Temat: composite coating - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The quantitative analysis of the effect of the porosity, the volume of fraction of reinforcing phase and the thermal spraying methods, on corrosion properties of composite coatings in marine environment
Autorzy:: Starosta, R.
Powiązania:: https://bibliotekanauki.pl/articles/244816.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: thermal spraying
corrosion property
composite coating
Opis:: In the paper an assessment of the impact of the thermal spray methods, porosity and the volume fraction of reinforcing phase (aluminium oxide) on the corrosion properties (corrosion current density and corrosion potential) of Ni-5%Al alloy coatings and Ni-5%Al-Al2O3 composite coatings reinforced by particle dispersion was presented. The volume fraction of reinforcing phase in the coatings was 15, 30 and 45%. These materials would potentially be used in the shipbuilding industry as regenerative coatings for repair of marine pump shafts. The samples (substrates) were made of carbon C45 (0.45%C) steel. For thermal spray of coatings, two oxy-acetylene (Casto-Dyn DS 8000 and Roto-Tec 80) torches and one plasma gun (PN120) were deployed. The two distances 100 mm and 150 mm from the nozzle onto the substrate were used. In addition, the two substrate temperatures 150°C or 250°C were applied. Corrosion properties of the coatings were tested in a replacement seawater (3.5% NaCl) by polarization curves method. It has been found that among the independent variables considered: a method of thermal spraying, fraction of reinforcing phase and porosity, the last mentioned has the greatest influence on the corrosion properties of thermally sprayed coatings on the matrix of Ni-5% Al. The value of the corrosion potential of coatings depended on the used thermal spray method. It has been found that the more modern method of producing coatings of the higher velocity of the coating material in a sprayed stream has a significant positive effect on the porosity of the coatings. The presence of the reinforcing phase (Al2O3) in composite coatings contributes to a reduction of value of the corrosion current density and increase of the corrosion potential value.
Źródło:: Journal of KONES; 2016, 23, 1; 321-327
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Corrosion of Ni-5 percent Al AND Ni-5 percent Al-Al2O3 flame sprayed coatings of "CastoDyn 8000" torch in 0.01 M H2SO4 and 3.5 percent NaCl solutions
Autorzy:: Starosta, R.
Czoska, P.
Powiązania:: https://bibliotekanauki.pl/articles/246279.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: thermal spray coating
composite coating
corrosion
torque pomp
Opis:: One of methods of regenerating parts of machines is flame thermal spraying, which can be used by ship engine room crew. This method does not require great skill of the operator and is not associated with expensive workstation equipment. Flame sprayed coatings are characterized bv porosity and the presence of oxide inclusions. The presence of pores affects negatively on the corrosion properties of coatings. There is a corrosive environment which may be passed thmugh the pores of the coating to the substrate. This phenomenon is especially dangerous in case of applying cathodic coatings (copper, copper alloys and nickel alloys). The substrate corrosion may then proceed below coating. In the paper researches results of corrosion properties of Ni-Al alloy and Ni-Al-Al2O3 composite coatings were presented. Coatings were obtained by flame spraying of "Casto-Dyn 8000" torch. The studies in 0.01 M H2SO4 and 3.5 NaCl (artificial sea water) environments were realized. Measurements were made following methods: polarization and impedance spectroscopy. Rated coatings are more resistant to the 3.5% NaCl environment than the 0.01 M H2SO4. Corrosion current density for alloy coatings in artificial seawater was 7 miA/cm2 and 232 miA/cm2 environment acidic. Impedance spectroscopy studies showed that the alloy coatings are characterized by more than four times greater resistance in sodium chloride solution than in sulphuric acid solution. Curves flattened in the Nyquist plots may indicate that the appearance of products of corrosion coatings in the pores of the samples during exposure to sea water substitute. The value of corrosion potential in an environment of 3.5% NaCl is about 200 mV lower than 0.01 MH2SO4. Composite coatings Ni-Al-Al2O3 were characterized by a lower corrosion current densities and increased resistance than Ni-Al coatings. This is connected with the operation of non-conducting barrier electrim particles of alumina.
Źródło:: Journal of KONES; 2010, 17, 4; 471-476
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The influence of finishing on the tribological properties of plasma sprayed MMC coatings
Autorzy:: Charchalis, A.
Starosta, R.
Powiązania:: https://bibliotekanauki.pl/articles/242057.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: plasma spraying
composite coating
MMC
friction test
T05 machine test
Opis:: During operation of marine pumps, one of the most common disability is tribological wear of shaft neck cooperating with the gland. In the practice, worn shafts are exchanged for new or are regenerated by chromium plating, padding or thermally sprayed of ceramic coatings, mainly Al2O3 In this article, the use of plasma sprayed Ni-5% Al-15%Al2O3 composite coatings were proposed. The surfaces of coatings by turning and burnishing treatments were shaped. Tribological properties of composite materials are dependent on the proportion and size of the reinforcing phase particles contained in a metal matrix. A reinforcement composite with very small dimensions and the amounts may result in increased wear and increase the coefficient of friction. It is therefore important to check whether the advisable of phase composition will not adversely affect the wear of the composite and the cooperating the part. The presence of a 15% volume fraction of the alumina particles on the selected tribological properties of the Ni-5% Al matrix composite coatings were evaluated. In order to assess the effect of the applied tapes of finishing on wear of MMC coatings, the tribological tests were performed on the "T05" machine with head roll- piece type. It has been found that the burnishing favours a lower wear of composite coating and the cooperating element compared to the coatings after turning treatments. At the same time observed more than ten times less wear intensity of MMC coatings in the initial time of friction, which may indicate a shorter time needed to grind of cooperating elements.
Źródło:: Journal of KONES; 2016, 23, 1; 91-97
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Effect of burnishing on the corrosion properties of Ni-5%Al AND Ni-5%Al-15%Al2O3 coatings obtained by plasma spraying
Autorzy:: Starosta, R.
Powiązania:: https://bibliotekanauki.pl/articles/245849.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: plasma spraying
composite coating
Ni-Al
burnishing
corrosion
polarization test
EIS test
Opis:: The Ni-5%Al alloy coatings and Ni-5% Al-15%Al2O3 composite coatings were obtained by plasma spraying method. The PN120 gun was used. The coatings onto a shaft made of austenitic stainless steel (X5CrNi 18-10) were sprayed. The coatings were subjected to turning, burnishing. The evaluation of corrosion properties were based on the measurements of corrosion current density and corrosion potential (polarization method), the charge transfer resistance and exponent of constant phase element impedance (electrochemical impedance spectroscopy method). Corrosion tests were performed in replacement seawater (3.5% sodium chloride solution). On the basis of studies, the effect of finishing type on the corrosion properties of plasma sprayed coatings has been demonstrated. The lowest corrosion current density was found for Ni-5% Al coatings after burnishing, icorr value equal to 0.96 A/cm2, and the charge transfer resistance was 27007 Ωcm2. The lowest resistance to corrosion of turned Ni-5%Al-15%Al2O3 composite coatings was observed. These coatings were characterized by the following parameters of corrosion process: icorr = 17.64 A/cm2, Rct = 2137 Ωcm2. Burnishing caused increased corrosion resistance of 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 plasma 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. The plasma sprayed coatings on nickel matrix had a tendency to localized corrosion in sodium chloride solution.
Źródło:: Journal of KONES; 2014, 21, 1; 273-280
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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