Erosion-corrosion damages of water-pump impeller |
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Authors: | D -I Lee H -C Lim |
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Institution: | (1) Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6R 1Z1, Canada |
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Abstract: | A steel impeller placed in a water pump has been studied with the aim of understanding the surface erosion-corrosion phenomena
responsible for reducing the pumping efficiency of water inside the cooling system. This experiment includes long-term (over
about half a year) observations with a powered microscope and precise weight measurements. The experiments were carried out
under different conditions of water using several mixtures of water and coolants with water contents of 25%, 50%, 75%, and
100% (i.e., pure tap water). The visual microscopy results reveal that most of the steel surface is pitted and clearly rusty, such that
corrosion phenomena are noticeable as time passes. In addition, the amount of weight lost from the sample specimens submerged
in static water increased linearly, whereas those placed in mixtures of water and coolant initially gained weight before reaching
an almost constant weight. In order to see the dynamic effect of the impeller on the erosion-corrosion phenomena, surface
observations of the steel impeller were also made at each time after suitable running conditions in water and water-coolant
mixtures, namely around 3∼4 hours of operation per day under changing rotation speeds. The results show that the rate of weight
loss was linear and 2∼3 times higher than the impeller in water under both static and dynamic conditions. However, when the
impeller was submerged in the mixtures, the weight loss was initially insignificant due to the corrosion-proof ingredients
of the coolant, but after around 2 months the weight loss substantially increased and gradually approached a linear curve. |
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