Chapter 10 - MgO as corrosion inhibitor

Abstract

A variety of inorganic materials have been explored as efficient corrosion inhibitors and/or anticorrosive coating ingredients for several susceptible metallic substrates in order to protect them from the corrosive nature of the environment. Among the inorganic materials, magnesium oxide or magnesia (MgO), is also used as a corrosion inhibitor in such aggressive environments. It finds use as a corrosion inhibitor for many substrates exposed to many corrosive environments in industrial applications, such as NaCl solution, fuel oil, simulated body fluid, and gas turbine environments. Though MgO exhibits corrosion inhibition properties on metal substrates, it can be further enhanced by its simultaneous application with other materials. In this chapter, an overview of the latest uses and advances on the enhancement of MgO as a potential corrosion inhibitor has been outlined. Herein, initially, the important properties of MgO as corrosion inhibitors and anticorrosive materials have been addressed briefly. Secondly, the mechanisms of corrosion inhibition behavior exhibited by MgO in different corrosive environments have been explained in detail. Thirdly, the latest trends on the application of MgO composites or nanocomposites as anticorrosive materials used in several corrosive environments and adverse conditions have been strongly emphasized and discussed. Lastly, the future perspectives on the incorporation of MgO as corrosion-inhibiting or anticorrosive materials in coating formulations have been discussed.