Corrosion Inhibition Coating Based on the Self-Assembled Polydopamine Films and Its Anti-Corrosion Properties.

Shanjian Li,Changwang Guo,Xin Wang,Chong Guan,Gang Chen

doi:10.3390/polym14040794

Shanjian Li, Changwang Guo + Show 3 more

Open Access

https://doi.org/10.3390/polym14040794

Copy DOI

Abstract

Metal corrosion is becoming increasingly serious in oil and gas production, and one way to solve this problem is to modify the metal surface. Thus, a corrosion inhibition coating on the N80 steel was constructed via the self-polymerization and assembling of the dopamine. The optimum reaction condition of polydopamine films was determined by the corrosion rate assessment of the films coated N80 steel, which was the reaction at 60 °C and 5 g/L dopamine in the Tris-HCl buffer solution (pH = 8.5) for 1 h. The spectral results confirmed the existence of the polydopamine coating on the surface of N80 steel, and high stability of the coating in the oil well produced water was observed. The anti-corrosion performance of the polydopamine-coated N80 steel confirmed that high temperature accelerated the anti-corrosion effect of the coating, and the corrosion rate of N80 plate in 90 °C oil well produced water was 0.0591 mm·a−1, lower than the standard value. The corrosion rates of the polydopamine coated N80, A3 and J55 plates at 90 °C were 0.0541 mm·a−1, 0.0498 mm·a−1 and 0.0455 mm·a−1, respectively. No significant effects of the categories of corrosive medium and steel plate on the performance of the coating were observed.

Highlights

At present, the water content of the produced fluid in some oil and gas fields is getting higher and higher [1], and it is often accompanied by high-salinity, high-temperature, acid gas impurities [2]
It can be seen that compared with the blank N80 steel plate, the polydopamine-coated steel plate had a broad peak between 3000–3500 cm−1
The evidence from this study intimates that through the self-polymerization and assembly of dopamine, a corrosion-inhibiting coating is built on the N80 steel, which has an excellent corrosion-inhibiting effect

Summary

Introduction

The water content of the produced fluid in some oil and gas fields is getting higher and higher [1], and it is often accompanied by high-salinity, high-temperature, acid gas impurities [2]. Most oil and gas wellbore and pipeline corrosion inhibitors need to be continuously injected into the fluid for corrosion inhibition, which requires additional work on the part of on-site operators [8,9,10]. One attractive anti-corrosion strategy is to modify the surfaces of wellbore and pipeline to make them have stable corrosion resistance during the production, while reducing the workload. Inspired by mussel adhesion proteins in the ocean, Messersmith et al [11,12] found that dopamine can undergo oxidative self-polymerization in a weakly alkaline environment, thereby forming a polydopamine film on the surfaces of various materials. In the presence of dissolved oxygen, dopamine oxidizes and self-polymerizes to generate polydopamine, which can form a polydopamine coating on the surface of materials of any composition and shape. Polydopamine has been applied to coat various materials, including metals (Au, Ag, Pt), oxides (TiO2 , SiO2 , Al2 O3 , Nb2 O5 ), semiconductors, ceramics, synthetic polymers (polystyrene PS, polyethylene PE, polydimethylsiloxane PDMS, polyurethane PU), etc

Methods

Results

Conclusion