13. Outline (with the aid of any diagrams as appropriate) the principles of protecting metals from the effects of corrosion by electrochemical means.
13. Outline (with the aid of any diagrams as appropriate) the principles of protecting metals from the effects of corrosion by electrochemical means.
14. Describe the phenomenon of creep in metals. Referring to the features of a graph of strain versus time, outline the general creep characteristics,
15.For minimising (1) dislocation creep and (ii) diffusion creep, state in each case whether a metal with a small grain size or a large grain size would be the most suitable, giving reasons for your answers.
16. Outline (with the aid of any diagrams as appropriate) the use of plasticisers and stabilisers in polymeric materials.
17. By referring to the general characteristics of stress-strain plots of PMMA (perspex), explain how and why viscoelasticity influences fast and slow rates of load application.
18. Explain, with sketched examples, the principles of designing injection-moulded polymer products to minimise sink marks.
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