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Tytuł:
Electrochemical impedance spectroscopy as a mean of measuring film thickness of calcium sulfate precipitate on an XC70 carbon steel
Autorzy:
Lanez, T.
Chaabia, N.
Belaid, A.
Powiązania:
https://bibliotekanauki.pl/articles/412077.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
EIS
calcium sulphate
thickness
Opis:
In this paper we present the use of electrochemical impedance spectroscopy measurement as a tool to measure the thickness of calcium sulphate film formed on an XC70 carbon steel. The solution used is a mixture of sodium sulphate and calcium chloride solution at different concentrations. The film thickness of calcium sulphate is estimated, after an immersion time of 4 days. The results indicate reciprocal relationship between measured capacitance and thickness of calcium sulphate film.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 54-61
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innowacyjność regionów w Polsce – stan i uwarunkowania
Innovativeness of the regions in Poland – state and conditions
Autorzy:
Kaliszczak, Lidia
Rabiej, Ewelina
Powiązania:
https://bibliotekanauki.pl/articles/1996397.pdf
Data publikacji:
2021-12-31
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
innowacyjność
metodologia EIS
wskaźniki innowacyjności
regiony Polski
innovation
EIS methodology
innovation indicators
regions of Poland
Opis:
Celem pracy jest ocena zróżnicowania stopnia innowacyjności polskich regionów. Do analizy wykorzystano 21 wskaźników cząstkowych zgrupowanych w czterech obszarach opisujących poziom innowacji w każdym regionie (warunki ramowe, inwestycje, działania innowacyjne, oddziaływanie). Dane pochodziły z European Innovation Scoreboard 2021. W badaniu zastosowano metodę wzorca rozwoju Hellwiga. Na podstawie zmiennej syntetycznej utworzono ranking oraz wyodrębniono grupy typologiczne regionów o podobnym stopniu rozwoju w każdym rozważanym obszarze. Otrzymane wyniki porządkowania i klasyfikowania poszczególnych województw pozwoliły na ukazanie dystansu dzielącego poszczególne regiony od siebie pod względem badanego zjawiska, a także umożliwiły na jakościowe i ilościowe ujęcie występujących dysproporcji. Najbardziej innowacyjnym regionem w Polsce jest wydzielony statystycznie region stołeczny warszawski. Jednocześnie wyraźnie widać duży dystans pozostałej części województwa mazowieckiego i konieczność dalszej koncentracji środków z Unii Europejskiej stymulujących jego rozwój. Do liderów innowacyjności, oprócz regionu warszawskiego, należy zaliczyć województwa: małopolskie, pomorskie oraz dolnośląskie. Stosunkowo wysoką pozycję zajmuje region podkarpacki – w obszarze inwestycji, działań innowacyjnych oraz wpływu (na zatrudnienie, sprzedaż innowacyjnych produktów i zrównoważony rozwój) sytuując się w grupie II. Natomiast jego słabością są warunki ramowe (kapitał ludzki, atrakcyjne systemy badawcze i cyfryzacja). Najniższy poziom innowacyjności odnotowały natomiast wspomniany region mazowiecki (poza Warszawą), świętokrzyski, zachodniopomorski oraz warmińsko-mazurski. Każdy region wyróżnia określona specyfika, stąd uzyskane wyniki mogą stanowić ważne informacje dla samorządów do przyjęcia kierunków działań dynamizujących proces budowania regionalnych systemów innowacji.
The aim of the study was to assess the diversification of the degree of innovation in the Polish regions. For the analysis 21 partial indicators were used, these were grouped into four areas describing the level of innovation in each region (framework conditions, investments, innovative activities, influence). The data was taken from the European Innovation Scoreboard 2021. Hellwig’s development pattern method was used in the research. A ranking was created based on the synthetic variable, and typological groups of regions were extracted with a similar development level in each of the assessed areas. The results obtained from organizing and classifying individual voivodeships showed the distance between individual voivodeships with regard to the examined criteria, and allowed for the creation of a qualitative and quantitative description of the existing disproportions. The most innovative region in Poland is the statistically separate Warsaw capital district. At the same time, the difference between the rest of the Mazowiecki region and its capital is clearly visible, as well as the necessity to further concentrate European Union resources there in order to stimulate the development of the region. Among the leaders of innovation, apart from the Warsaw district, are the Małopolski, Pomorski, and Dolnośląski regions. The Podkarpacki region holds a relatively high position in the areas of investment, innovative activities and influence (concerning employment, selling innovative products and sustainable development), and is situated to the second (II) group. On the other hand its weakness include its framework conditions (human capital, attractive research systems and digitalization). The lowest level of innovation was recorded in the aforementioned Mazowieckie region (excluding Warsaw), and in the Świętokrzyski, Zachodniopomorski, and Warmiński-mazurski regions. Each voivodeship is distinguished by its specificity, hence the obtained results may constitute important indicators for local governments to adopt courses of action to stimulate the process of building regional innovation systems.
