Study of electrochemical behavior of CrN/Cu nanolayer coatings applied by PVD on SS 304

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Study of electrochemical behavior of CrN/Cu nanolayer coatings applied by PVD on SS 304

ارائه دهنده: Provider: Mozhgan Hirbodjavan

اساتید راهنما: Supervisors: Arash Fattah-alhosseini (Ph.D) Hasan Elmkhah (Ph.D)

اساتید مشاور: Advisory Professors: Omid Imantalab (Ph.D)

اساتید ممتحن یا داور: Examining professors or referees: دکتر حمید اصفهانی دکتر میثم نوری

زمان و تاریخ ارائه: Time and date of presentation: 2021

مکان ارائه: Place of presentation:

چکیده: Abstract: The principal goal of this research is to produce a CrN / Cu multilayer nanostructure coating and a CrN single-layer coating and also compare their electrochemical behavior and antibacterial behavior. In this investigation, the coatings were applied to the stainless steel substrate by physical vapor deposition using a cathode arc (CAE-PVD). The present phases were characterized and the thickness of the coatings was studied using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) patterns, respectively. Rockwell C macrohardness test was used to evaluate the adhesion properties. Also, in order to evaluate the mechanical properties of the coatings such as modulus of elasticity and nanoindentation, nano-indentation test was used and the residual effect of nano-indenting and roughness calculation were evaluated using obtained images from atomic force microscopy (AFM).Studying the electrochemical behavior of the created coatings were done using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) tests in Ringer's solution. Antibacterial activity of CrN and CrN / Cu coatings was specified by spot-inoculation. Microscopic images and the obtained results from Rockwell C hardness test showed that the created coatings are homogeneous and have good adhesion. The results of EIS tests showed that the CrN coating had higher polarization resistance in comparison to the CrN / Cu coating and an increasing trend of polarization resistance related to both coatings was identified by rising the time of immersion. Also, using the potentiodynamic polarization curves, the CrN and CrN / Cu coating current densities were estimated 1.835 × 10 -8 and 2.088 × 10 -8, respectively. The obtained results of the study for the antibacterial behavior of coatings indicated that compared to CrN coating, CrN / Cu coating has a better impact on effective removal of pathogens using ion release as well as contact killing mechanisms. Key Words: Multilayer nanostructured coatings, CrN / Cu, CrN, CAE-PVD, EIS, antibacter

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