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Master the Fundamentals of Cathodic Protection
Rating: 4.5 out of 5(35 ratings)
143 students

Master the Fundamentals of Cathodic Protection

A concise and complete course with all the key concepts to get started with cathodic protection
Created byCorroZone Ltd.
Last updated 12/2024
English

What you'll learn

  • Define cathodic protection (CP) and its role in preventing corrosion.
  • Understand the natural process of corrosion without CP.
  • Learn how external currents influence anodic and cathodic reactions.
  • Understand the role of electrolytes in carrying protective currents for CP.
  • Learn to measure potential and understand its relationship with current and corrosion rates.
  • Compare the principles and components of impressed current and sacrificial anode CP systems.
  • Understand the effect of IR drop on CP potential measurements.
  • Assess electrochemical reactions and environmental changes in CP systems.
  • Use Pourbaix diagrams to evaluate corrosion scenarios and CP conditions.
  • Learn criteria for designing and assessing CP systems to ensure adequate protection.
  • Identify and understand the problems associated with overprotection.
  • Examine the impact of IR drop on ON potential measurements in CP.
  • Learn the importance of OFF potential measurements for accurate CP assessment.
  • Understand current density distribution and potential profiles near structures and anodes.
  • Gain insight into the benefits and evaluation of remote anode placement.
  • Understand the effects of stray current corrosion on unconnected structures.
  • Learn about potential decay in CP systems and its implications.
  • Apply Faraday’s law to calculate anode material requirements for CP.
  • Understand factors affecting anode resistance and methods to reduce it.
  • Learn how coatings protect metal surfaces and influence CP current requirements.
  • Estimate CP current for structures using the current drain test.
  • Compare and design sacrificial anode and impressed current CP systems.

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Course content

4 sections • 26 lectures • 3h 14m total length

  • Introduction to Section 10:54
  • What is cathodic protection?3:52

    Learn how cathodic protection uses a cathodic current to shield structures. The electrolyte environment carries the current, enabling protection for immersed parts via the anode, cables, and power supply.

  • Free Corrosion11:49
  • Effect of applying a current to a corroding surface14:01

    External cathodic current reduces corrosion by suppressing iron oxidation as oxygen diffusion is overwhelmed, potentially eliminating corrosion when enough electrons reduce surface oxygen within an electrolyte.

  • Transport of electrical charge in the environments (electrolytes)4:28
  • Measuring potentials10:39

    Measure a structure's potential in an electrolyte with a reference electrode and voltmeter to reveal the corrosion potential and the balance of anodic and cathodic currents, guiding cathodic protection.

  • Cathodic protection systems9:10

    Apply cathodic protection by using sacrificial anodes or impressed current systems to protect structures from corrosion. Learn how current flow lowers the structure’s potential and raises the anode’s, reducing corrosion.

  • Section 1 Quiz.

Requirements

  • Basic understanding of corrosion concepts, such as oxidation and reduction reactions.
  • Basic understanding of basic chemical principles, such as chemical reactions.
  • Basic knowledge of electrical concepts, such as current, voltage, resistance, and circuits.

Description

The course offers a comprehensive overview of essential concepts for understanding and designing cathodic protection (CP) systems. It begins with the fundamentals, where learners will explore the basic mechanisms of CP, the role of electrolytes, and the components of sacrificial anodes and impressed current CP systems.

Learners will understand the impact of applied currents on corrosion, including how cathodic currents can prevent corrosion, and will learn how to measure a structure’s potential using reference electrodes and voltmeters. Practical considerations such as ohmic effects, electrochemical reactions near protected structures, the design and assessment of CP systems based on protection criteria, and avoiding overprotection are considered in detail. The course also discusses the origin of potential gradients in the environment, the distribution of current near the anode and near the structure, the benefits of remote anodes, the methods for evaluating uniform current distribution, and the issue of stray current corrosion. Topics like anode resistance, groundbed properties, current drain tests for estimating CP current, and the impact of coatings on CP current requirements are covered.

By the end of this course, learners will have a thorough understanding of fundamental concepts related to cathodic protection systems and the factors influencing their effectiveness in preventing corrosion, gaining the confidence needed to address specific cathodic protection problems.

Who this course is for:

  • This course is designed for a diverse range of learners who seek to understand and apply cathodic protection (CP) principles to prevent corrosion in various structures.
  • The course will be valuable for professionals specializing in corrosion control and prevention who wish to deepen their knowledge of CP, as well as for engineering students or scholars in the field of corrosion and protection looking to gain a foundational understanding of CP systems and their applications.
  • This course provides a thorough grounding in CP fundamentals, providing learners with the confidence and skills to independently tackle complex corrosion problems.

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