Źródło:
Nierówności Społeczne a Wzrost Gospodarczy; 2021, 68; 114-131
1898-5084
2658-0780
Pojawia się w:
Nierówności Społeczne a Wzrost Gospodarczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Crushed Rock Spoil on Pitting Corrosion of Selected Stainless Steels
Autorzy:
Krakowiak, S.
Kierepa, S.
Powiązania:
https://bibliotekanauki.pl/articles/355996.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion
erosion
pitting corrosion
EIS
Opis:
The paper presents the results of the pitting resistance investigations of selected stainless steels in the chloride environment and the simultaneous impact of erosive factors using the cyclic polarization technique. Additionally, using electrochemical techniques, ie: electrochemical impedance spectroscopy (EIS) and measurement of corrosion potential, the behavior of the passive layer of selected stainless steels in the environment of chlorides and erosion was examined. On the basis of the obtained results, the resist-ance of stainless steels 1.4301 and 1.4404 was found, both on the effect of chloride ions and erosive factors in the studied systems. Both tested steels are susceptible to pitting corrosion. It was found that a good measure of erosive impact on stainless steel is both impedance spectrum analysis and continuous monitoring of the corrosion potential of steel.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 163-168
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Crushed Rock Spoil on Pitting Corrosion of Selected Stainless Steels
Autorzy:
Krakowiak, S.
Kierepa, S.
Powiązania:
https://bibliotekanauki.pl/articles/356937.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
corrosion
erosion
pitting corrosion
EIS
Opis:
The paper presents the results of the pitting resistance investigations of selected stainless steels in the chloride environment and the simultaneous impact of erosive factors using the cyclic polarization technique. Additionally, using electrochemical techniques, ie: electrochemical impedance spectroscopy (EIS) and measurement of corrosion potential, the behavior of the passive layer of selected stainless steels in the environment of chlorides and erosion was examined. On the basis of the obtained results, the resistance of stainless steels 1.4301 and 1.4404 was found, both on the effect of chloride ions and erosive factors in the studied systems. Both tested steels are susceptible to pitting corrosion. It was found that a good measure of erosive impact on stainless steel is both impedance spectrum analysis and continuous monitoring of the corrosion potential of steel.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1627-1632
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement Data Acquisition System Utilising the GSM Phone System
Autorzy:
Brocki, J
Goetzen, P.
Makuch, J.
Marchlewska, A.
Skowrońska-Kapusta, A.
Powiązania:
https://bibliotekanauki.pl/articles/108728.pdf
Data publikacji:
2010
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
computer networks
data acquisition
GSM
EIS
Opis:
We present a new approach to designing of application which can be used for data acquisition. Cellular phone is used to transfer the data. Connecting many phones builds highly scalable measurement network. SMS messages were used to transfer the data.
Źródło:
Journal of Applied Computer Science Methods; 2010, 2 No. 2; 201-211
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion hampering measurements of AISI 316 SS submerged in alkaline solutions
Pomiary korozji stali AISI 316 w roztworach alkalicznych
Autorzy:
Hryniewicz, T.
Kuszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/158413.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
korozja
stal AISI 316
pomiar EIS
środowisko alkaliczne
chlorki
corrosion
EIS measurements
AISI 316 SS
alkaline environments
chlorides
Opis:
The aim of this study was to investigate the corrosion behaviour of AISI 316 stainless steel to be used as rebars in construction. Austenitic stainless steel AISI 316 samples were put to the alkaline aqueous environments of composition: 0.01M NaOH+0.01M KOH both free of chlorides and those containing 3% NaCl. The hydrogen ion exponent pH was 10 and 12.5. The following electrochemical methods have been used to investigate corrosion: polarization curves PC, Electrochemical Impedance Spectroscopy EIS, and 24-hour open circuit potential OCP studies. The obtained results are quite comprehensive and indicate on faster self-restoration of passive films under action of chlorides. The chlorides do not cause essential changes in the potential values, both corrosion and critical, in comparison with the results on samples studied in the solutions free of chlorides. The studies reveal that, out of two alkaline environments, the AISI 316 SS better performs in the presence of solutions of lower pH. The presence of chlorides in the solution enables faster formation of a passive film and its eventual auto-restoration in case of disruption. The presented investigation results indicate the chlorides accelerate transition of Cr(III) to Cr(VI) on steel surface. The longer steel AISI 316 sample remains in the solution, the more and more film formed on the steel surface strengthens and gets stabilized resulting in better surface protection.
