Investigation Nano-coating for the Corrosion Protection of Petroleum storage tanks Steel

Ali, Zainab Z.; Mahdi, Baha S.; Thamer, Ameen D.

doi:10.30684/etj.2022.131942.1074

Document Type : Research Paper

Authors

¹ production and metallurgy department, university of technology, Baghdad, iraq

² Production and Metallurgy Engineering Dept, University of Technology-Iraq, Alsina’a Street, 10066 Baghdad, Iraq.

10.30684/etj.2022.131942.1074

Abstract

This work studies the protection from corrosion in the inner surface of petroleum storage tanks by applying nano-coating on the AISI1018 steel type used in these tanks. BNi-2 alloy, used as coating layer, was deposited using the DC sputtering technique to obtain protection layers of nano-coating. The cyclic potential dynamic polarization technique is used to study and evaluate the resistant metal to localize corrosion, for example, pitting and crevice corrosion. The samples were evaluated in a 3.5% NaCl aqueous solution using the polarization method to determine the corrosion rate. The input parameters of deposition included ion current 16 mA, vacuum 10^-1 mbar, time of deposition was 60 minutes, and the distance between target and substrate was 2.5 cm. The surface roughness of the uncoated specimens was (0.1466 µm), and after coating, it decreased to (0.0933µm). The most important factor that affects the corrosion of the coated steel surface is the surface topography of steel before coating, as it is known that the spattering process coats the facing surface to target better than the inclined surface topography. Therefore, some micro scratches non-coated well worked as nucleation for corrosion as detected in stereo microscope images for coated and uncoated surfaces. By calculating the corrosion rate from cyclic potential dynamic polarization for coated and uncoated workpieces, pitting and crevice corrosion improved approximately ten times compared to the uncoated AISI1018 steel surface.

Graphical Abstract

Highlights

Using the BNi-2 alloy nano layer improves corrosion resistance.
Applying DC sputtering as a coating method.

Predicting generated phases for the nano-coating from EDX analysis on equilibrium phase diagrams.

Keywords

Main Subjects

Production & Metallurgy

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Investigation Nano-coating for the Corrosion Protection of Petroleum storage tanks Steel

References

Volume 40, Issue 12 Production & Metallurgy Engineering, Material Engineering,19 ArticlesDecember 2022Page 1615-1623

Volume 40, Issue 12
Production & Metallurgy Engineering
, Material Engineering,19 Articles
December 2022
Page 1615-1623