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The factors affecting boiler corrosion are as follows:
1. The influence of the pH value of the boiler water
The pH of the furnace water affects the stability of the magnetite protective film. At room temperature, the pH of the boiler water is 11-12, and the corrosion reaction of the boiler is the lowest. At low pH, the oxide film cannot be formed due to the release of hydrogen ions. When PH>12, the magnetite film becomes thick due to the diffusion of ions, and thus causes damage. When PH>14, the rate of caustic erosion of the metal surface will increase rapidly. Therefore, it is very important to maintain the correct alkalinity.
2. Effect of dissolved oxygen
Most of it is caused by dissolved oxygen in the feed water, and its reaction formula is:
3Fe+2O2+H2O=Fe2O3+Fe(OH)2
When it occurs, the pressure is large, so most of the pitting occurs, which has a great impact on the life of the boiler itself.
3. Effect of local concentration of salt
A layer of membrane formed next to the heat transfer surface of the furnace water may produce locally high concentrations of salts. Local high concentration of caustic soda may lead to an increase in corrosion rate. Hydrogen oxide ions will concentrate between the porous deposit and the surface of the tube metal to form a typical alkali etch, and the excessively concentrated alkali will dissolve the magnetic The iron ore protective film exposes the furnace tube to a high concentration of alkali liquid. When the local alkali is too high, hydrogen gas is released, resulting in deep and wide gully corrosion on the surface of the iron.
4. Condensation pipeline corrosion
The alkalinity (H2CO3) in the boiler water is heated to generate CO2 volatilization in the steam line, and once the steam is condensed and H2O3 is formed into H2O, the PH value is low, which causes the quality of the condensed return water to decrease, thereby affecting the life of the boiler itself.
Xinpei Environmental Research and Development SP-800 series boiler water treatment chemicals such as gas phase corrosion inhibitors, tank deoxidizers, etc. can effectively solve the corrosion problems caused by the boiler water system, and also provide boiler cleaning and shutdown maintenance services, if relevant The questions or needs are welcome to call us to discuss!
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn