Manufacturing Technology 2021, 21(5):561-574 | DOI: 10.21062/mft.2021.066

Effect of sulfur content in the crude oil to the corrosion behavior of internal surface of API 5L X65 petroleum pipeline steel

Mohd Asyadi Azam ORCID..., Nur Ezyanie Safie ORCID..., Hazwan Hasif Hamdan
Fakulti Kejuruteraan Pembuatan, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76100 Durian Tunggal, Melaka, Malaysia

This work discussed the corrosion behavior of the internal surface of pipeline steel caused by the composition of petroleum products, particularly crude oil. Internal and external pipeline corrosion is the notable cause of pipeline failure in Malaysia’s oil and gas industry. However, internal corrosion is preferred to be concerned in this work because it involved one of the major corrosive media in the crude oil, such as sulfur content. This project aim is to find the sulfur concentration in the crude oil using Fourier transform infrared spectroscopy and atomic absorption spectroscopy. The corrosion rate, corrosion current and corrosion potential of the API 5L X65 grade carbon steel pipeline in different simulated H2SO4 solution concentrations were carried out using the Tafel extrapolation technique. The corrosion properties of the samples were morphologically measured by means of optical microscope, scanning electron microscope and energy dispersive X-ray analyses. The results showed that the corrosion rate of the pipeline steel significantly increased with the increasing H2SO4 concentrations. The corrosion products formed on the pipeline steel surfaces were mainly composed of iron sulfate, iron sulfide and iron oxide. These findings are crucial to understanding the corrosion behavior caused by the crude oil and should be further investigate with the other possible influence factors such as temperature and petroleum’s flowing velocity.

Keywords: API 5L X65 pipeline steel; crude oil; corrosion behavior; H2SO4 concentration; Tafel extrapolation
Grants and funding:

The authors are very grateful to Universiti Teknikal Malaysia Melaka (UTeM) for the financial and facilities support.

Received: December 3, 2020; Revised: June 17, 2021; Accepted: July 2, 2021; Prepublished online: October 21, 2021; Published: November 25, 2021  Show citation

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Azam MA, Safie NE, Hamdan HH. Effect of sulfur content in the crude oil to the corrosion behavior of internal surface of API 5L X65 petroleum pipeline steel. Manufacturing Technology. 2021;21(5):561-574. doi: 10.21062/mft.2021.066.
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