engleski

VpCI for Multimetal Protection in Heating Systems

Carbon steel is a material often used in heating systems in civil buildings. It is generally susceptible to uniform corrosion in water but localized corrosion like pitting and crevice corrosion can also occur due to media contamination or local deposits on the pipeline walls. Stagnant water in the system, especially during the period when the heating system is not working, can be very detrimental for materials and can further accelerate corrosion. One method of corrosion protection of heating systems is to add vapor phase corrosion inhibitors (VpCI) to the media, considering that the system often consists of fittings and valves made of more noble metals like copper and copper alloys. This paper investigates the protective performance of vapor phase corrosion inhibitors for the reduction of corrosion in heating systems. In order to evaluate corrosion inhibiting performance and to determine the optimal product concentration at room and elevated temperatures, electrochemical polarization techniques including open circuit potential, polarization resistance and Tafel extrapolation were utilized. The optimal concentration of corrosion inhibitor was determined for efficient corrosion protection of all tested materials including carbon steel, aluminium, and copper parts, which are the main metal components in the tested heating system.

heating system ; multimetal components ; media ; vapor phase corrosion inhibitor

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