Engineering of corrosion product-polymer hybrid layers for enhanced CO2 corrosion protection of carbon steel part one: Corrosion study and mechanical property investigation

• Published in: Polymer (Guilford) 2022-03, Vol.242, p.124614, Article 124614
• Main Authors: Shaikhah, Dilshad, Barker, Richard, Taleb, Wassim, Lazareva, Anastasija, Mohamed-Said, Maalek, Cowe, Bruce, Neville, Anne
• Format: Article
• Language: English
• Subjects: Adhesion strength; Carbon dioxide; Carbon steel; Carbon steels; CO2 corrosion; Corrosion; Corrosion inhibition; Corrosion prevention; Corrosion products; Corrosion tests; Hybrid layer; Hybrid structures; Iron carbonate; Mechanical properties; Polymers; Steel; Uniform attack (corrosion)
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2022.124614

The role of Poly (allylamine hydrochloride) (PAH) is investigated when applied in-situ during different stages of evolution of an iron carbonate (FeCO3) corrosion product on X65 carbon steel surfaces in a CO2 corrosion environment. We show that PAH adsorbs onto both FeCO3 and the bare carbon steel surface, producing a FeCO3-PAH hybrid structure that reduces both localised and general corrosion. The thickness and mechanical properties of naturally formed FeCO3 and FeCO3-PAH hybrid layers are characterised. The hybrid layers are shown to offer superior adhesion, as well as increased elasticity and delamination resistance compared with the naturally formed FeCO3 layer. [Display omitted] •The FeCO3-PAH hybrid layer is engineered over carbon steel in a CO2-saturated environment.•Characteristics of the hybrid layer are compared with a ‘pure’ iron carbonate layer.•Both the corrosion inhibition mechanism and hybrid layer growth process are determined.•PAH polymer reduces the general and localised corrosion.•The FeCO3-PAH hybrid layer offers superior corrosion resistance and mechanical properties.