W pracy przedstawiono wyniki badań korozyjnego zachowania się stali kwasoodpornej AISI 316 - przewidywanej do zastosowań konstrukcyjnych w budownictwie - w roztworach alkalicznych. Przygotowane próbki stalowe umieszczono w roztworach o składzie: 0.01M NaOH+0.01M KOH bez chlorków oraz zawierającym 3% NaCl. Wykładnik jonów wodorowych wynosił 10 i 12,5. Do pomiarów korozyjnego zachowania się stali zastosowano badania krzywych polaryzacyjnych PC, elektrochemiczną spektroskopię impedancyjną EIS, oraz badania potencjału obwodu otwartego OCP. Wyniki badań są zgodne i wskazują na szybsze samoodnowienie warstewki pasywnej pod wpływem chlorków. Chlorki nie powodują zasadniczych zmian w wartościach potencjału, i to zarówno korozyjnego jak i krytycznego, w porównaniu z wynikami uzyskanymi w roztworach bez chlorków. Wyniki badań wskazują, że spośród dwu zastosowanych roztworów, stal AISI 316 jest bardziej odporna na korozję w roztworach o niższym pH. Obecność chlorków w roztworze umożliwia szybsze tworzenie się warstewki pasywnej i jej odtwarzanie w przypadku przerwania. Wyniki badań wskazują, że chlorki przyspieszają przejście Cr(III) do Cr(VI) na powierzchni stali. Wydłużenie czasu pozostawania stali w roztworze powoduje umocnienie warstewki i stabilizację ochrony powierzchni stali.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 4, 4; 344-348
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy regions: interpretations of surface area and distance
Autorzy:
Verstraete, J.
Powiązania:
https://bibliotekanauki.pl/articles/970936.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fuzzy topology
fuzzy EIS
fuzzy surface
fuzzy distance
Opis:
This contribution concerns the modelling of fuzzy information in geographic databases. For this purpose, fuzzy regions and fuzzy points have been defined in the past, along with a number of suitable operations. For numerical information - such as the surface area of fuzzy regions, or the distance between fuzzy regions and/or fuzzy points - the computation depends on the interpretation given to the fuzzy regions or points. Consequently, it is important to differentiate between the interpretation in order to obtain correct results. This article explains in detail the impact of the interpretation in terms of both the surface area and the distance.
Źródło:
Control and Cybernetics; 2009, 38, 2; 509-526
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The analysis of finishing tooling influence on corrosion properties researched by EIS
Autorzy:
Labuda, W.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/248058.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
burnishing
surface layers
angular momentum pump
corrosion properties
EIS
Opis:
Angular momentum pumps are very often applied onboard ships. These pumps are used in cooling circuits of medium and high power engines, power plant boilers and in bilge, ballast and fire installations. Very extensive use of angular momentum pumps on board is connected with their numerous advantages. During operation the wear of marine hull, the rotor and shaft seals take place. The research attempts to increase the service life of shafts. The article presents the research results referring to the analysis of the influence of finish treatment (lathing, grinding and burnishing) on the corrosion properties of steel applied to marine pump shafts. The research was performed on a roller of 40 mm in diameter made of X5CrNi18-10 (AISI 304 L) stainless steel. The lathing process was carried out by means of a WNMG WF 080408 Sandvik Coromant cutting tool with replaceable inserts. The grinding process was performed by grinding attachment for lathes. The 1 - 80x10x32 - 99C 80-N V grinding wheel was used for the process. The process of burnishing was done by SRMD burnisher by Yamato. In addition, the influence of the burnisher passes number on the corrosion properties was determined. The paper will present the results of electrochemical impedance spectroscopy research. To conduct the survey the Atlas 0531 EU and IA potentiostat was used. Determination of the corrosion process parameters was performed computer programs: AtlasLab 2.0 and EIS Spectrum Analyzer.
Źródło:
Journal of KONES; 2012, 19, 1; 237-244
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pseudocapacitive Characteristics of Mg Doped ZnO Nanospheres Prepared by Coprecipitation
Autorzy:
Arul, S.
Senthilnathan, T.
