Cathodic Protection Integrity management

Types of sacrificial anodes and their benefits

Sacrificial anodes are elements that are installed in pipes or tanks so that the whole system is free of corrosion, when they are implemented they displace all the corrosion towards them and thus protect the metal. In order to generate this effect, the materials to be used must be pure, such as zinc, magnesium or aluminum.

These objects have different advantages in use since they can be used where there is no power, their cost is not high, they do not require detailed supervision and their installation is relatively simple; but it is important to carry out periodic inspections and replace them when they reach the end of their useful life.

Types of sacrificial anodes

Zinc sacrificial anodes: A zinc anode or galvanic anode is used to prevent corrosion by cathodic protection. This anode is most recommended for application in areas where metals that are located in salt water need to be protected. These are some of its advantages:

They do not require an external power supply.
They are easy to install.
They have a low tension.
They are not costly to maintain.
They are at low risk of overprotection.

Magnesium sacrificial anodes: Magnesium is one of the anodes with the highest drive voltage, it is a low metal on the noble scale and therefore has an easy corrosion. This anode is most often used in fresh water.

Aluminum sacrificial anodes: Aluminum anode are commonly used in corrosion-free industrial equipment, are the least dangerous in salt water, have a longer life, are thicker than other types of anodes achieving longer life and can be used in any type of water.

Sacrificial anodes are used to protect ship hulls, water heaters, pipelines, distribution systems, above ground tanks, subway tanks and refineries. Consult a #TICE Expert for cathodic protection systems.