Abstract
Surface treatments of materials have attracted intensive studies in recent years, and considered as an important way for providing protection properties. In this paper, oxygen plasma treatment was used on API 5L X52 carbon steel. The produced deposit was characterized by different methods; optical and electronic microscopy, microhardness measurements and X rays diffraction. The resulting layer has been evaluated by electrochemical methods and pitting corrosion tests. The results showed that Fe2O3, which resulted from coating treatment by oxygen plasma, improved the superficial microhardness of steel. In chemical terms, pitting corrosion tests in corrosive solution showed a clear decrease of the weight loss and pitting percentage in coated coupons. Moreover, electrochemical corrosion tests (linear polarization and electrochemical impedance spectroscopy tests) showed that the produced deposit after coating gived a good protection against corrosion. This study demonstrates that oxygen implantation provides protective properties to API 5L X52 carbon steel.
Highlights
Carbon steels and API 5L X52 are widely used in oil and gas industry
The material used in this study was an API 5L X52 carbon steel with the following chemical composition given by X-ray fluorescence : 0.2%C, 96.35%Fe, 0.078%Cr, 0.078%Ni, 1.179%Mn, 0.15%Si, 0.17%Cu, 0.04%V, 0.01%S, 0.01%P, 0.01%Al, 0.05%K, and 0.07%Cl
scanning electron microscopy (SEM) observations on the formed deposit showed swellings aspect; their composition given by EDS reveals essentially iron and oxygen, it has been demonstrated that it is the hematite (Fe2O3) [31] which was the result of combination of implanted oxygen with steel’s iron atoms
Summary
Carbon steels and API 5L X52 are widely used in oil and gas industry. This is essentially due to economical consideration. In the case of petroleum industry, such steels exhibit a poor corrosion resistance. In order to increase their resistance to corrosion, many methods have been proposed. Ion implantation is a common technique used to modify the near surface materials. It leads to the formation of thin surface layers of stable or non stable components. As a consequence it has been considerated that the corrosion resistance of various materials could be improved by ion implantation. No general law can be deduced from the literature and implantation can either enhance [5] or reduce the corrosion phenomenon [6, 7]
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