Kinetic study on rapid phosphating compositions for eco-efficient corrosion protection in earth and environmental engineering

Urgench State University named after Abu Rayhan Beruni, 220100 Urgench city, Uzbekistan

^* Corresponding author: sherzod.k@urdu.uz

Abstract

This paper presents a kinetic investigation of rapid phosphating compositions designed for corrosion protection in industrial environments. The formulations incorporate extraction phosphoric acid, furfuryl alcohol, hexamethylenetetramine, and lignin-hydrolysis industry waste with the following composition (wt.% relative to absolutely dry residue): C – 17.34, H – 6.43, O – 43.50, phenol groups (–OH) – 5.06, methoxy (–OCH₃) – 3.06, carboxyl (–COOH) – 1.18, total acidic groups – 6.24, ash – 4.12–2.74. Additionally, the natural mineral vermiculite was used (bulk density 70–180 kg/m³, water absorption 400–530%, pH 6.8–7.0, Mg content 10–14%, K 3–5%, Ca 1.2–2%, Mn 0.8–1%). The kinetic parameters obtained from this study elucidate the mechanisms governing the accelerated phosphating process. These results are significant for developing environmentally safer and more durable protective coatings, thereby extending the operational life of metal structures and reducing resource consumption.