Abstract: The invention relates generally to corrosion sensors having one or more linear reactive impedance corrosion element capable of detecting both general and local corrosions, and to methods for detection same.

Abstract: A resin including a plurality of colloidal metal oxide particles; a silane, and a water dispersible polymer is disclosed. The silane includes an amino silane or uredosilane or both. A corrosion inhibitor is also disclosed. The corrosion inhibitor includes a conducting polymer or conducting oligomer with a conjugated structure that provides electric conductivity when doped; and an anion. The anion includes at least one anion selected from a group consisting of phosphomolybdate anion, permanganate anion, dichromate anion, ferrate anion, molybdate anion, salicylate anion, ethylenediamine tetraacetic anion, and amino acid anion. A coating composition including the resin and a corrosion inhibitor is disclosed. Also disclosed are methods of making the resin and the coating composition and method of treating a substrate with the coating composition.