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As the most important anti-corrosion material in industrial production, magnesium anode not only has outstanding performance in application, but also has obvious characteristics. With the continuous expansion of the industry, more and more places use magnesium anode products. What protection effect does magnesium anode play in the application of water heater? How much do people know about the protection of magnesium anode?
Magnesium is a promising anode material for chemical power supply. Theoretically, magnesium can provide a relatively negative discharge potential and a larger specific capacity in the discharge process. However, in practice, some factors seriously affect the inherent excellent discharge performance of magnesium, such as the discharge products covered on the anode surface, hydrogen evolution side reaction and metal particles falling off.
The water heater is used for heating domestic and industrial water. According to the relevant market survey, stainless steel tank and enamel tank are the same in China's water heater market. As the enamel tank water heater is equipped with magnesium sacrificial anode for cathodic protection of the tank, which has good performance and life with low cost and high quality, it has won more and more markets and shows a strong development momentum. At present, the output of enamel tank water heater with magnesium cathode protection material produced in China is conservatively estimated to be about 1.5 million units per year, and it is growing at a very fast speed. It is estimated that production of 3 million units per year will soon be reached.
Magnesium anode installed in hot water storage tank is necessary to prevent corrosion of water heater. In practical use, due to the magnesium anode (voltage - 2.4V), the current in the hot water tank flows from the anode to other inert materials (with low potential). This will prevent corrosion of the hot water tank.
Therefore, the anode will have a loss after a period of time. The stronger the conductivity of water (hard water), the stronger the current, so the greater the loss of anode. The smaller the conductivity of water ("soft" water), the less strong the current, so the loss of anode is smaller, so it can not play a sufficient role in protecting the hot water storage tank, and the more likely it is to corrode it. The harder the water quality is, the greater the "natural protection" effect of water heater tank and devices will be.
Water heaters are used to heat domestic and industrial water, so they should be able to operate for a long time without changing the water quality, especially the quality of drinking water. In practice, different materials and corrosion protection methods can be used, but the technicality and economy of these methods must be considered. The corrosion of metals in water is an electrochemical process, during which the metal is oxidized into metal ions at the anode and another substance dissolved in the corrosion medium is reduced at the cathode. Usually, the material is oxygen.
When electrochemical corrosion protection is used in water corrosion system, the corrosion potential at the fastest corrosion rate must be within the limit range of protection potential. However, it should be remembered that the only effective magnesium anode cathodic protection rule is that no corrosion can be detected by visual inspection of the box surface.
Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing corrosion protection, cathodic protection, engineering design, installation and technical services.