How do magnesium anodes protect metal pipes? What are the specific advantages of magnesium anodes?

Anode material is an important raw material for cathodic protection. Through the consumption of magnesium anode, metal pipe is protected. So do you know how magnesium anodes protect metal tubes? In order to effectively increase the anticorrosion performance of metal pipes, we will be based on the production of magnesium anode, magnesium anode mixed with some other metal elements, the formation of magnesium anode, then magnesium anode and magnesium anode compared with what advantages? This chapter jiaozuoLadbrokes light alloy will give you a brief introduction.

Knowledge points

1: understand the working principle of magnesium anode

According to the electrochemical principle, if the electrolyte composition, adhesion impurities, stress and air permeability around the metal pipe are different, electrochemical corrosion is easy to occur. By applying cathodic protection, in the electrochemical corrosion solution of magnesium anode, electrons flow from the solution to the cathode, and positive ions entering the solution flow from the electrolyte anode to the cathode region to form a current loop, so that the anode corrodes, thus protecting the metal pipe.

In order to make magnesium anodes suitable for various corrosive environments, magnesium anodes can be made into various shapes according to the different objects to be protected, such as rod magnesium anodes with D-shape or trapezoidal section in soil and water, cylindrical magnesium anodes with extruded heat exchangers, and ribbon anodes in high resistivity soils.

Knowledge points

2: advantages of magnesium alloy anode

Pure magnesium is more reactive and can be used either directly as a sacrificial anode or by addition of elements. The magnesium anode is formed by adding metal elements to the magnesium anode, and the performance of the magnesium anode is better than that of the pure magnesium anode, because the alloy composition of the anode material has an important effect on the effective potential and current efficiency of the anode, and even a small amount of impurities will affect the main performance of the magnesium anode.