Corrosion Inhibitor For Protection Of Steel Research Articles

Akebia trifoliate koiaz peels extract as environmentally benign corrosion inhibitor for mild steel in HCl solutions: Integrated experimental and theoretical investigations

In this account, pectin components were obtained from akebia trifoliate koiaz peels with the acid extraction technology. The chemical constituent of the akebia trifoliate koiaz peels extract (ATKPE) was analyzed and its anti-corrosion performance for mild steel in HCl medium was investigated by electrochemical methods, surface analysis and theoretical calculations. Experimental results show that ATKPE exhibits excellent corrosion inhibition characteristic, and its inhibition efficiency can be as high as 90% when the concentration of ATKPE is 800 mg/L. Electrochemical measurements show that ATKPE is a mixed-type corrosion inhibitor consisting with Langmuir adsorption model. In addition, SEM, AFM and contact angle observations suggests that the ATKPE may attach firmly to the metal surface by forming a barrier film. XPS and ATR-FTIR results further verify the bonding interaction between the functional groups and steel substrate. Meanwhile, quantum chemical calculations and molecular dynamics (MD) simulations were performed to reveal the inhibition mechanism at molecular/atomic level. In brief, our findings demonstrate a novel environmentally benign, efficient corrosion inhibitor for steel protection in acidic media.

Anticorrosive Performance of Mangifera indica L. Leaf Extract-Based Hybrid Coating on Steel.

Ecological awareness brought adequate innovations in the corrosion prevention technology in the last decade. Plant extracts are an interesting category among them, being the rich source of phytochemicals explored as corrosion inhibitors in various electrolytic media instead of toxic synthetic materials. Herein, the most ample tropical plant Mangifera indica L. leaf (MIL) extract was prepared, and its antioxidant ability has been utilized for corrosion prevention of commercial steel in 3.5 wt % NaCl environment. A rich source of polyphenol content provided excellent anticorrosive property. Corrosion prevention occurs by forming an insoluble organometallic complex between metal ions and functional groups in the antioxidants at the metal–electrolyte interface. A new simple strategy is adopted here to make bio-extract containing epoxy coating on steel. An MIL-precipitated amorphous silica hybrid is incorporated in epoxy coating. Electrochemical measurement demonstrated that the developed coating has a superlative corrosion inhibition efficiency of 99%. Thus, the present findings demonstrate a novel environmentally benign, efficient corrosion inhibitor for steel protection in saline media.

Polyaniline and poly(m‐toluidine) prepared by inverse emulsion pathway as corrosion inhibitors in surface coatings

PurposeThe purpose of the paper is to examine the synthesis of polyaniline (PAn) and poly(m‐toluidine) (PmT) via an inverse emulsion polymerisation pathway and evaluate of the synthesised polymers as corrosion inhibitors for steel protection in surface coatings.Design/methodology/approachPAn and PmT were prepared by inverse emulsion polymerisation using ammonium persulphate as an initiator and sodium dodecylbenzene sulphonate (SDBS) as an emulsifier. Spectrophotometric measurements were conducted to characterise the prepared polymers. Latex paint formulations were prepared and dry paint films were evaluated for their physical, mechanical and corrosion protection performance.FindingsThe prepared conducting polymers of PAn and PmT are good candidates for enhancing the corrosion protection of steel. They showed good performance as corrosion inhibitors in latex paints without bad side effects on the physico‐mechanical properties of paint films.Practical implicationsRecent advances in corrosion protection of steel by coatings via inverse emulsion polymerisation of aniline and m‐toluidine have improved performance of anti‐corrosive water‐borne paints. Using formulations based on this new technology, offer uncompromised high performance eco‐friendly anti‐corrosive water‐borne systems that answer the future industrial demands from the economical and environmental points of view.Originality/valuePAn and PmT prepared by inverse emulsion polymerisation showed promising results as corrosion inhibitors for steel protection. The polymerisation process was conducted in water (emulsion polymerisation) and the polymer lattices were incorporated in water borne paints from ecological and economical points of view.

Preparation and characterisation of high performance anticorrosive paints based on novel corrosion inhibitive amide polymers

New types of amide polymers have been prepared and evaluated as corrosion inhibitors for steel protection. Such polymers included o‐, m‐, and p‐ itaconyl phenylene amides, itaconyl o‐ tolidine amide and maleiyl phenylene amide polymers. The polymers were prepared by condensation of equimolar ratios of diamine with itaconic or maleic acids in non‐polar solvents of high boiling point (>135°C) using the Dean and Stark apparatus. The amide polymers obtained were characterised and their structures confirmed based on the micro‐analysis of C, H, and N, the estimated amount of water liberated from the condensation reaction, the IR spectrophotometric measurements and the molecular weight determined by gel permeation chromatography (GPC). The amide polymers obtained were incorporated into paint formulations as corrosion inhibitors for steel protection.

A Novel Series of Corrosion Inhibitive Polymers for Steel Protection

Poly(o-aminophenol), poly(o-aminothiophenol), poly(m-anisidine) and polyaniline have been prepared by chemical oxidation of their monomers using ammonium persulfate at 0°C. The polymers were characterized and their structures confirmed using elemental analysis and spectrophotometric measurements (FTIR, UV-VIS, 1HNMR, MS, XRD and TGA). The polymers were evaluated as corrosion inhibitors for steel protection by measuring their corrosion rates in comparison with the previously prepared polyaniline and the control sample. The polymers show a high performance as efficient corrosion inhibitors, and promising results were achieved when the polymers were incorporated in various paint formulations to replace a major part of the inhibitive pigments and to replace the classical toxic corrosion inhibitors of low molecular weights and low melting points. These results are very important from an economic and safety points of view.