Final answer:
A lightning protection system is bonded to the blade surface to protect it from lightning strikes.
Step-by-step explanation:
The material bonded to the blade surface to protect the blade in the event of a lightning strike is called a lightning protection system (LPS) or lightning conductor. These systems are designed to provide a low-resistance path for the lightning current to follow, diverting it away from the blade and preventing damage. The lightning protection system typically consists of metallic conductors and grounding electrodes.