Tuning Crystallite Size and Corrosion Resistance of Tin Oxide Coatings via Solvent‐Controlled Sol–Gel Synthesis

Corrosion of metallic materials has significantly affected global economies, prompting the development of various anticorrosion coating technologies aimed at preventing or minimizing such damage. This study focused on synthesizing an enhanced coating utilizing tin oxide (SnO 2 ) prepared by the sol–gel method in different solvents such as water (W‐SnO 2 ), ethanol (E‐SnO 2 ), and methanol (M‐SnO 2 ). The synthesized tin oxide powders are analyzed using structural, morphological, optical, and electrochemical analysis. The synthesized powder exhibited a tetragonal SnO 2 crystal structure, and the solvents influenced the morphology, resulting in larger and smaller nanoparticles. Also, this research explores the corrosion behavior of SnO 2 coatings in various environments (acid, base, and neutral) by evaluating their corrosion behaviors. The W‐SnO 2 sample exhibited lower values of corrosion potential (E corr = −0.121 V) and corrosion current density (I corr = 1.38 µA cm −2 ) in the base medium. The SnO 2 coatings demonstrated superior anticorrosion performance in a KOH medium, with the W‐SnO 2 coating exhibiting the most effective corrosion resistance among all the coatings tested due to the smaller size of nanoparticles (∼118 nm).