Steven Siepser Community Member 1 Post
Re: What causes corrosion from ethylene glycol?27 January 2014 at 8:00pmDear Colleagues, Ehtylene Glycol is the major component of the TKS solution used in-flight for de-icing airplanes in a continuous process of weeping out of the porous front surface of the airfoil. I also have noted that it is often in windshield de-icing solutions. What are the expert's comments on the corrosion effect of these solutions on plexiglass, painted and coated aluminum and metal components of aircraft?
Brian Dalder Community Member 180 Posts
Re: What causes corrosion from ethylene glycol?11 February 2014 at 1:43pm
I am not familiar with the technologies and fluids used for aircraft de-icing. However, if ethylene glycol is involved, I suspect it does not harm the aircraft components because of a combination of one or more of the following:
1) the temperature is not elevated (elevated temperatures can cause decomposition and acid formation in uninhibited ethylene glycol solutions)
2) the de-icing fluids contain corrosion inhibitors
3) the concentration of the de-icing agents is low and therefore does not induce corrosion
4) the de-icing solutions are already compatible at the concentrations and temperatures of interest
Regarding auto windshield wiper fluids, in addition to the above, most windshield wiper fluids are mixtures of water and methanol (and not ethylene glycol and water).