What is the sacrificial anode protection technology and what are its advantages and disadvantages

Sacrificial anode protection technology as an important means of metal anticorrosion, its application in anticorrosion engineering is more. However, not all metal anticorrosion projects need to use sacrific anode protection technology. We can also use forced current cathodic protection law, brush anticorrosive paint and other ways to carry out anticorrosion of metal tubes. So do you know what sacrificial anode protection technology is, what are the advantages and disadvantages of sacrificial anode protection technology?

Knowledge point 1: Definition of sacrificial anode protection technology

Sacrificial anode protection technology is depend on the potential negative metal (magnesium alloy sacrificial anode) constantly produced by the corrosion dissolution current to protect the protected metal, anode material than to protect metal negative potential, with the protected metal electrical connection together, its instead protected metal corrosion, namely sacrificial anode.

Knowledge point 2: Magnesium alloys sacrifice the advantages of anode protection technology

The utilization rate of the protection current is high, and the over-protection phenomenon rarely occurs. The construction technology is simple, the investment cost is low, it does not need special professional maintenance management in the operation process, do not need to pay maintenance costs; It will not disturb the adjacent underground metal facilities. It is suitable for the protection of plant area and long distance pipelines without power supply, as well as small-scale dispersed pipelines. Magnesium alloy sacrificial anode protection technology has the dual functions of grounding and protection at the same time.

Knowledge point 3: Magnesium alloy sacrificial anode protection technology shortcomings

The driving potential is low, the use range is limited by the soil resistivity, and the regulation range of current protection is narrow; Service life sacrifice anode life limit, need to be replaced regularly; There is a strong stray current interference area in the construction of cathodic protection, and the reversal is likely to occur due to ac interference.