Which of the following is NOT a potential hazard from improper filling of an enriched air cylinder?

Corrosion is indeed not a direct potential hazard from the improper filling of an enriched air cylinder. When enriched air is filled into a cylinder, the main concerns typically revolve around the composition of the gas and the pressures involved.

Fire hazards can arise due to the higher concentrations of oxygen in enriched air, which can make materials that are normally non-flammable ignite more easily. Similarly, improper filling can lead to explosions due to factors like over-pressurization or mishandling compressed gases. Oxygen toxicity is another critical concern since elevated levels of oxygen can lead to harmful physiological effects if divers exceed exposure limits while diving with enriched air.

Corrosion, on the other hand, is often related to the interaction of corrosive substances with materials over time, and while maintaining cylinders properly is crucial to prevent corrosion, the act of simply filling a cylinder with enriched air in itself is not directly hazardous in terms of immediate risk from corrosion. This distinction highlights the nature of risks associated with proper handling and filling practices in diving.