Paper format. National Exams, May 2015 — 10-Met-A7, Corrosion and Oxidation. Three hours, closed book, approved Casio/Sharp calculator only. Six questions of 20 marks each; the rubric states that five of the six constitute a complete paper (100 marks). All six are answered below. The rubric also notes that several questions require descriptions of types of corrosion and engineering solutions, and that clarity and organisation of the answer are marked — the essay answers below are written as structured prose for that reason.
Reference texts. The answers below are keyed to the works normally recommended for this syllabus code:
- M. G. Fontana, Corrosion Engineering, 3rd ed. — electrochemical corrosion theory, polarization and passivity (Ch. 6), forms of corrosion: galvanic, crevice, pitting, intergranular, stress corrosion cracking (Ch. 3), cathodic and anodic protection (Ch. 4–9).
- D. A. Jones, Principles and Prevention of Corrosion, 2nd ed. — thermodynamics and the Nernst equation (Ch. 2–3), kinetics and polarization diagrams (Ch. 4), environmental cracking and corrosion fatigue (Ch. 10–11), coatings and cathodic protection (Ch. 13–14).
- W. D. Callister and D. G. Rethwisch, Materials Science and Engineering: An Introduction, 10th ed. — corrosion and degradation of materials (Ch. 17).
- ASM Handbook, Vol. 13A (Corrosion: Fundamentals, Testing, and Protection) — forms of corrosion, coatings and cathodic protection practice.
- NACE SP0169 (buried pipeline cathodic protection) and NACE/AMPP standards on impressed-current and sacrificial-anode design, cited where relevant to Question 6(b).
