Abstract
The aim of this work is to characterize the electrochemical behavior of [TiN/TiAlN]n multilayer coatings under corrosion–erosion condition. The multilayers with bilayer numbers (n) of 2, 6, 12, and 24 and/or bilayer period (Λ) of 1500nm, 500nm, 250nm, 150nm and 125nm were deposited by magnetron sputtering technique on Si (100) and AISI 1045 steel substrates. Both, the TiN and the TiAlN structures for multilayer coatings were evaluated via X-ray diffraction analysis. Mechanical and tribological properties were evaluated via nanoindentation measurements and scratch test respectively. Silica particles were used as abrasive material on corrosion–erosion test in 0.5M of H2SO4 solution at impact angles of 30° and 90° over surface. The electrochemical characterization was carried out using polarization resistance technique (Tafel), in order to observe changes in corrosion rate as a function of the bilayer number (n) or the bilayer period (Λ) and the impact angle. Corrosion rate values of 9115μm y for uncoated steel substrate and 2615μm y for substrate coated with n=24 (Λ=125nm) under an impact angle of 30° were found. On the other hand, for an impact angle of 90° the corrosion rate exhibited 16401μm y for uncoated steel substrate and 5331μm y for substrate coated with n=24 (Λ=125nm). This behavior was correlated with the curves of mass loss for both coated samples and the surface damage was analyzed via scanning electron microscopy images for the two different impact angles. These results indicate that TiN/TiAlN multilayer coatings deposited on AISI 1045 steel represent a practical solution for applications in corrosive–erosive environments.
Highlights
The corrosion-erosion condition is an accelerated corrosion of metals due to a combination of chemical and abrasion attack by physical movement of fluids with suspended solids
Images for the two different impact angles. These results indicate that TiN/titanium aluminum nitride (TiAlN) multilayer coatings deposited on AISI 1045 steel represent a practical solution for applications in corrosiveerosive environments
The aim of this work is to characterize the behavior of [TiN/TiAlN]n multilayer coatings affected by erosion process without corrosive effect, corrosion without erosive effect, and multilayer coatings under corrosive-erosive fluid as function of bilayer number (n) and bilayer period (Λ = tTiN+tTiAlN) with changes in the impact angle in relation to wear particles, comparing with the behavior presented by the AISI 1045 steel uncoated substrate
Summary
The corrosion-erosion condition is an accelerated corrosion of metals due to a combination of chemical and abrasion attack by physical movement of fluids with suspended solids. The aim of this work is to characterize the behavior of [TiN/TiAlN]n multilayer coatings affected by erosion process without corrosive effect, corrosion without erosive effect, and multilayer coatings under corrosive-erosive fluid as function of bilayer number (n) and bilayer period (Λ = tTiN+tTiAlN) with changes in the impact angle in relation to wear particles, comparing with the behavior presented by the AISI 1045 steel uncoated substrate. The mechanical analyses were performed via nanoindentation by using an Ubi1-Hysitron device and a diamond Berkovich tip at variable loads Out of these measurements, load-penetration depth curves of the indentations of the multilayer coatings were obtained. The process of surface corrosion was analyzed and the superficial morphology was characterized by using a High-Resolution Scanning Electron Microscope (SEM) (Philips XL 30 FEG)
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