Hydrazine (N2H4\text{N}_2\text{H}_4N2H4) is added to high-pressure steam systems in power stations to prevent the internal corrosion of iron-based alloy components. It reacts with dissolved oxygen according to the following equation:
N2H4+O2→N2+2H2O \text{N}_2\text{H}_4 + \text{O}_2 \rightarrow \text{N}_2 + 2\text{H}_2\text{O} N2H4+O2→N2+2H2OAlloy components exposed to untreated steam corrode significantly faster than identical components in steam treated with hydrazine.
Use the equation and your scientific knowledge to explain how hydrazine reduces the rate of corrosion of these iron-based alloy components.
Practise Edexcel GCSE Chemistry Transition metals, alloys and corrosion with exam-style questions for Foundation and Higher tier. 97 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
