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Corrosion inhibitors used for boiler shutdown protection generally have good volatility, which is why this method is also known as the vapor-phase corrosion inhibitor method. The main corrosion inhibitors include inorganic ammonium salts such as ammonium carbonate, ammonium bicarbonate, and diammonium hydrogen phosphate, organic amines such as cyclohexylamine carbonate and benzoic acid, as well as the composite TH901 corrosion inhibitor. The characteristic of such corrosion inhibitors is that they are volatile and can generate a certain vapor pressure ； It can form a protective film on metal surfaces, offering strong corrosion resistance ； There is no high requirement for the dryness of the metal surface; in particular, the TH901 corrosion inhibitor also provides good anti-corrosion protection on wet metal surfaces. Usage: After draining the water from the boiler, remove any scale or deposits. Add the chemical to the boiler in the correct proportion and distribute it evenly throughout. Then close all valves to ensure a tight seal of the system. It should be noted that most of these corrosion inhibitors release ammonia vapor, which can erode copper components. Therefore, all copper components in the boiler’s steam and water system should be removed or sealed off ； Alternatively, a mixed corrosion inhibitor using benzotriazole and cyclohexylamine carbonate in a ratio of 3:2:7 (by mass) can be used to prevent corrosion of copper components.