Inconel 625 in wet chlorine and chloride solutions
1.Resistance to wet chlorine and chloride solutions
Inconel 625 has good to excellent resistance to wet chlorine and many chloride-containing solutions under moderate conditions. Its high nickel content provides resistance to chloride-induced stress corrosion cracking (SCC), and the chromium and molybdenum contents enhance resistance to pitting and crevice corrosion.
However, in strongly oxidizing, acidic chloride environments (e.g., concentrated ferric chloride, cupric chloride, or wet chlorine at high temperatures with high chloride concentrations), localized corrosion (pitting/crevice) or SCC may still occur, especially in the presence of oxygen, oxidizing ions, or high temperatures. Therefore, it is generally suitable for many wet chlorine and chloride service environments but should be evaluated case-by-case based on temperature, concentration, and oxidizing strength.
2.Corrosion resistance in alkaline solutions (e.g., sodium hydroxide)
Inconel 625 exhibits excellent resistance to most alkaline solutions, including sodium hydroxide (NaOH), over a wide range of concentrations and temperatures. It is highly resistant to general corrosion in NaOH, even at elevated temperatures, and is not prone to SCC in alkaline media.At very high concentrations and temperatures (e.g., near-boiling concentrated NaOH), the corrosion rate may increase slightly, but it typically remains acceptable for many industrial applications. Overall, Inconel 625 is considered a reliable material for caustic service (NaOH) under most conditions.
