and α primary grains. Impact toughness and corrosion (specific weight loss) tests were conducted on the annealed and isothermally treated samples. The composite rule of the mixtures (ROM) is used to analyze the relationship between the toughness and corrosion properties in the composite SDSS and the SASS and FSS constituent’s steels. The analysis indicates that in case of toughness, ROM applies well on the composite and constituents’ steels in the solution annealed and in isothermal treatment conditions, where better matching between experimental and calculated results is observed. When applying ROM for corrosion weight loss, a great difference is found between the experimental and calculated results, which is much reduced for solution treated samples ferritic and austenitic temperature ranges of 480℃ - 500℃ and 700℃ - 750℃ as for ferrite and austenite respectively.
A Study of the Replacement of Materials in Smart Card  [PDF]
Md. Khalilur Rahma, Rapha?l Marchand, Budrun Neher
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.69079
Abstract: Gold, nickel and copper are usually used in connector of the smart card. Since Au is expensive and Ni is an allergenic material, simulated (CES) and bibliographical work is carried out in order to replace the Au and Ni layer in smart card connectors without sacrificing reliability. During the work, mechanical and electrical properties, corrosion resistance, cost, toxicity and process compatibility of the samples have been taken into consideration. Cu alloying with Zn or Sn, Cr and stainless steel were selected for electrodeposition process. Secondly, carbides (WC, TiC, ZrC), Ti, TiN, borides (TiB2) and silicide (MoSi2) are considered as a vapour deposited materials and some Cu alloying with Al, N or Mg also considered via ion implantation processes. But, vapour deposition and implantation are high energy processes compared to the electrodeposition process, which is expensive. Therefore, electrodeposited materials such as, Cu alloys (Brass or bronze), Cr and stainless steel could be considered as promising candidate to replace the Au and Ni layer in smart card connectors.
Effect of Laser Cladding Al Ni TiC Powder on Microstructure and Properties of Aluminum Alloy  [PDF]
Xiaolin Zhang, Kemin Zhang, Jinxin Ma, Yu Wang
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2017, DOI: 10.4236/jmmce.2017.51003
Abstract: In this paper, Al/Ni/TiC powders were mixed on the surface of A380 aluminum alloy, by selecting appropriate laser parameters; the cladding layer with good adhesion to the substrate was obtained. The microstructure and properties of the cladding layer under different laser parameters were analyzed. The results show that: the phase composition of the cladding layer is mainly composed of TiC, Al, Ni, C and Ti phases. The hardness of the cladding region is up to 173.3 HV, which is about 2.9 times the matrix (59.1 HV). The corrosion voltage (1.8 V) of the cladding layer shifted significantly from the corrosion potential (1.18 V), the corrosion current density increased, the resistance value decreased and the diameter of the capacitor arc decreased; all these phenomena indicate that the corrosion resistance of the cladding layer is decreased.
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