INDICATORS OF CORROSION RESISTANCE OF EQUIPMENT IN VARIOUS AGGRESSIVE ENVIRONMENTS
Ключевые слова:corrosion rate, carbon dioxide compositions, corrosion indicators, carbonate scale deposits
The aggressiveness of the coolant composition is caused by various carbon dioxide -based components, such as CO2, H2CO3, HCO3-, CO32-, OH-, H+, Na+, K+, Mg2+, Ca2+, Cl-, SO42-, as well as a soluble oxygen molecule and slightly soluble hydrogen sulphide. Such a composition of the coolant, taking into account the indicated ions that are in a dissolved state, it can be said with confidence, is capable of forming and depositing a corrosive composition in the form of scale on the inner surface of pipelines that prevents the free passage of the coolant. Due to the occurrence of electrochemical processes, OH-, Mg2+, Ca2+, Fe2+ products formed near the metal surface of the pipeline are capable of forming and depositing a significant amount of corrosive carbonate sediment on the inner surface of the pipe, causing significant corrosion of the steel surface of the pipeline. Carbonate sediment significantly complicates the passage of the coolant through pipes in heat supply systems.