Investigation of the anticorrosion performance of lignin coatings after crosslinking with triethyl phosphate and their adhesion to a polyurethane topcoat

Functional surfaces, films, and coatings with lignin – a critical review

“…For example, Dastpak et al reacted lignin with triethyl phosphate to spray-coat iron-phosphated steel for corrosion protection. 44 Coating of aminosilica gel with oxidated Kraft lignin was performed by electrostatic deposition, which improved the adsorption capacity for dyes from wastewater. 102 Wang et al phenolated lignosulfonate, followed by Mannich reaction with ethylene diamine and formaldehyde to produce slow-release nitrogen fertilizers.…”

“…40,41 Other applications of lignin, its derivatives and mixtures include the use for controlled-release fertilizers, antifouling membranes, re retardancy, dye sorption, wastewater treatment, and corrosion inhibitors. [14][15][16][42][43][44] One publication even reported an unintentional but yet advantageous coating of coir bers, where the lignin delayed oxidation and thermal degradation of the bers in a polypropylene composite. 45 Major drivers for using lignin are economical aspects by attributing value to a by-product from pulping or biorenery operations, and sustainability by replacing fossil-based materials with biopolymers.…”

Molybdate and Phosphate Cross-Linked Chitosan Films for Corrosion Protection of Hot-Dip Galvanized Steel

“…[10][11][12]14,15,21 For improving corrosion protection, phosphates have been used, e.g., in the cross-linking of lignin. 22 Phosphate-containing polymers are other promising corrosion inhibitors. 23 Chitosan is a soluble derivative of a highly available natural polysaccharide: chitin.…”

“…Conversion coating of HDG steel is usually performed by phosphating. − Molybdate is a well-known corrosion inhibitor − and arises as an alternative to traditionally used chromates which are phased out and as a complementary option to phosphate-based passivation methods. In the past decades, molybdates have been exhaustively studied and have successfully been used as corrosion inhibiting components, e.g., in antifreeze solutions in automobile cooling systems, and in aluminum alloys to increase pitting potential and reduce passive current. − Molybdate has been used as an additive in phosphate conversion to accelerate the phosphating process, , and it has been reported to enhance corrosion resistance of zinc and several other metals. ,,, Furthermore, molybdates have been used for protection of several alloys in different systems as less aggressive components. − ,,, For improving corrosion protection, phosphates have been used, e.g., in the cross-linking of lignin . Phosphate-containing polymers are other promising corrosion inhibitors …”

“… 10 − 12 , 14 , 15 , 21 For improving corrosion protection, phosphates have been used, e.g., in the cross-linking of lignin. 22 Phosphate-containing polymers are other promising corrosion inhibitors. 23 …”