FRCU - Grupos de Investigación
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Item Wear and corrosion behaviour of AISI 420 stainless steel coated with AlCrN(2024-09-24) Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Izquierdo Pérez, Javier; Souto Suárez, Ricardo ManuelMartensitic Stainless steels are high strength materials used in many industrial applications where a god resistance to wear and corrosion is required, such as blades, shears and cutting tools, valves in the oil and gas, automotive and aerospace components, surgical instruments, among others. To increase even more wear resistance AISI 420 coated by PVD AlCrN is studied in severe wear conditions, simulated in lab as pin on disk with a high hertzian pressure and abrasive tests in ASTM G65. Corrosion was studied in a chloride solution by polarization and impedance tests. The coating was analyzed also in adhesion and hardness using Rockwell C indentation test and nanoindentation. In all tests the performance was compared with an ion nitrided material, another kind of plasma process, in this case a diffusion process, suitable for large components. The coating reached almost 3 microns width and the nitrided case, 10 microns. The substrate hardness was around 5 GPa, the nitrided case reached 18 GPa and the coating 45 GPa. In the pin on disk test against alumina, 10 N load and 500 m, the coefficient of friction was 0.6 in the coated sample, 0.8 in the nitrided sample and the untreated material, but in the mass loss, the difference was much bigger. One order of magnitude less between each other. In the abrasive test with 130 N load, the nitrided sample failed and only the coating passed the test with almost no damage, and mass loss undetectable. The coatings exhibited different corrosion behaviours. Nitriding led to a higher polarization resistance, smaller passivity current and more positive pitting potential that bare steel, evidencing enhanced passivation [1]. But the AlCrN coating showed more active corrosion potential and two orders of magnitude higher currents in the anodic range due to pinholes that prevent sealing the metal. Abrasive testing did not modify the corrosion characteristics of the coated material.Item Tribological behaviour of TiAlN and AlCrN coatings deposited over martensitic stainless steel(2023-04-26) Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Maskavizan, Ana JustinaIn this work, the tribological behaviour of PVD TiAlN and AlCrN coatings deposited on AISI martensitic stainless steel is studied. The coatings were deposited by cathodic arc PVD in Oerlikon Balzers Argentina.Item Wear resistance of an Hyperlox Gold® coating over nitrided martensitic AISI 420 stainless steel(2022-09-15) Dalibón Bähler, Eugenia Laura; Schierloh, Gonzalo José; Tuckart, Walter Roberto; Brühl, Sonia PatriciaMartensitic stainless AISI 420 steel was plasma nitrided and then coated with an Hyperlox Gold® coating (Cemecon), using the PVD magnetron sputtering technique in an industrial facility at Coating.Tech, Argentina. The coating is mainly AlTiN, covered with a thin layer of TiN to provide the gold colour. Duplex samples (nitrided + coated) were tested in wear comparing with only coated AISI 420 steel and with only nitrided steel. XRD, Nanoindentation, Raman, optical, electronic and confocal microscopy were used to observe the cross section and analyse the wear scars. Adhesion was studied in a Scratch Test following ASTM C1624 standard. Abrasive wear tests were conducted in a sand rubber wheel test (ASTM G65) and adhesive wear tests, in a rotational pin on disk machine using a 6 mm alumina ball as counterpart, and 500 m wear distance using three different normal loads. Steel samples were heat treated to acquire the martensitic structure and 580 HV hardness previous to the plasma nitriding process which was carried out in an industrial facility at IONAR, Argentina in a DC pulsed 10 h process at 390ºC with 20% N2-H2 atmosphere. The nitrided layer was 10 um thick, and the hardness was measured as 1180 ± 40 HV. The Hyperlox coating was about 3 um thick and the TiN top coating 0.5 um thick. Adhesion was good in all cases, but it was better in the duplex sample where 90 N was the critical load, meanwhile in the only coated sample, it was 60 N. In the abrasive wear test, both coated samples showed indetectable wear volume loss in a severe wear test with 130 N load. However, in the adhesive wear test carried out with a