Evaluation of inhibitor efficiency on corrosion of the aluminium heart exchangers and radiators in central heating

Introduction of high technology in the central heating industry has been accompanied with new corrosion problem in connection with the modern concepts such as the condensation and with the choice of materials such as aluminium for the heart exchangers (boilers and radiators) and polymers (hearting floors). We describe the new corrosion inhibitor specifically designed to protect the central heating circuits in those more demanding conditions, particularly when aluminium is present. The mode of action against electrochemical corrosion, pitting corrosion, flow-induced corrosion, acid corrosion, alkaline corrosion and oxygen permeation are demonstrated from a complete set of experimental results/electrochemical measurements, gravimetric tests and XPS surface analysis. The depletion of the organic and inorganic components has also been followed in 100 real installations treated to follow the behavior as a function of time.