Abstract
Three types of corrosion inhibitors consisting of sodium diphosphate (Na2H2P2O7), sodium benzoate (NaC7H5O2), and sodium tetraborate (Na2B4O7) were evaluated to analyze their effectiveness to inhibit the aluminum alloy 3303 (UNS A93303) against corrosion, in water-ethylene glycol (C2H6O2) mixture. Potentiodynamic polarization tests were carried out to study the effect of each chemical. The temperature of solutions was 88°C and the aluminum samples were coupled with five other metals consisting of mild steel, stainless steel, brass, copper, and solder to include the effect of galvanic corrosion. The results showed that sodium diphosphate can effectively protect the aluminum alloy 3303 in comparison with two other chemicals. The effect of thermal shocking on the corrosivity of water-ethylene glycol solution was also investigated. It was indicated that the corrosivity of water-ethylene glycol solution increases because of thermal shocking, which oxidizes the aqueous ethylene glycol. The corrosion rate of aluminum alloy 3303 coupled with the five metals in thermal shocked water-ethylene glycol solution is 142 mpy, while it is 94 mpy in fresh water-ethylene glycol solution.
Highlights
One of the main applications of aluminum alloy 3303 (UNS A93303) is in cooling systems of internal combustion engines as radiator, due to its lightness, high thermal conductivity, good corrosion resistance, and other interesting properties [1]
Sodium benzoate, and sodium tetraborate were prepared to be added in the water-ethylene glycol mixture with the concentration of 1 wt.% as corrosion inhibitors
Corrosion inhibitors are necessary to be added to the coolant in order to protect the metallic parts of the cooling system against corrosion
Summary
One of the main applications of aluminum alloy 3303 (UNS A93303) is in cooling systems of internal combustion engines as radiator, due to its lightness, high thermal conductivity, good corrosion resistance, and other interesting properties [1]. Corrosion is aggravated at the functional temperature of combustion engines, which usually elevates the temperature of the coolant to nearly the boiling point of water [6] This fact that different types of metals are galvanically coupled together in cooling systems is another source of promoting corrosion in these systems. Liu and Cheng studied the corrosion of automotive cooling system aluminum alloy in water-ethylene glycol solution in the presence of various ions [24] They reported that a layer of aluminum-alcohol film is produced on the metal, which can protect the aluminum alloy from corrosion against different ions, depending on the ethylene glycol concentration [24], their results were regardless of ethylene glycol decomposition due to thermal shocks
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