Corrosion Nature in [CoN/AlN]n Multilayers Obtained from Laser Ablation

Julio Caicedo,Neufer Bonilla,Willian Aperador

doi:10.3390/met11122049

Julio Caicedo, Neufer Bonilla + Show 1 more

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https://doi.org/10.3390/met11122049

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Abstract

The aim of this work is the improvement of the electrochemical behavior of industrial steel using [CoN/AlN]n multilayered system via reactive Pulsed Laser Deposition (PLD) technique with a Nd: YAG laser (λ = 1064 nm) on Silicon (100) and AISI 302 steel substrates. In this work was varied systematically the bilayer period (Λ) and the coatings were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and the chemical composition was determined by means of X-ray photoelectron spectroscopy (XPS). The maximum corrosion resistance for the coating with (Λ) equal to 34.7 nm, corresponding to n = 30 bilayered. The polarization resistance and corrosion rate were around 7.62 × 105 kOhm × cm2 and 7.25 × 10−5 mm/year, these values were 6.3 × 105 and 78.6 times better than those showed by the uncoated 302 stainless steel substrate (1.2 kOhm × cm2 and 0.0057 mm/year), respectively. The improvement of the electrochemical behavior of the steel 302 coated with this [CoN/AlN]n can be attributed to the presence of several interfaces that act as obstacles for the inward and outward diffusions of Cl− ions, generating an increment in the corrosion resistance. The electrochemical results found in the [CoN/AlN]n open a possibility of future applications in mechanical devices that require high demands in service conditions.

Highlights

Many works have focused on the surface protection of mechanical devices manufactured in metals, which due to the operating and service conditions suffer some type of deterioration due to corrosion effect
In the case of CoN material, the processes that govern the incorporation of nitrogen in the films during atomic layer deposition (ALD) of cobalt and cobalt nitride system prepared from cobaltocene (CoCp2) and NH3 plasma are a rather complex
The stoichiometry can be adjusted by varying the nitrogen pressure, it being feasible to produce the nominal stoichiometries of Co2N, CoN and Co2N3

Summary

Introduction

Many works have focused on the surface protection of mechanical devices manufactured in metals, which due to the operating and service conditions suffer some type of deterioration due to corrosion effect In this sense, various processes to improve and coat the steels surfaces have been developed and applied successfully. New manufacturing processes have been developed with the interest of overcoming some technological limitations today these technologies have become indispensable in most of the industrial sector, among which is the pulsed laser deposition technique (PLD) This technique makes it possible to reproduce almost any type of material with high stoichiometric reproducibility and versatility, at a significantly lower cost than current commercial equipment [4,5,6]. PLD can be a very valuable method for depositing cobalt nitrides [3,7,8]

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