Should you use WD-40 on an airplane?
Corrosion Inhibiting Compounds (CIC’s) are used to coat load bearing structures of aircrafts and extend their service life, much like WD-40 and the hinges of your garage door.
While CIC’s offer substantial protection to the surface integrity of the metal, they can ingress on the faying surface causing a lubricative effect. Given the harsh conditions that airplanes have to withstand this additional lubrication can aggravate small movements causing premature failure.
In order to investigate the mechanical behaviour of CIC’s on aircraft joints, samples of single-shear lap joints were manufactured, corroded and fatigue tested until failure. By analysing new data, observations were made to outline the effect that CICs have on corrosion protection and fatigue.
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