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1
Content available Microstructure and Corrosion Behaviour of Co-Mo/TiO2 Nano-Composite Coatings Formed on Disk and Wire Electrodes by Electrodeposition
Krawiec H., Vignal V., Latkiewicz M.
Archives of Metallurgy and Materials
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2019
|
Vol. 64, iss. 1
23--28
EN
The influence of the electrode geometry on the microstructure and corrosion behaviour of Co-Mo nano-crystalline coatings elaborated by electrodeposition is studied. The corrosion behaviour was determined in the Ringer’s solution at 25°C. Electrodeposition mechanisms are also discussed as a function of the electrode geometry. The electrode geometry was found to affect the growth rate and, under certain conditions, the microstructure (existence of channels and pores). It does not have influence on the corrosion behaviour.
2
Content available Influence of Dissolved Oxygen on the Corrosion Behaviour in Ringer's Solution and Artificial Saliva of Co-Mo Nano-Crystalline Coatings Electrodeposited on Co and 316L Substrates
Vignal V., Krawiec H., Latkiewicz M.
Archives of Metallurgy and Materials
|
2019
|
Vol. 64, iss. 1
39--43
EN
The influence on the corrosion behaviour of Co-Mo nano-crystalline coatings of dissolved oxygen is studied in the Ringer’s solution and artificial saliva at 25°C. This was done by means of potentiodynamic tests and surface observations. It was shown that dissolved oxygen has no influence on passivity, oxidation of the coating and selective dissolution of cobalt. By contrast, dissolved oxygen affects corrosion. General corrosion was observed in the Ringer’s solution whereas pitting corrosion was found in artificial saliva.
3
Content available remote Structural investigation and wear resistance of CrAlSiN+DLC coating obtained by hybrid PVD/PACVD process
Lukaszkowicz K.
Archives of Materials Science and Engineering
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2013
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Vol. 62, nr 2
87--92
EN
Purpose: The main aim of the this research was the investigation of the microstructure and the mechanical properties of the CrAlSiN+DLC coating deposited by hybrid PVD/PACVD process onto the X40CrMoV5-1 hot work tool steel substrate. Design/methodology/approach: The microstructure of the investigated coating was observed on the scanning electron microscopy and high resolution transmission electron microscopy. Tests of the coatings’ adhesion to the substrate material were made using the scratch test. A friction coefficient and the wear of coatings were determined in a test according to the ball-on-disk method. Findings: It was found that the microstructure of the nanocrystalline CrAlSiN layer consisted of fine crystallites, while their average size fitted within the range of 5-10 nm. The low-friction DLC show an amorphous character. The coating demonstrated a good adhesion to the substrate. The values of the critical load LC1 and LC2 of investigation coating account for, respectively, 36 and 76 N. In sliding dry friction conditions, after the break-in time, the friction coefficient for the investigated elements is set in the range between 0.03-0.05. The investigated coatings reveals high wear resistance. Practical implications: Economically efficient process improvement, increased production efficiency and quality and products reliability through increased durability and unfailing operation time of tools for plastic formation of non-ferrous metals and improved usable properties shall guarantee measurable economic effects to the manufacturers and users of the products. Moreover, it will enhance their competitiveness both on the domestic and overseas markets. Originality/value: The Author’s original approach was the development of a double-layer coating within one process. Such coating consists of the internal hard PVD layer providing the appropriate hardness, strength, low thermal conductivity and restricting the impact of external factors on the wear process and the external low-friction layer providing good tribological properties.
4
Struktura i właściwości nanokrystalicznych warstw kompozytowych wytwarzanych metodą katodowego odparowania łukowego
Lukaszkowicz K.
Elektronika : konstrukcje, technologie, zastosowania
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2011
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Vol. 52, nr 11
31-33
PL
W pracy przedstawiono wyniki badań struktury, własności mechanicznych oraz odporności korozyjnej nanokrystalicznych i nanokompozytowych powłok naniesionych w procesie PVD na podłoże ze stali narzędziowej do pracy na gorąco X40CrMoV5-1. Badania wykonano na powłokach TiAI- SiN, CrAlSiN oraz AlTiCrN. Stwierdzono, że struktura powłok złożona jest z drobnych krystalitów, a ich średnia wielkość wynosi 9 ... 25 nm w zależności od rodzaju powłoki. Badane powłoki wykazują strukturę kolumnową, jak również dobrą przyczepność do podłoża, wysoką twardość (>4000 HV) oraz odporność korozyjną.
