2nd Class Power Engineering 2A2 Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

How do cathodic inhibitors function?

By adding heat to increase reaction rates

By precipitating a thin layer on the metal surface

Cathodic inhibitors function primarily by precipitating a thin layer on the metal surface. This layer acts as a protective barrier and reduces the rate of corrosion by hindering the electrochemical reactions that occur during the corrosion process. When a cathodic inhibitor is introduced into a system, it interacts with the metal surface to form a film, which can consist of insoluble compounds. This film effectively blocks the access of corrosive agents, such as oxygen and moisture, to the metal, thereby slowing down the oxidation reactions that lead to corrosion.

The formation of this protective layer is critical in preventing further deterioration of the metal and prolonging its life in various industrial applications. The effectiveness of cathodic inhibitors illustrates the importance of surface chemistry in managing corrosion and ensuring the integrity of metal components in systems exposed to aggressive environments.

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By increasing the flow rate of the fluid

By reducing the pH of the process

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