A Mannich base 1-phenyl-3-(1-pyrrolidinyl)-1-propanone: synthesis and performance study on corrosion inhibition for N80 steel in 15% hydrochloric acid

Abstract

Purpose – The purpose of this paper is to set out a study of a Mannich base, which was synthesized and used as an acidizing corrosion inhibitor first, and to the corrosion inhibitor mechanism. Design/methodology/approach – A Mannich base, 1-phenyl-3-(1-pyrrolidinyl)-propanone (PHPP), was synthesized with acetophenone, pyrrolidine and formaldehyde at pH = approximately 2-3. The structure of PHPP was characterized by elemental analysis and Fourier transform infrared spectroscopy (FTIR). The corrosion inhibition of PHPP on N80 steel in 15 per cent hydrochloric acid (HCl) was studied by weight loss method, scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX), and the adsorption behavior of PHPP on the surface of N80 steel was discussed. Findings – The results showed that the inhibition efficiency reached to 99.8 per cent and corrosion rate was 2.65 g·m-2·h-1 at 0.6 per cent of PHPP concentration in 15 per cent HCl, which indicated that PHPP presented excellent corrosion inhibition performance. The results of SEM and EDAX analysis showed that PHPP could be absorbed on the surface of N80 steel. The adsorption process of PHPP on the surface of N80 steel was chemisorption. This process was spontaneous and obeyed Langmuir adsorption isotherm. Originality/value – It was found that PHPP presented excellent corrosion inhibition performance, and it is practicable to enhance oil production in oilfield development as a oil-well acidizing inhibitor. The study results can provide theoretical guidelines for the development of the inhibitor.

Localized Corrosion Mechanism of Q125 Casing Steel in Residual Acid Solution during Oil Reservoir Acidizing

“…The results of Ayeni et al [13] and Ferkous et al [15] also support this view. Pan et al [16] studied the effect of hydrophobic group carbon chain length on the corrosion inhibition efficiency of N80 steel in 15% HCl solution and determined that when the inhibitor content was less than 0.6%, the Mannich base inhibitor with short carbon chain had better corrosion inhibition performance. Guo et al [17] synthesized a double Mannich base inhibitor using N-octylamine, acetophenone, and formaldehyde as the main raw material and reported that a double Mannich base inhibitor compared to a single Mannich base corrosion inhibitor had higher corrosion inhibition efficiency.…”

Experimental and theoretical research on a new corrosion inhibitor for effective oil and gas acidification

“…3,5,35 Most literature reports the use of a Mannich base as a corrosion inhibitor for effective oil and gas acidication. 9,36,37,41 Although Mannich bases have a good inhibition effect, there are still many problems that limit their application such as high cost, toxicity and instability. With the enhancement of people's awareness of environmental protection, research on green corrosion inhibitors represented by quaternary ammonium salt ionic liquids has received more and more attention.…”