Rusting - DM
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (8 张)
What is needed for rusting
water and oxygen and iron
What colour is rust and what does this suggest
orange/brown so Fe³⁺ is present
How does rusting occur
see photos (must know all)
3 main things to prevent rusting
sacrificial protection, galvanising, barrier protection
Sacrificial protection for rusting definition
using a more reactive metal (often in lumps) with a more negative E^θ value. The more reactive metal is preferably oxidised
Galvanising for rusting definition
thin layer of zinc over the metal which forms zinc oxide. If scratched the zinc reacts in preference to iron
Barrier protection for rusting definition
stops oxygen and water reaching the surface of the metal - plastic paint
Why is rusting worse near the sea
as NaCl (aq) increases conductivity of water so better flow of ions (sort of salt bridge)