pin on disk results were unexpected. With a low load (5 N), the nitrided samples had a better behaviour than the coated samples. At higher loads, 7 N and 10 N, the behaviour was inverse. Moreover, the duplex coated samples lost less volume at 10 N, more at 7 N and even more at 5 N. The discussion will show the influence of surface oxidation in the nitrided steel at low loads to diminish the friction coefficient and how the structural stability of the coating system and the trapped debris determines the wear behaviour in the coated samples. The stress distribution with depth is also considered.Item Characterization of thick and soft DLC coatings deposited on plasma nitrided stainless steel(2014-09-15) Brühl, Sonia Patricia; Dalibón Bähler, Eugenia Laura; Heim, Daniel; Forsich, ChristianThick and soft DLC coatings were deposited by PACVD with a DC pulsed discharge on nitrided and non nitrided austenitic stainless steel. The films were characterized by EDS and Raman, hardness was assessed with nanoindenter and the microstructure was analyzed by Optical Microscopy, SEM and XRD.Item Corrosion resistance of DLC hard coatings deposited over nitrided PH stainless steel(2014-07-23) Cabo, Amado; Trava-Airoldi, Vladimir Jesús; Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Pereira, Lânia AuxiliadoraIn this work a DLC film was deposited over ion nitrided PH stainless steel Corrax® with a Si interlayer in a CVD Plasma, where the plasma was generated and sustained by an asymmetric pulsed DC discharge. A nitrided sample was compared in all tests with a DLC coated sample and a duplex one (nitrided+coating). Nitriding has been carried out in an industrial facility with a pulsed DC discharge.Item Comparison of wear and corrosion behavior of three different nitriding methods on AISI 316L stainless steel(2013-07-05) Dalibón Bähler, Eugenia Laura; Vaca, Laura Silvia; Brühl, Sonia Patricia; Simison, Silvia; Escalada, Lisandro; Manova, Darina; Mändl, Stephan; Neumann, HorstIn this work, AISI316L stainless steel was nitrided using three different processes: Low Energy Ion Implantation (LEII), Plasma Immersion Ion Implantation (PI3) and DC Pulsed Plasma Nitriding (DCPPN). The process temperature was chosen between 390 and 430 °C in all processes with the aim of preserving their corrosion resistance.Item Wear resistance of nitrided and DLC coated PH stainless steel(2013-05-27) Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Trava-Airoldi, Vladimir JesúsIn this work PH stainless steel Corrax(R) was ion nitrided and coated with DLC in a CVD process.Item Influence of the silicon interlayer deposition process in the adhesion of the DLC coatings deposited on nitrided martensitic stainless steel(2017-08-25) Dalibón Bähler, Eugenia Laura; Lugo González, Dubrazkha Carolina; Ramírez Ramos, Marco Antonio; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia PatriciaThe DLC coatings are characterized by good wear resistance, low friction coefficient and chemical inertness [1]. However, they have adhesion problems when they are deposited on metallic substrates. For this reason, a thin interlayer of different materials, such as silicon, is deposited previous to the coating in order to improve the adhesion. There are a few studies about the influence of the conditions of the silicon interlayer deposition on adhesion or properties of the coatings [2,3]. In this work, the adhesion of DLC coatings deposited on nitrided and non-nitrided martensitic stainless steel, modifying the silicon interlayer bias potential deposition, is studied.Item Microstructure and wear behavior of TiN coatings deposited on nitrided stainless steel by PBII&D(2017-09-14) Vaca, Laura Silvia; Quintana, Juan Pablo; Vega, Daniel; Moscatelli, Mauro Nicolás; Dalibón Bähler, Eugenia Laura; Brühl, Sonia Patricia; Márquez, Adriana BeatrizThis work presents the wear behavior of TiN coatings obtained by cathodic arc discharge combined with implantation and temperature on AISI 316L stainless steel previously ion nitrided.Item Mechanical and corrosion behaviour of DLC and TiN coatings deposited on martensitic stainless steel(2017-09-10) Dalibón Bähler, Eugenia Laura; Pecina, Jorge Nahuel; Moscatelli, Mauro Nicolás; Ramírez, Marco Antonio; Trava-Airoldi, Vladimir Jesús; Brühl, Sonia PatriciaThe objective of this work is to compare the wear, friction, adhesion and corrosion behaviour of commercial TiN and DLC coatings deposited on AISI 420 stainless steel.