Why Metals Rust: The Chemistry of Corrosion and How We Prevent It (Parent Q&A)

This guide helps parents support learners aged 11 to 16 with the chemistry of corrosion and rusting. It explains why ordinary rusting needs iron, oxygen and water, how local electrochemical reactions form porous rust, and why salt, acids and contact between different metals can increase corrosion. It also compares protective coatings, galvanising, passivation and cathodic protection, with practical investigation ideas and safety guidance.