Changing the surface properties on naval steel as result of non-thermal plasma treatment

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Hnatiuc, B.^1 ; Sabu, A.^1 ; Dumitrache, C.L.^1 ; Hnatiuc, M.^1 ; Creu, M.^2 ; Astanei, D.^3

Constana Maritime University, Faculty of Naval Electromechanics, Mircea cel Btrân Street no. 104, Constana

900663, Romania^1

Dunrea de Jos University of Galai, Faculty of Automation, Computer Sciences, Electronics and Electrical Engineering, tiinei Street, No. 2, Galai

800146, Romania^2

Gheorghe Asachi Technical University of Iasi-Romania, Faculty of Electrical Engineering, Blvd. Mangeron, No. 21 - 23, Iasi

700050, Romania^3

关键词: Atomic concentration;    Clean technologies;    Electrical discharges;    Environmental conditions;    Industrial conditions;    Non-thermal plasma treatment;    Nonthermal plasma;    Surface activation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/8/082006/pdf
DOI  :  10.1088/1757-899X/145/8/082006

来源: IOP

【 摘 要 】

The problem of corrosion, related to Biofouling formation, is an issue with very high importance in the maritime domain. According to new rules, the paints and all the technologies for the conditioning of naval materials must fulfil more restrictive environmental conditions. In order to solve this issue, different new clean technologies have been proposed. Among them, the use of non-thermal plasmas produced at atmospheric pressure plays a very important role. This study concerns the opportunity of plasma treatment for preparation or conditioning of naval steel OL36 type. The plasma reactors chosen for the experiments can operate at atmospheric pressure and are easy to use in industrial conditions. They are based on electrical discharges GlidArc and Spark, which already proved their efficiency for the surface activation or even for coatings of the surface. The non-thermal character of the plasma is ensured by a gas flow blown through the electrical discharges. One power supply has been used for reactors that provide a 5 kV voltage and a maximum current of 100 mA. The modifications of the surface properties and composition have been studied by XPS technique (X-ray Photoelectron Spectroscopy). There were taken into consideration 5 samples: 4 of them undergoing a Mini-torch plasma, a Gliding Spark, a GlidArc with dry air and a GlidArc with CO2, respectively the fifth sample which is the untreated witness. Before the plasma treatment, samples of naval steel were processed in order to obtain mechanical gloss. The time of treatment was chosen to 12 minutes. In the spectroscopic analysis, done on a ULVAC-PHI, Inc. PHI 5000 Versa Probe scanning XPS microprobe, a monocromated Al KαX-ray source with a spot size of 100 μm2was used to scan each sample while the photoelectrons were collected at a 45-degree take-off angle. Differences were found between atomic concentrations in each individual case, which proves that the active species produced by each type of plasma affects the surface properties of the treated naval steel.