EN
This paper presents the research results on the structure, mechanical properties and corrosion resistance of nanocrystalline and nanocomposite coatings deposited by PVD process on the X40CrMoV5-1 hot work tool steel substrates. The tests were carried out on TiAlSiN, CrAlSiN and AlTiCrN coatings. It was found that the structure of the PVD coatings consisted of line crystallites, while their average size fitted within the ranga of 9 ... 25 nm, depending on the coating type. The coatings demonstrated columnar structure as well as good adhesion to the substrate, a high hardness (>4000 HV) and corrosion resistance.
5
Content available Niszczenie kawitacyjne nanokrystalicznej powłoki TiN wytworzonej na stali austenitycznej 1H18N9T
Krella A., Czyżniewski A.
Problemy Eksploatacji
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2006
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nr 1
63-70
PL
W pracy przedstawiono wyniki badań kawitacyjnych powłoki TiN wytworzonej na stali austenitycznej 1H18N9T metodą katodowego odparowania łukowego (ARC). Ocenę odporności kawitacyjnej powłoki TiN przeprowadzano w oparciu o badania na stanowisku przepływowym ze szczelinowym wzbudnikiem kawitacji. Stwierdzono, że okres inkubacji uszkodzeń powłoki TiN jest o ok. 100% dłuższy niż w przypadku nie pokrytej stali 1H18N9T. Analiza z wykorzystaniem mikroskopii skaningowej wskazuje, że proces niszczenia powłoki TiN następuje głównie w wyniku jej delaminacji.
EN
Results of investigation on cavitation erosion resistance of TiN coating deposited on stainless steel 1H18N9T by means of the cathodic arc method are presented. The evaluation of TiN coating resistance to cavitation erosion is based on the investigation performed in a cavitation tunnel with a slot cavitator and tap water as a medium. It has been confirmed that the incubation period of the TiN coating damage is approximately 100% longer than that of the uncoated steel. The scanning microscope analysis indicates that the damage of TiN coating is due mainly to its delamination.
6
Content available remote Nanokrystaliczne powłoki wielowarstwowe uzyskiwane metodą osadzania laserem impulsowym
Major B.
Problemy Eksploatacji
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2004
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nr 3
23-32
PL
Perspektywę rozwoju powłok nowej generacji stanowią nanokrystaliczne gradientowe materiały funkcjonalne. Metoda osadzania laserem impulsowym oparta jest o ablację i pozwala uzyskiwać jednorodne powłoki wielowarstwowe o budowie nanokrystalicznej praktycznie z dowolnego materiału. W pracy przedstawiono wybrane wyniki badań powłok biozgodnych na bazie TiN oraz hydroksyapatytu, a także wielowarstwowych powłok tribologicznych typu TiN/Ti i CrN/Cr. Analizę strukturalną prowadzono metodami AFM, SEM, TEM oraz XRD. Przedmiotem badań była morfologia powierzchni oraz mikrostruktura przekroju poprzecznego, tekstura krystalograficzna i wielkość naprężeń własnych.
EN
Nanocrystalline functionally gradient materials seem to be perspective in generation of new coatings. Pulsed laser deposition (PLD) allows fabricating homogenous nanocrystalline multilayer coatings from a wide spectrum of materials. Experimental examination results of TiN and hydroxyapatyte bio-compatibile coatings as well as tribological multilayers of TiN/Ti and CrN/Cr type are presented. Surface morphology and cross-section microstructure was studied by application of AFM, SEM and TEM. XRD was used to measure crystallographic texture and residual stress developed in the deposited coatings.
7
Nanocrystalline nickel coatings obtained by the electroplating method.
Kowalewska M., Trzaska M.
Archives of Materials Science
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2004
|
Vol. 25, nr 4
553-560
EN
In this study we were concerned with the reductions of grain size in nickel coatings obtained by addition of D1 organic substances into a multi-component electrolyte containing nickel sulfate, nickel chloride and boric acid. The coatings were obtained by the direct current (DC) electrodeposition process with different current densities of 1, 3 and 6 A/cubic dm. Influence of the DC densities on the structure, topography and morphology of nanocrystalline nickel coatings obtained by the electroplating method were investigated. The coatings were subjected to X-ray diffraction and their grain sizes have been determined by applying the Scherrer formula. To verify the accuracy of the grain size measurements, the nickel coatings were examined by a transmission electron microscope (TEM). The microstructures of the costings were examined by a scanning electron microscope (SEM) and an atomic force microscope (AFM). The performed investigations have confirmed that addition of an organic substance D1 into the electrolytic bath appears to be a suitable way of creating strong nanostructures of nickel deposits.
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