Abstract
<p class="AMSmaintext">Plasma electrolytic saturation (PES) is an atmospheric pressure plasma deposition which is used for fabrication of nanostructural coatings. This process starts with the appearance of some sparks on the surface and finally by the formation of plasma envelope around the sample, particles and free radicals bombard the surface and diffusion takes place into the work-piece. In this paper, the effect of frequency (500, 1000 and 10000 Hz) as pulse parameters on properties of nitrocarburized layers deposited on AISI 1045 steel were investigated. The analytical characteristics of the coating were assessed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The corrosion behavior of coatings was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in 3.5% sodium chloride solution. Moreover, the microhardness and wear resistance of coated samples were also studied. The results indicated that applying nitrocarburized layer in all cases, improved the corrosion resistance, microhardness and also wear resistance of the substrate. The coatings treated at the frequency of 10000 Hz, had corrosion resistance about 2.4 and 1.4 times higher than those of the samples prepared at the frequency of 500 Hz and 1000 Hz. The surface hardness of 10000 Hz treated sample was about 1040 Vickers, which was more than those of the two other ones. An increase in frequency also caused wear resistance to increase. </p>
Highlights
AISI 1045 steel are from plain carbon steels family with good mechanical and metallurgical properties, have a relatively affordable price, which has been used in many applications like the cantilever, excel, connecting rod, crankshaft, small gears and as a particular drilling application in the oil industry [1]
The surface temperature was raised, this was in good agreement with literature reports [13]
The results showed that formation of nitrocarburized films on AISI 1045 steel surface caused a decrease in corrosion current densities and made samples highly corrosion resistant
Summary
AISI 1045 steel are from plain carbon steels family with good mechanical and metallurgical properties, have a relatively affordable price, which has been used in many applications like the cantilever, excel, connecting rod, crankshaft, small gears and as a particular drilling application in the oil industry [1]. Common diffusion coating methods cause an increase in temperature of sample and may affect the properties and structure of the base metal. Since the voltage in this process is very high, quenching the samples in electrolyte cause nitrogen and carbon atoms /free radicals to diffuse into the surface. Acceleration of high energy particles and atoms from electrolyte toward the substrate surface is the main cause of higher diffusion depth in this method compared to other methods. One of the most important features of this method for fabrication of nanostructure is a strong relationship between effective parameters and properties which are related to the nanometric This process compared to other processes of producing nano structural coatings has a good potential to be in industrial lines. The main aim of the present investigation is to demonstrate the feasibility of PEN/C coatings on AISI 1045 substrate and study the effect of frequency on the microstructure, corrosion properties, hardness, and wear behavior of this coating
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