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

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.

Preparation and Laboratory Testing of Polymeric Scale Inhibitor Colloidal Materials for Oilfield Mineral Scale Control

“…As an important group of scale inhibitors, most polymeric inhibitors contain little or no phosphorus element, making these materials substantially more environmentally friendly compared with aminophosphonates. Thus many polymeric inhibitors are regarded as “green inhibitors” [ 4 , 5 , 22 , 23 ]. Moreover, due to the versatile molecular structures of polymeric inhibitors, many polymeric inhibitors have unique advantages over aminophosphonates, such as a higher calcium tolerance, higher thermal stability, and a wider range of pH tolerance [ 8 ].…”

Photothermal-Responsive Wormlike Polydopamine-Wrapped Ethylene-Vinyl Acetate Copolymer toward Triple-Action Self-Healing Anticorrosion Coating

“…As exhibited in Figure a, an obvious peak centered at 1635 cm –1 was detected for all samples, assigning to absorbed moisture. Beneath pure EP, the main components of corrosion products were γ-FeOOH (1020 cm –1 ) and α-FeOOH (615 cm –1 ). , Especially, a characteristic peak at 1512 cm –1 corresponding to the shear vibration of N–H was observed beneath PDA@EVA/EP, besides a broad adsorption peak exhibited around 3500–3000 cm –1 , ascribing to stretching vibration of catechol and secondary amino groups. , These observations proved the existence of PDA on the steel surface, supporting the possibility of PDA on inhibiting metal corrosion. Raman characterizations also were applied to investigate the corrosion products composition (Figure b), mainly involving γ-FeOOH (213 and 1308 cm –1 ), α-FeOOH (276 and 385 cm –1 ), and Fe 3 O 4 (691 cm –1 ). − The presumable reaction process of different types of corrosion products generated beneath pure EP could be clarified as follows: The fast infiltration of aggressive species (such as O 2 , H 2 O, and Cl – ions) through the opened scratch channel resulted in the damage and dissolution of lots of generated Fe 2 O 3 (main component in Fe 3 O 4 ) (Figure b) .…”

“…68,69 Especially, a characteristic peak at 1512 cm −1 corresponding to the shear vibration of N−H was observed beneath PDA@EVA/EP, besides a broad adsorption peak exhibited around 3500−3000 cm −1 , ascribing to stretching vibration of catechol and secondary amino groups. 70,71 These observations proved the existence of PDA on the steel surface, supporting the possibility of PDA on inhibiting metal corrosion. Raman characterizations also were applied to investigate the corrosion products composition (Figure 10b), mainly involving γ-FeOOH (213 and 1308 cm −1 ), α-FeOOH (276 and 385 cm −1 ), and Fe 3 O 4 (691 cm −1 ).…”

Improving the Anticorrosion and Self-Healing Properties of the Epoxy Coating Using the Mn–Zn2SiO4/PDA Composite

“…29,30 The remarkable adaptability, strong adhesion to substrates, environmentally friendly degradation, and self-healing capabilities make PDA a promising material for corrosion-resistant modification. Li et al 31 applied a PDA anticorrosion coating on the surface of N80 steel through PDA self-polymerization and assembly. They observed that the PDA coating exhibited excellent stability in produced water from oil wells and maintained stable anticorrosion performance under high-temperature conditions.…”