Chloride ion – corrosion activator and passivator
DOI:
https://doi.org/10.62638/ZasMat1516Abstract
Brass, an alloy of copper and zinc, is widely used in various industries due to its favorable mechanical properties, good machinability, and corrosion resistance in many environments. However, the presence of certain ions in the environment, particularly chloride ions (Cl-), can significantly affect the corrosion behaviour of this alloy. Chloride ions are known for their ability to disrupt passive layers on the surface of metals and alloys, which can lead to localized corrosion such as pitting and dezincification-selective removal of zinc from the alloy-that can severely compromise its structural integrity. In certain cases, chloride ions may also act as passivators of corrosion processes, depending on their concentration, the composition of the material being tested, and the pH-value of the solution. Therefore, understanding the mechanisms of brass corrosion in the presence of chloride ions is essential for its safe and long-term use, especially in water transport systems, sanitary uquipment, and the marine industry, where these ions are commonly present. This study investigates the factors influencing the intensityand ty pe of brass corrosion in chloride environments, with special emphasis on electrochemical testing methods and the morphology of corrosion products.
Keywords:
brass, corrosion, dezincification, chloride ionsReferences
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