You are currently viewing Important Facts: Quiz on Corrosion Protection of Pipelines II 7 MCQs with Explanations

Important Facts: Quiz on Corrosion Protection of Pipelines II 7 MCQs with Explanations

Cathodic Protection Quiz

1. Types of CP Systems under Corrosion Protection of Pipelines

What is the main difference between sacrificial anode CP and impressed current CP w.r.t. Corrosion Protection of Pipelines?

2. How CP Works

How does CP prevent corrosion of a metal surface?

3. Factors Affecting CP

What are some factors that can affect the effectiveness of CP?

4. Benefits of CP

What are some benefits of cathodic protection for steel pipelines?

5. Summary of CP

What is a key takeaway about cathodic protection from the summary?

6. CP Application

When is impressed current CP typically used?

7. CP Technique

How does CP shift the potential of the steel pipeline to prevent corrosion?

Short Article on Corrosion Protection of Pipelines

Cathodic protection (CP) is a technique used to prevent corrosion of a metal surface by making it the cathode of an electrochemical cell. The most common application of CP is in the protection of steel pipelines.

Types of Cathodic Protection

There are two main types of CP systems:

  • Sacrificial anode CP: This system uses a more active metal, such as zinc or magnesium, as the anode. The anode corrodes preferentially, protecting the steel pipeline.
  • Impressed current CP (ICCP): This system uses an external power source to impress a direct current onto the pipeline, making it the cathode. ICCP is typically used for larger pipelines or pipelines in highly corrosive environments.

How CP Works

CP works by shifting the potential of the steel pipeline to a more negative value. This makes the pipeline less likely to corrode. The potential of a metal is determined by its position in the galvanic series. The galvanic series is a list of metals arranged in order of their reactivity. Metals that are higher on the galvanic series are more reactive and will corrode preferentially to metals that are lower on the series.

Factors Affecting CP

The effectiveness of CP depends on a number of factors, including the type of CP system, the size of the pipeline, the soil conditions, and the presence of stray currents.

Benefits of CP

CP is a very effective way to protect steel pipelines from corrosion. It can extend the life of a pipeline by many years and can also prevent leaks and spills.


CP is a critical part of pipeline corrosion control. It is a cost-effective way to protect pipelines from corrosion and can extend their lifespan.

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