Structural defects and the electrochemical properties of nitride coatings

Назаренко, П. В.; Molyar, A. G.; Polishchuk, I. E.; Yachinskaya, O. G.; Ilin, Alexander

doi:10.1007/bf00729879

Cited by 10 publications

(2 citation statements)

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“…Taking into account the erosion analysis without corrosive effect and the corrosion analysis without erosive effect, it is possible to observe that corrosive failure of nitride coatings (single layer or multilayers) under the action of a corrosive medium occurs at structural defects (pin holes, pores, micro-cracks, etc.). Therefore, the corrosion resistance of multilayer nitride coatings (TiN/TiAlN) is higher than that of single-layer coatings, which may be explained by their greater interface number and features of their microstructure, including the absence of circular crystals characteristic of single-layer coatings [46].…”

Section: Corrosion Analysis Without Erosive Effectmentioning

confidence: 99%

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

et al. 2012

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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.

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Section: Corrosion Analysis Without Erosive Effectmentioning

confidence: 99%

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

et al. 2012

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“…), therefore, the corrosion resistance of multilayer nitride coatings (CrN/AlN) is higher than that of steel and stainless steel, which may be explained by their greater interface number and features of their microstructure, including the absence of circular crystals characteristic of single-layer coatings [20]. In this regard, in this work was observed that the corrosion potentials for steel AISI 304 and steel coated with CrN/AlN under two impact angles (30° and 90°) are more electropositive compared to the uncoated steel AISI D3, thus confirming the protective effects of the coatings [19].…”

Section: Corrosion Analysis Without Erosive Effectmentioning

confidence: 99%

A Comparative Study of Corrosive-Erosive Effects at AISI D3 Steel, 304 Stainless Steel and CrN/AlN Material

Caicedo¹,

Cabrera²,

Caicedo³

et al. 2012

TOMSJ

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Abstract:Corrosive-erosive effect on AISI D3 steel, 304 stainless steel and CrN/AlN coating in aqueous NaCl slurries was studied. CrN/AlN multilayer films with a thickness of 3 m and bilayer period of = 60 nm (50 bilayers) were obtained by using the physical vapor deposition (PVD) technique (magnetron sputtering). The corrosion-erosion experiments were performed in a test machine in which the impingement velocity, impact angle, concentration of solids and pH of the solution were controlled. Polarization curves were simultaneously obtained to correlate the electrochemical effects to the erosive wear mechanisms. The slurry used consists of silica particles suspended in a mixture of acid solution and 3.5% NaCl, with a pH value of 5.6. Electrochemical results showed the best corrosion resistance for 304 stainless steels. Additionally, the surface analysis by SEM micrograph revealed formation of cracks in CrN/AlN multilayers coating and plastic deformation in both steel substrates (AISI D3 steel, 304 stainless steel), especially when the mean impact angle is a critical value of 90°. Measurements of critical and passive current densities showed that the behavior of coated materials differed depending on the substrate that is used. Nonetheless, in a general way, by increasing the impact angle and by changing its incidence from normal to grazing, it led to a resistance to corrosion-erosion processes.

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Improvement of the Electrochemical Behavior of Steel Surfaces Using a [Ti-Al/Ti-Al-N] n Multilayer System

Ipaz

Aperador

Caicedo

et al. 2012

J. of Materi Eng and Perform

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Structural defects and the electrochemical properties of nitride coatings

Cited by 10 publications

References 1 publication

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

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

A Comparative Study of Corrosive-Erosive Effects at AISI D3 Steel, 304 Stainless Steel and CrN/AlN Material

Improvement of the Electrochemical Behavior of Steel Surfaces Using a [Ti-Al/Ti-Al-N] n Multilayer System

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