Corrosion Protection of Carbon Steel Oil Pipelines by Unsaturated Polyester/Clay Composite coating (original) (raw)

Uploaded (2023) | Journal: American Scientific Research Journal for Engineering, Technology, and Sciences

Abstract

The EIS measurements for coated specimens after polarization show higher values of total impedance |Z|, polarization resistance (R p ) and low capacitance (C) in comparison with the un-coated carbon steel specimen. This indicates the stability of the surface protected film of these coated specimens and their resistance against dissolution. The aim of this paper is to prepare a protective coating on API 5L (carbon steel) alloy which is the widely used materials in oil industry and study its effect on the corrosion behavior of the carbon steel in crude oil environment. Unsaturated polyester (UP) and clay were used to prepare composite consist of 75% of polyester and 25% of clay. The coated specimen was investigated in comparison to uncoated and 100% polyester coated specimens. X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were employed on the coated specimens to understand the phases formed on the modified surfaces. The corrosion behavior of the modified surface in co...

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What explains the corrosion resistance of polyester/clay composite coatings?add

The study reveals that 25% clay and 75% polyester composites show superior corrosion resistance with no pitting observed compared to uncoated carbon steel. Electrochemical polarization studies indicate more uniform corrosion behavior for the coated samples.

How does clay loading affect the mechanical properties of polyester composites?add

Increasing clay content in the polyester matrix results in enhanced surface toughness due to stress disturbance mechanisms. However, at 25% clay loading, the presence of aggregates can reduce mechanical performance.

What methodologies were used for electrochemical studies in this research?add

Cyclic polarization and Electrochemical Impedance Spectroscopy (EIS) were employed to evaluate corrosion behavior in a simulated oil environment. The testing utilized a three-electrode configuration to obtain comprehensive corrosion parameters.

What are the thermal and electrical properties of the polyester/clay composite?add

The research finds that the polyester/clay composites exhibit improved thermal stability and reduced gas permeability. These enhancements are attributed to the unique intercalation and exfoliation characteristics of clay within the polymer matrix.

When were the electrochemical measurements taken during the study?add

Electrochemical measurements were conducted after applying the coatings on the specimens and cleaning them with ethanol. The polarization studies analyzed the coated specimens immediately in a crude oil simulated solution.

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