Jeevanantham, V.
Satheesh Kumar, K. V.
Powiązania:
https://bibliotekanauki.pl/articles/2049144.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zinc oxide
Mg-doped ZnO
coprecipitation
cyclic voltammetry
EiS
Opis:
A n-type semiconductor ZnO has high transmittance features, excellent chemical stability and electrical properties. It is also commonly used in a range of fields, such as gas sensors, photocatalysts, optoelectronics, and solar photocell. Magnesium-doped zinc oxide (Mg-ZnO) nano powders were effectively produced using a basic chemical precipitation process at 45°C. Calcined Mg-ZnO nano powders have been characterized by FTIR, XrD, SEM-EDX and Pl studies. XRD measurements from Mg-ZnO revealed development of a crystalline structure with an average particle size of 85 nm and SEM analysis confirmed the spherical morphology. Electrochemical property of produced Mg-ZnO nanoparticles was analyzed and the specific capacitance value of 729 F g-1 at 0.5 A g-1 current density was recorded and retained a specific capacitance ~100 percent at 2 A g-1 current density.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1141-1148
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of the Properties of Ti6Al7Nb Titanium Alloy in Terms of the Type of Surface Modification
Autorzy:
Woźniak, A.
Bialas, O.
Adamiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/353294.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloys
sol-gel method
ZrO2 coating
EIS
AFM
Opis:
The paper presents the influence of ZrO2 coating on Ti6Al7Nb titanium alloy depending on the method of deposition. The coatings were made by sol-gel method and atomic layer deposition (ALD). Wettability tests, pitting corrosion assessment and electrochemical impedance spectroscopy (EIS) were carried out in the paper. Complementary macro- and microscopic observations, roughness analysis by profilometric method and atomic force microscopy (AFM) were made. Based on the results obtained, it can be concluded that the type of method of depositing the layer on the surface of the material has a significant influence on its properties and that it should be taken into account during the process of the material improvement. Drawing on the findings presented, it can be inferred that roughness has a significant impact upon the surface wetttability of the tested surfaces and their related corrosion resistance. The obtainment of hydrophobic surfaces is for smaller rougidity values.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 735-741
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EIS research of AW - 7020 alloy joints welded by MIG
Autorzy:
Dudzik, K.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/248097.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electrochemical impedance spectroscopy (EIS)
aluminium alloys
MIG welding
corrosion
Opis:
The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by MIG were presented. In the article the parameters for MIG welding of sheets made of AlZn5Mg1 (7020) alloy was presented. Metallographic analysis of bonds showed a proper structural construction MIG welded 7020 aluminum alloy. EIS measurement was performed in three electrode system in artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range plus or minus 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU and IA potentiostat was used for studies. Model in the form of an electrical equivalent circuit replacement was chosen for the test object. The results of electrochemical impedance spectroscopy are presented graphically in the Nyquist charts matched with the theoretical curve to them and in the form of parameters characterizing the corrosion process. Obtained results were statistically analyzed. Much better resistance to electrochemical corrosion was found for the native material then joint welded by MIG of 7020 aluminum alloy. The most important parameter - charge transfer resistance value of a double layer Rct for sample of native material is higher than for the sample welded by MIG. Original value is received results of the corrosion properties of MIG welded AlZn5Mg1 alloy compared with the native material.
Źródło:
Journal of KONES; 2012, 19, 1; 83-88
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Rapid Cooling on the Corrosion Resistance of As-Cast Aluminium Alloy 5052
Autorzy:
Szklarz, Z.
Krawiec, H.
Rogal, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/106959.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
aluminium alloys
cooling rate
EIS
passive films
pitting corrosion
Opis:
The effect of rapid cooling by the vacuum suction casting method (VSC) on the microstructure and electrochemical response of the as-cast 5052 aluminium alloy is presented. The VSC method allowed us to obtain massive samples with a very high cooling rate (102 – 103)oC/s. The microstructure of the quick-cooled sample (QC) has been significantly changed. Finer grains and more-homogeneous intermetallic phase distribution has been observed. Corrosion potential (OCP) and polarization measurements (LSV) revealed a higher activity of the QC alloy than ingot (IN), which leads to a denser and thicker corrosion-product formation on the surface. Electrochemical Impedance Spectroscopy (EIS) indicates higher resistance values, which suggests a greater thickness of the corrosion products.
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 2; 48-52
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosive properties distribution in AW-7020 alloy joints welded by FSW
Autorzy:
Dudzik, K.
