Galvanized Steel Performance in Soil
The corrosion of bare steel in soils varies significantly based on the type and location of the soil. The corrosion rate of steel in soil can range from less than 20 microns per year in favorable conditions, to 200 microns per year or more in very aggressive soils. Thus, highly corrosive soils will dictate the need for a reliable corrosion protection system to ensure long-term protection. In numerous types of soils, hot-dip galvanizing can provide the necessary corrosion protection to extend the life of the steel by many years.
Predicting soil corrosivity is a daunting task that begins with classification of the soil. Due to the varying physical and chemical characteristics of soil, it is extremely difficult to predict underground corrosion rates. Even in very close proximity, soil content conditions can have significant variations. In order to predict the performance of hot-dip galvanized steel in soil, you must first try to classify the soil in which the steel will be embedded. The properties of soil that have the most effect on the corrosion rate of zinc are aeration, moisture content (or time of wetness), pH, temperature, and resistivity.
When data of soil corrosion of HDG steel is viewed in total, there are most commonly four distinct types of soil and they involve the three variables of chloride content, moisture, and pH. View the performance of HDG steel in soil.