Nature in corrosion–erosion surface for [TiN/TiAlN]n nanometric multilayers growth on AISI 1045 steel

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 1500 nm, 500 nm, 250 nm, 150 nm and 125 nm 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 (XRD) 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 H 2 SO 4 solution at impact angles of 30º and 90º over surface. The electrochemical characterization was carried out using the 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 359 mpy for uncoated steel substrate and 103 mpy for substrate coated with n = 24 (Λ = 125 nm) under an impact angle of 30º were found. On the other hand, for an impact angle of 90º the corrosion rate exhibited 646 mpy for uncoated steel substrate and 210 mpy for substrate coated with n = 24 (Λ = 125 nm). This behavior was correlated with the curves of mass loss for both coated samples and the surface damage was analyzed via SEM 2 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 corrosiveerosive environments.

Effect of nitrides on the corrosion behaviour of 316L SS bipolar plates for Proton Exchange Membrane Fuel Cell (PEMFC)

“…In recent years, some improvements have been made by the deposition of two or more different layers to reduce the pinholes, microcracks and to mitigate the corrosion in PEMFC environment. The current research reports show that the [TiN/TiAlN] n nanometric layers grown on AISI 1045 steel represent a very good solution for corrosioneerosion environments in an acidic medium [23]. The aim of this work is to develop the mono-layer TiN, TiAlN and bi-layer TiN/TiAlN coatings on 316L SS to enhance the corrosion resistance, improve the electrical conductivity and reduce the surface resistance of the Bp for PEMFC use.…”

Influence of the Number of Bilayers on the Mechanical and Tribological Properties in [TiN/TiCrN]n Multilayer Coatings Deposited by Magnetron Sputtering

“…Authors such as J.C Caicedo et al [13] also showed this behaviour in multilayers systems The roughness is a factor that influenced the tribological properties, influencing the formation of asperities, the type of contact and the wear generated at the beginning of the tribological test [15,14], thus, the coating with 50 bilayers presented a decrease in the formation of asperities, a greater area of contact and less wear at the beginning of the tribological test, as corroborated later in Fig. 9a.…”

“…Consequently, in the current literature it is possible to observe numerous studies on binary coatings such as TiN, presenting very interesting results in properties such as hardness and wear resistance [5], and ternary coatings such as TiCrN which, in addition to presenting important properties such as hardness and wear resistance, has a high resistance to corrosion [3,10,11], by combining the two systems TiN and TiCrN to form a new multilayer system [TiN/ TiCrN]n, a structure with better properties than each separate coating is produced. Multilayer coatings are known to have better mechanical, tribological and electrochemical properties compared to monolayer coatings because these nanometric periods allow a relaxation and dissipation of stresses as well as greater impediments to the movement of cracks, being this a better system for coating cutting tools by extending its service life [12,13].…”

Study on microstructure and high-temperature tribological properties of multi-component nitride hard coatings

“…It is an important method for surface modification of materials. It has been widely used in the fields such as semiconductor, instrument, space, nuclear energy and mechanics [1][2][3] . Using the physical, chemical vapor deposition or other methods to form a kind of refractory metal hard coating (such as CrN, TiN, etc.)…”