GATE Physical Metallurgy: Corrosion – Previous Year Questions

6 GATE previous year questions on Corrosion (Physical Metallurgy, Metallurgical Engineering) with answers and explanations, from every paper.

GATE 2021 MT Q62 (2 marks, Numerical answer) – At 25 °C, iron corrodes in deaerated pH-3 acid with corrosion current density 4 μA/cm2. Its corrosion potential is V (two decimal places). Given…
GATE 2021 MT Q64 (2 marks, Numerical answer) – Nickel oxidizes isothermally at 800 K for 400 s, gaining 2 mg/cm2. Its weight gain after 1600 s is mg/cm2 (nearest integer). Assume gain proportional…
GATE 2023 MT Q53 (2 marks, Multiple select) – Choose the correct statement(s) in the context of fusion welding of austenitic stainless steel containing about 0.06 wt.% carbon.
GATE 2024 MT Q42 (2 marks, Multiple choice) – A quenched steel is tempered for the same time at T 1<T 2<T 3, giving the shown microstructures. Black circles are cementite in ferrite; r 1, r 2, r 3…
GATE 2024 MT Q62 (2 marks, Numerical answer) – A mild-steel pipeline is cathodically protected using zinc at current density 10 mA m-2. Zinc required per square meter per year is g (nearest…
GATE 2026 MT Q31 (1 mark, Multiple select) – Which of the following elements, when present in iron, enhance(s) its corrosion resistance?