Abstract

The corrosion inhibition of mild steel in the oilfield brackish water and effluent water has been studied in relation to the concentration of the thiourea (as corrosion inhibitor) as well as the temperature using the weight-loss method. The mild steel corrosion coupons were processed and evaluated as per international standard procedures i.e. NACE SP-0775 2013 and ASTM G1–03. The results were supplemented with scanning electron microscopy (SEM) and infra-red (IR) spectroscopy. The presence of the C=S group, which enhances the electron density on the molecule acts as the active site for corrosion inhibitor adsorption leading to a stronger bond with the metal surface through physio-chemical adsorption by the formation of a protective barrier film. The synergetic effect of potassium iodide in corrosive media has been found to stabilize the adsorption, leading to improved inhibition efficiency. The results showed that Thiourea is a good corrosion inhibitor.

Abstract

Hexamethylenetetramine (HMTA) was found suitable as a corrosion inhibitor on mild steel in Brackish Water (BRW) by weight loss methods with respect to time, concentration, and temperature measurements. Corrosion Inhibitor film efficiency depends on the chemical concentration and contact time with the surface of mild steel. As the temperature increases Corrosion Rate increases but mostly Inhibition Efficiency decreases. Thermodynamic factors show that the adsorption on mild steel followed both physiochemical adsorption mechanisms. The synergetic effect of potassium iodide (KI) in corrosive media has been found to stabilize the adsorption, leading to improved inhibition efficiency and found to control general and pitting corrosion rate to the maximum extent. Hexamethylenetetramine has been studied by keeping consideration of International Standard procedures i.e. NACE SP-0775 2013 and ASTM G1–03. The results were supplemented with scanning electron microscopy (SEM) and infra-red (IR) spectroscopy. The results showed that HMTA is a good corrosion inhibitor.

Abstract

Corrosion of mild steel in effluent water (EFW), producing severe destructive problems in systems such as equipment and piping systems as well as pipelines. The use of chemical treatment has found to be an inexpensive and easiest method for corrosion protection in EFW. The corrosion inhibition of mild steel in oilfield effluent water has been studied in relation to the concentration of the hexamethylenetetramine (as corrosion inhibitor) as well as the temperature using weight loss method. The mild steel corrosion coupons were processed and evaluated as per international standard procedures i.e. NACE SP-0775 2013 and ASTM G1–03. The results were supplemented with scanning electron microscopy (SEM) and infra-red (IR) spectroscopy.

Abstract

The aim of study is to check the effective control on corrosion by Hexadecyltrimethylammoniumbromide as corrosion inhibitor on mild steel in the aqueous environment containing Brackish Water (BRW) and Effluent Water (EFW). Corrosion is a natural process and it occurs on mild steel producing severe destructive problems in systems such as equipment and piping systems as well as pipelines. The use of chemical treatment has found to be an inexpensive and easiest method for corrosion protection in BRW and EFW. The chemical treatment slows down the general corrosion and pitting corrosion rate and thus inhibit economic losses due to metallic corrosion. In this paper, the effects of Hexadecyltrimethylammoniumbromide on mild steel were investigated by weight loss methods keeping consideration of International Standard procedures i.e. NACE SP-0775 2018 and ASTM G1–03. Corrosion Inhibitor film efficiency depends on the chemical concentration and contact time with the mild steel metal surface.  The results were supplemented with Fourier Transform Infrared spectroscopy (FT-IR) spectroscopy. The results showed that HDTMABr can control corrosion, so this is an effective corrosion inhibitor.

Abstract

The effect of Hexadecyltrimethylammonium Bromide as corrosion inhibitor on mild steel in Brackish Water and Effluent Water was studied by weight loss technique at temperature range of 25^oC, 30^oC, 40^oC and 50^oC. The thermodynamics factors such as ∆ is the change in enthalpy of activation  apparent activation energy, ∆ is the change in entropy of activation were determined for inhibitive properties of Hexadecyltrimethylammonium Bromide and the adsorption parameters like ∆G_ads, ∆ and ∆ were determined and discussed. The corrosion rate (CR) of mild steel increased and inhibition efficiency (IE) decreased with increase in temperature and follows Arrhenius equation in all concentrations. Adsorption of HDTMABr on the mild steel surface obeyed the Langmuir adsorption isotherm. HDTMABr is a mixed type of inhibitor. The results were well supported by SEM studies.

Key Words:  Hexadecyltrimethylammonium Bromide (HDTMABr), Mild steel, Activation energy, Gibb’s Free Energy, Scanning Electron spectroscopy (SEM).