Which chemical is commonly used to inhibit embrittlement in boilers?

Sodium nitrate is commonly used in boiler systems to inhibit embrittlement, particularly in high-temperature applications. It acts as an oxygen scavenger, helping to minimize the formation of corrosive components within the boiler water and steam systems. By controlling the chemistry of the boiler water, sodium nitrate reduces the potential for the formation of oxides that can lead to embrittlement of the metal components in the boiler.

In addition to its role in preventing embrittlement, sodium nitrate contributes to the overall water quality in the boiler, enhancing the effectiveness of other treatment chemicals and maintaining a stable pH level. It is particularly beneficial in closed loop systems and can aid in protecting against both corrosion and scaling.

Other chemicals listed do not serve the same function as sodium nitrate. While they may have their own roles in water treatment, they do not specifically target the prevention of embrittlement in boiler systems to the same extent.