Corrosion Inhibition Performance of Lignin Extracted from Black Liquor on Mild Steel in 0.5 M H2SO4 Acidic Media

Abstract

In this study, lignin, a polyhydroxy compound, was extracted from black liquor of pulp and paper industry, and characterized. In view of the potential of such polyhydroxy compounds to adsorb onto metal surfaces, the corrosion inhibition efficiency of lignin on the corrosion of mild steel by 0.5 M H2SO4 has been studied using weight loss method, electrochemical polarization and impedance methods. The morphological changes of the surface during corrosion, in the presence and absence of the inhibitor, were studied by scanning electron microscopy. Results of these studies show that lignin does inhibit the corrosion of mild steel by sulfuric acid, and that the inhibition efficiency increased with lignin's concentration.

From Waste to Valuable Resource: Lignin as a Sustainable Anti-Corrosion Coating

“…Additionally, it was also found that protonated lignin molecules adsorbed electrostatically to the metal surface, resulting in a decreased rate of Cl − adsorption to the surface. Similar investigations of mild steel corrosion in both near neutral 3.5% NaCl solution [10] and 0.5 M H 2 SO 4 [13] have further demonstrated the ability of lignin to act as a corrosion inhibitor in both the anodic and cathodic branches of LSV diagrams. Therefore, it was concluded that lignin molecules adsorb to the mild steel surface-to form ferric-lignin compounds-via the functional hydroxyl groups (specifically phenolic -OH) present, resulting in an increase in charge transfer resistance that led to the observed corrosion inhibition.…”

“…As far as the authors are aware, despite lignin's well-known properties such as water impermeability [7], hydrophobicity [2], and film-forming ability [8], as well as low cost and abundance, pure lignin has not been suggested as a polymeric corrosion protection coating for metal surfaces. So far, lignin has only been studied as a minor additive to barrier coatings from the perspective of structural, mechanical [2,9], and corrosion inhibition [10][11][12][13][14]. Furthermore, the antimicrobial properties [9] and biocompatibility [15] of this material could widen the application range to include functional coatings, used for example in biomedical applications.…”

Exploration of the effect of Zn-MgO-UPP coating on hardness, corrosion resistance and microstructure properties of mild steel

“…The deterioration and operational failure of mild steels have been studied extensively due to their continued relevance in the manufacturing and construction industries [1]. As one of the leading engineering materials, the ready availability and low cost of mild steel have engendered their choice and usage for several engineering applications [2,3]. In spite of the continuous usage of many grades of mild steel, corrosion degradation on exposure to environmental contaminants within a short time of application has reportedly been a challenge [4,5].…”

Synthesis of Cerium‐Doped Zirconia Nanoparticles for the Electrochemical Detection of Dopamine by Modified Carbon Paste Electrode

“…[32] But these methods use toxic chemicals and are hazardous to nature. Hence this paper describes the environmentally friendly and simple co-precipitation method [33] In the present work Cerium doped zirconium nanoparticles were synthesized and used for the electrochemical sensing of DA. The Ce doped ZrO 2 /MCPE modified electrode exhibited very low detection limit with high sensitivity for DA.…”