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In industrial production, to ensure normal operations and extend the lifespan of equipment, manufacturers often employ various anti-corrosion products. Among these, sacrificial anodes are among the most effective in terms of performance and practical utility. So, what is the current state of sacrificial anode application? Let's hear what industry experts have to say.
According to experts specializing in the research, development, and production of aluminum alloy anodes, sacrificial anodes are used to protect steel equipment by bonding a metal or alloy that is more susceptible to electron loss. They are typically used economically only on structures requiring low current and in environments with low soil resistivity.
The sacrificial anode utilizes the principle of a corrosion galvanic cell, which forms due to a potential difference. The electrode with the lower potential is typically called the anode, while the electrode with the opposite higher potential is called the cathode. The lower potential of the anode in the corrosion cell releases electrons, M-ne → Mn+, resulting in corrosion at the anode while the cathode remains uncorrupted.
Using this principle, simply adding a sacrificial anode to the metal being protected makes the metal become the cathode, thus providing protection. In actual application, the placement of different sacrificial anode types depends on site conditions, typically on one side of the pipeline, but can also be on both sides. Anode burial sites should ideally be located in low-lying, humid terrain with thick soil and easy access. Each burial site constitutes a group, which can consist of 2-4 anodes.
Experts specializing in the research, development, and production of aluminum anode products believe that the actual application of sacrificial anodes is primarily reflected in the following aspects:
1. Saturated copper sulfate and high-purity zinc reference electrodes can be used in soil, while high-purity zinc and silver/silver chloride reference electrodes can be used in aqueous media.
2. Molybdenum dioxide reference electrodes are primarily used in concrete. The lifespan of saturated sulfuric acid reference electrodes is generally less than 10 years. Other reference electrodes can be designed based on their lifespan.
3. Sacrificial anode control electrodes primarily include long-life saturated copper sulfate reference electrodes, high-purity zinc reference electrodes, silver/silver chloride reference electrodes, and molybdenum dioxide reference electrodes.