Powiązania:
https://bibliotekanauki.pl/articles/247352.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
electrochemical impedance spectroscopy
EIS
friction stir welding
FSW
welding
corrosion
Opis:
The results of corrosion properties research of aluminum alloy AW 7020 (AlZn5Mg1) welded by Friction Stir Welding were presented. In the article the parameters for friction stir welding of sheets made of AlZn5Mg1 (7020) alloy were presented. Corrosion tests were performed on the surface of the FSW joined sheets depending on the distance from the centre of the weld. EIS measurement was performed in three-electrode system in an artificial seawater (3.5% NaCl). Impedance studies were carried out at the corrosion potential. Changed voltage signal amplitude in the range ± 10 mV and frequency range of changes was as follows: 100 kHz - 0.1 Hz. Atlas 0531 EU & IA potentiostat was used for studies. Model in the form of an electrical equivalent circuit replacement was chosen for the test object. The results of electrochemical impedance spectroscopy are presented graphically in the Nyquist charts matched with the theoretical curve to them and in the form of parameters characterizing the corrosion process. Obtained results were statistically analysed. Better resistance to electrochemical corrosion was found for the native material then joint welded by FSW of 7020 aluminum alloy. Worse corrosion properties were observed in the advancing side of the weld than in the retreating side of the weld. Original value are received results of the corrosion properties distribution of FSW welded AW-7020 aluminium alloy.
Źródło:
Journal of KONES; 2014, 21, 4; 79-85
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Resistance of the Nanostructured X37CrMoV5-1 Steel
Autorzy:
Skołek, E.
Kamiński, J.
Marciniak, S.
Świątnicki, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/356529.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanobainitic steel
quenched and tempered steel
TEM
EIS
polarization
corrosion
Opis:
The aim of this study is to compare the corrosion resistance of X37CrMoV5-l tool steel after nanostructurization and after a conventional heat treatment. The nanostructuring treatment consisted of austempering at 300°C, which produced a microstructure composed of nanometric carbide-free bainite separated by nanometric layers of retained austenite. The retained austenite occurred also in form of blocks which partially undergo martensitic transformation during final cooling. For comparison, a series of steel samples were subjected to a standard quenching and high tempering treatment, which produced a microstructure of tempered martensite. The obtained results showed that the corrosion resistance of steel after both variants of heat treatment is similar. The results indicate that the nanocrystalline structure with high density of intercrystalline boundaries do not deteriorate the corrosion resistance of steel, which depends to a greater extent on its phase composition.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 133-140
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of finishing on the corrosion properties of flame sprayed Ni-5%Al and Ni-5%Al-Al2O3 coatings
Autorzy:
Charchalis, A.
Starosta, R.
Powiązania:
https://bibliotekanauki.pl/articles/247338.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
flame spraying
composite coating
Ni-Al
burnishing
corrosion
potentiodynamic test
EIS test
Opis:
The Ni-5%Al alloy and Ni-5% Al-Al2O3 composite coatings were obtained by a flame spraying method, “Casto- Dyn DS 8000” torch was used. The coatings onto a substrate made of austenitic stainless steel (X5CrNi18-10) were sprayed. The coatings were subjected to turning, burnishing and grinding. The evaluation of corrosion properties were based on the measurements of direct current (potentiodynamic method) and the alternating current (EIS method). Corrosion tests were performed in a 3.5% sodium chloride solution. On the basis of studies, the effect of finishing type on the corrosion properties of flame sprayed coatings has been demonstrated. The lowest corrosion current density was found for Ni-5%Al coatings after burnishing, icorr value equal to 0.76 μA/cm2, and the charge transfer resistance was 31063 Ω/cm2. The lowest resistance to corrosion of grinded Ni-5%Al-Al2O3 composite coatings was observed. These coatings were characterized by the following parameters of corrosion process: icorr = 14.01 μA/cm2, Rct = 3260 Ω/cm2. Burnishing caused increased corrosion resistance of both coatings. Due to reduced roughness and waviness are obtained reduction of the area of the actual burnished coatings compared to turned coatings. Thus, it is resulting in reduced values of corrosion current density. After finishing treatment, the thermally sprayed Ni-5%Al-15%Al2O3 coatings characterized by lower corrosion resistance compared to the alloy coating. The presence of the reinforcing phase in the coating promotes the increase of the porosity. Burnishing does not cause a significant change in porosity of the coating. The flame sprayed coatings on nickel-based have a tendency to localized corrosion in seawater environment.
Źródło:
Journal of KONES; 2014, 21, 4; 29-36
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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