Introduction

In advanced technological era corrosion is still considered a major problem because it is the main cause of industrial failures and loss of billions of dollars annually for preventive maintenance and restoration of metal substrates. Corrosion resistant paints protect metal components against degradation due to the moisture, salt spray, oxidation or exposure to a variety of industrial chemicals. Anti-corrosion coating allows for added protection of metal surfaces and acts as a barrier to inhibit the contact between chemical compounds or corrosive materials. Addition of nanoparticles as fillers to the polymeric paints not only increases their efficiency in terms of corrosion resistance but also improves their mechanical properties.

Introduction

Corrosion is the gradual destruction of materials by chemical reaction with their environment. It degrades the useful properties of materials and structures including strength, appearance and permeability to liquids and gases. The amount by which a corrosion coating reduces the rate of corrosion varies depending on the kind of metal and its environment, and is notably slower in room temperature air for aluminum, chromium, zinc, titanium, and silicon. Because of excellent corrosion resistance, thermal stability and less conductivity, SiO2 is an excellent anti-corrosion material. Inactivity and low cost make silica an excellent filler and extender for paint. Adding silica to paint creates textural qualities in paint without affecting its color. Silica has little color in drying oil, so it can be added to oil paint without affecting the tint of the color. Due to its hardness it tends to add a discernible texture to paint.