Corrosion is a major hidden danger in the full operation of gas fired central heating boilers, and its harmfulness has been widely recognized, thereby enhancing people's awareness of corrosion prevention, promoting the implementation of anti-corrosion measures for gas fired central heating boilers, and achieving certain results. However, it should be emphasized that corrosion does not only occur during the operation of gas fired central heating boilers. During the shutdown period of gas fired central heating boilers, if appropriate protective measures are not taken, the oxygen entering the gas fired central heating boiler will cause corrosion on the damp metal surface. The harm caused by this corrosion during shutdown to gas fired central heating boilers is often much more severe than that during operation. Therefore, We must attach great importance to it.
 

1、 The corrosion surface is wide and the amount of corrosion products (iron oxide) is large. After the gas central heating boiler is shut down and the boiler water is discharged, the humidity inside the boiler or furnace is high, and the ventilation is poor. If it is in a humid state for a long time, due to the large amount of air entering, oxygen absorption corrosion may occur in all parts involved in the air. Moreover, due to the corrosion forms mainly being ulcer type and spot corrosion, a large amount of Fe2O3 and Fe (OH) 3 rust is generated. Therefore, stopping corrosion will cause the metal wall to become thinner, the strength to decrease, and shorten the service life of gas fired central heating boilers.

2、 Intensify corrosion during the operation of gas fired central heating boilers, resulting in a vicious cycle of corrosion. When the gas-fired central heating boiler is out of service, iron is corroded to generate high valent iron Fe2O3 and Fe (OH) 3. These iron oxides become substitutes for oxygen when the gas-fired heating boiler is operating, and are cathodic depolarization agents for corrosive batteries, that is, Fe (OH) 3 e → Fe (OH) 2 OH - and Fe2O3 2e H2O → FeO 2OH - react at the cathode, so that the high valent iron is reduced to low valent iron, and the result is that the iron used as anode is corroded, that is, Fe → Fe 2e. At the same time, when high valent iron oxide is reduced to magnetic iron oxide, it also releases oxygen, namely 6Fe2O3 → Fe3O4 O2 ↑, which increases the oxygen content in the water. Due to the large amount of iron oxide generated during the shutdown of corrosion and the wide corrosion surface, the corrosion of iron generated during the operation of gas fired central heating boilers is also very serious. When the gas centralized heating boiler is once again shut down, the reduced low valent iron is oxidized back into high valent iron, which generates strong oxygen concentration corrosion under rust, further corroding the iron under rust and producing a large amount of new iron oxide. When the gas central heating boiler is operated again, the above-mentioned iron oxide reacts with the cathode, causing more severe corrosion in the gas central heating boiler.

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