Definition - What does Silica Gel mean?
Silica Gel is a form of silicon dioxide that is vitreous and porous in nature. It is mainly used as a drying agent and in corrosion prevention due to its ability to suck up moisture through capillary condensation or adsorption. Its high specific surface area makes it a useful and convenient desiccant or dehumidifier. Silica gel is available in various configurations depending on its application.
Petropedia explains Silica Gel
The importance of silica gel in cathodic protection is the reduction of the rate of hydroxyl ions formation. This is achievable by absorbing all the humid or moisture present around a metal. In the industries, silica gel packaging is modified to change color depending on the saturation of moisture absorbed. The reusability of the material, through heating, makes it suitable for temporary corrosion protection methods.
Silica gel is used as a desiccant placed in permeable bags that are later used in containers or placed around the material to be protected against corrosion. It is mostly used to protect steel substrates as it does not react chemically with metals.