Abstract
This paper deals with some examples of application of methods for monitoring of corrosion of metals to engine cooling systems. In service tests of a simulated automobile cooling system linear polarization methods in-situ were applied to the measurements of corrosion rates of aluminum specimens and aluminum water pumps immersed in inhibited ethylenglycol coolant under operating conditions. It was found that rates of corrosion of Al estimated from the polarization measurements correlated well with the actual weight losses. Periodic linear polarization measurements made in service tests continued for 7 months (running distance: 11, 300kms) under cooling conditions similar to practical ones showed that the estimated corrosion rates of the aluminum were in a good agreement with the average corrosion rate calculated from the weight losses of aluminum specimens removed from the test cars. The linear polarization resistance method for monitoring of corrosion of metals in diesel locomotive cooling system and an electronic sensor for detecting of the corrosivity of automobile antifreezing coolants are also described.
