Buried Pipelines | Common Specifications, Models, and Prices of Magnesium Alloy Sacrificial Anodes for Tank Exterior Walls and Underground Metal Structures

Uses of Magnesium Anodes: Primarily used for anti-corrosion protection in oil and gas pipelines, water supply and drainage pipelines, underground cables, chemical engineering, communications, harbors, ships, reservoir gates, and other projects in underground and freshwater environments. For example, petroleum and gas pipelines, storage tanks, heat exchangers, condensers, etc. Depending on the alloy ratio, magnesium is definitely used. Since it is an alloy, consumption mainly considers the ease of reaction; magnesium is chemically more active than aluminum.

Cathodic protection systems are used to provide anti-corrosion protection for pipelines, storage tanks, and similar structures. Cathodic protection is divided into two types: 1. Sacrificial anode cathodic protection. 2. Impressed current cathodic protection. Magnesium alloy sacrificial anodes are a type of anode material used in the former. This is a conventional method where a metal more active than the one you are using provides electrons, thereby preventing the metal you are using from providing electrons and undergoing chemical reactions such as rusting or other chemical changes.
This mechanism of using another metal to substitute in the reaction is the anode protection mechanism in electrochemistry, hence it is called sacrificial anode protection. Magnesium anodes have high driving voltage, low current efficiency, and high cost. Depending on their shape and electrode potential (open-circuit potential), magnesium anodes can be used in soil or freshwater environments with resistivity ranging from 20 ohm·m to 50 ohm·m.

Buried Pipelines | Common Specifications, Models, and Prices of Magnesium Alloy Sacrificial Anodes for Tank Exterior Walls and Underground Metal Structures

Characteristics and Functions of Magnesium Anodes:

Magnesium anodes, also known as magnesium alloy anodes or magnesium sacrificial anodes, are used in cathodic protection systems and are important equipment and materials for preventing electrochemical corrosion. Their characteristics include low density, high theoretical electrical capacity, negative potential, low polarization rate, and a large driving voltage for steel (>0.6V), making them suitable for protecting metal components in high-resistivity soils and freshwater environments. Classification of Magnesium Anodes:

Based on production processes, they are mainly divided into cast anodes and extruded anodes.

Based on usage, they are mainly divided into water heater anodes and engineering anodes.

Based on shape, they are further divided into rod-shaped, strip-shaped, D-type, S-type, and custom shapes.

Based on material, they are mainly divided into AZ63, AZ31, AZ91, and other anodes.

Applications of Magnesium Anodes:

Typically, D-type and S-type anodes are used in soil environments, strip anodes are mainly used in high-resistivity soils, freshwater, and confined spaces, serving as engineering anodes; rod anodes are commonly used for anti-corrosion in electric water heaters and boilers.

Magnesium anodes are specifically designed for anti-corrosion materials in cathodic protection projects. They possess high electrochemical performance, consume evenly, have a long service life, and provide high current output, making them suitable for the cathodic protection of metal structures in soil and freshwater media. During the cathodic protection process, magnesium anodes deplete uniformly, resulting in a long service life. In practical applications, magnesium anodes provide more obvious protection for the target structure. In soils with resistivity greater than 8000 ohm·m, the use of magnesium anodes is recommended.