Prevention of Corrosion — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Prevention of Corrosion.

Comparative analysis of metallic coatings under damage

high

NEET frequently tests the understanding of galvanization vs. tinning, especially what happens when the coating is scratched. This angle directly assesses the student's grasp of sacrificial vs. barrier protection and the role of relative reactivity. Future questions are likely to present scenarios where a coated metal is damaged and ask about the subsequent corrosion behavior, requiring a clear distinction between the two mechanisms. This is a classic conceptual differentiator.

Mechanism and application of corrosion inhibitors

medium

While inhibitors are covered, deeper questions distinguishing between anodic, cathodic, and mixed inhibitors, their specific chemical examples, and their precise mode of action (e.g., film formation, potential shift) could be explored. Questions might involve identifying the type of inhibitor from its chemical formula or predicting its effect on the corrosion process, including the dangers of underdosing anodic inhibitors. This tests a more nuanced understanding beyond basic definitions.

Role of standard electrode potentials in cathodic protection

high

The electrochemical series is fundamental to understanding sacrificial protection. Questions often provide standard electrode potentials and ask students to identify the most suitable sacrificial anode or predict the corrosion behavior of a galvanic couple. This angle directly tests the application of electrochemical principles to practical corrosion prevention scenarios, making it a strong candidate for NEET questions.

Passivation and its role in corrosion resistance of alloys

medium

The concept of passivation, particularly in stainless steel due to chromium, is a key aspect of corrosion prevention through alloying. Questions could delve into the nature of the passive film, conditions for its formation and breakdown, or compare the corrosion resistance of different alloys based on their passivation properties. This tests the understanding of how material composition influences corrosion behavior.