The corrosion problems and the corrosion inhibitors for boiler systems are explained. In a boiler system, with places, water quality differs and the form and measure of corrosion change. Conventionally, as for the corrosion inhibitors for boiler systems, hydrazine and sodium sulfite have been used. Recently, the chemicals that improved the fault of the conventional corrosion inhibitors are developed and used. They are improved oxygen scavengers or film forming type corrosion inhibitors. Improving points are the toxicity of chemical, workability, etc. Volatile amines are used as the corrosion inhibitor for a steam condensation system. Volatile amine is classified into three sorts, a neutralized type, a film forming type, and a hybrid type. The contents of new chemicals are described. From now on, effective treatment is expected with the combination of water treatment equipment and chemical.
