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Combined with the background related to the electrochemical protection of heat exchangers mentioned earlier, in addition to anode protection, there are also the following mainstream anti-corrosion solutions: 1. Principle of cathodic protection method: By adding an external DC power supply or a sacrificial anode, the entire metal surface is turned into a cathode to inhibit the anode dissolution reaction. Features: It is suitable for conductive media such as seawater and circulating water. It is often used with coatings and has protection limitations only in the limited area of the pipe inlet. 2. Principle of selecting corrosion-resistant materials: Starting from the equipment body, the heat exchange components are directly made of high corrosion-resistant materials. Features: Duplex stainless steel, Hastelloy, titanium alloy, fluoroplastics, etc. are available. 65% of companies will choose fluoroplastics, which are more expensive but have long-lasting anti-corrosion effects. 3. Principle of anti-corrosion coating method: Coat an anti-corrosion layer on the metal surface to isolate the corrosive medium from contact with the substrate. Features: Economical and efficient, polymer materials such as Fuslan 418 and EE-111 can be used, which are suitable for high temperature and strong corrosion conditions and are convenient for on-site construction. 4. Principle of adding corrosion inhibitor method: Adding a small amount of corrosion inhibitor to corrosive media can significantly reduce the metal corrosion rate. Features: The addition amount needs to be controlled so as not to affect the production process and product quality, and is suitable for scenarios such as ethylene glycol circulating water. 5. Principles of other auxiliary process measures: Reduce the risk of corrosion by optimizing operations and maintenance. Features: Control the pH value of the medium, avoid over-temperature and over-flow operation, and regularly carry out backwashing or chemical cleaning to reduce scaling and microbial corrosion.