What can sodium sulphate break down into that contributes to condensate return corrosion?

Sodium sulphate can break down into hydrogen sulphide and sulphur dioxide under certain conditions, particularly in the presence of moisture and heat. These byproducts are critical in the context of condensate return systems because they can be extremely corrosive to metals.

When hydrogen sulphide is present in a condensate system, it can lead to issues such as pitting and general corrosion of steel and iron components due to its acidic nature. The presence of sulphur dioxide can also contribute to corrosion, as it can react with moisture to form sulfurous acid, exacerbating the corrosive environment. This reaction not only increases the risk of damage but can also result in significant maintenance issues and increased operational costs for a power plant.

In contrast, other compounds listed in the alternative choices do not directly link to condensate return corrosion in the same manner. Sodium and iron compounds generally refer to solid particulates rather than gaseous corrosion contributors, while carbon dioxide and nitrogen gas are relatively benign in terms of corrosion potential. Phosphates and silicates relate more to water treatment and scale formation rather than direct corrosive actions in a condensate return context.

Understanding the breakdown products of sodium sulphate and their implications is crucial for maintaining the integrity of condensate systems in