Cathodic Protection Design for Steel in Concrete Structures

Module D6 – Structural Exposure Condition

Welcome to Module D6! Environmental exposure changes everything in electrochemical engineering. 

A cathodic protection (CP) design that works perfectly on a dry highway bridge will completely fail if applied blindly to a marine jetty or a buried foundation pile. The surrounding environment completely dictates your electrolyte path, your anode selection, and the physical limits of your protective current.

This module cuts through the academic complexity of varying exposure zones to give you actionable, field-ready design rules. You will learn how to identify shifting concrete resistivity across different zones, prevent high-risk system failures like current dumping, and implement exact wiring configurations for both Galvanic and Impressed Current Cathodic Protection (ICCP) networks.

What You Will Learn

  • Exposure Matrix & Anode Selection: Understand how environmental zones (atmospheric, splash-spray, tidal, buried, and immersed) control where and how anodes must be installed.


  • The Splash Zone "Current Dumping" Risk: Discover why intermittently wet and dry splash/spray zones require completely independent anode setups to counteract low concrete resistivity.


  • Buried & Immersed Boundary Limits: Understand how soil or water serves as your primary electrolyte, and why protection is strictly capped at the highest water or soil line.


  • Bare Surface Requirements: Learn why buried or underwater concrete surfaces must remain bare and free from isolating coatings or waterproofing membranes to allow ionic current to pass.


  • Atmospheric Anode Configurations: Master the installation of surface-applied systems (like galvanic foils with conductive gels or titanium mesh and overlays) and embedded systems (like titanium ribbons and discrete ICCP or galvanic anodes).


  • Wiring & Energy Movement Diagrams: Understand positive and negative cable connection layouts for self-powered galvanic alloys and external AC/DC ICCP power supply units.


  • Multi-Standard Compliance Auditing: Ground your work and reference international benchmarks, aligning your design details with BS EN ISO 12696, BS EN 12496, and BS EN ISO 13174.

Who This Course Is For

This curriculum adapts smoothly to your current career tier, ensuring immediate field utility.

  • Junior Engineers & Field Techs: Industry newcomers who need to understand why metallic structures rely on barrier coatings while concrete structures require embedded or surface-applied anodes to pass current.


  • Project Leads & Design Consultants: Engineers transitioning into marine, coastal, or underground infrastructure projects who must accurately specify and understand the requirements for buried or immersed anode systems.


  • Senior Specialists & Technical Directors: Experienced practitioners calculating practical anode capacity, mapping utilisation efficiency, and accounting for self-corrosion or pore-blocking risks.


  • Asset Owners & Infrastructure Managers: Stakeholders managing port authorities, coastal highways, or water treatment plants who want to understand why intermittent tidal exposures require a combined coating and CP strategy.

Course Delivery & Requirements

To maintain strict compliance and ensure professional-level mastery, this course utilises an integrated learning framework:

  • On-Demand Video Lessons: High-yield video walkthroughs of real-world marine pile installations, overlay methods, and structural zone schematics.


  • Technical Document Downloads: Complete access to downloadable slides (PDF) and the module overview (PDF) for offline reference.


  • Direct Expert Q&A: Submit technical questions directly through the online learning platform to John Paul Segers (MSc, CEng, FICorr, FIMMM, BS EN ISO 15257 Level 5 CP Expert).


  • Progression Gate: Learners must complete all video lessons, review all documentation, and pass the integrated assessment before unlocking subsequent modules.


  • 100% Mastery Criteria: Achieving a perfect score of 100% on the final 15-question module quiz is required to proceed.


  • Members have access to the On-Demand Video Lessons and Quiz for 1 year from the date of registration, and complete access to downloadable slides (PDF) and the module overview (PDF) for offline reference.

Course Structure and Content

This element of the course has been extracted from the complete Fundamentals of Design for Cathodic Protection of Steel in Concrete Structures course as follows:

    1. Welcome and Course Overview - Video

    2. Purchasing Cathodic Protection Standards - Video

    1. Module D6 -Structural Exposure Condition - Overview

    2. Module D6 - Structural Exposure Condition - Video

    3. Module D6 - Structural Exposure Condition - Slides

    4. Module D6 - Structural Exposure Condition - Quiz

About this course

  • £95.00
  • 6 lessons
  • 0.5 hours of video content

Module D6 - Learning Outcomes

At the end of this module, you will have developed an understanding of :

  • Structural exposure conditions for cathodic protection of steel in concrete. 
  • The effect of structural exposure on anode selection for cathodic protection of steel in concrete.
  • The effectiveness of cathodic protection on metallic and steel in concrete structures.
  • Limitations of cathodic protection for buried and immersed reinforced concrete structures. 
  • Galvanic cathodic protection of buried and immersed steel in concrete.
  • Impressed current cathodic protection of buried and immersed steel in concrete.
  • Standards for buried or immersed CP anodes for cathodic protection of steel in concrete. 
  • Limitations of cathodic protection for atmospherically exposed reinforced concrete structures. 
  • Galvanic cathodic protection of atmospherically exposed steel in concrete.
  • Impressed current cathodic protection of atmospherically exposed steel in concrete.
  • Standards for atmospherically exposed CP anodes for cathodic protection of steel in concrete. 
  • Additional information required for galvanic cathodic protection of atmospherically exposed steel in concrete design.


Module Quiz

At the end of this module, there is a quiz consisting of 15 questions that are aimed at reinforcing the learning and knowledge you have gained from attending this module. 

Frequently Asked Questions (FAQ)

  • Why can't a single, continuous atmospheric anode zone extend down into a splash or spray zone?

    Splash and spray zones are intermittently wet, which significantly lowers the local concrete resistivity. If your anode zone crosses this boundary continuously, the current will take the path of least resistance and dump entirely into the wet area. This leaves the dry, upper atmospheric concrete completely unprotected and quickly burns out your lower anodes.

  • What are the physical limitations of protecting buried or immersed concrete structures?

    Cathodic protection current can only travel through an active, continuous electrolyte. Because of this, external soil or water anodes are only effective up to the highest water or soil level. Furthermore, if the concrete surface has been wrapped in an isolating waterproofing membrane or non-conductive cosmetic coating, the current path is blocked entirely.

  • How does the role of cathodic protection differ between metallic structures and reinforced concrete in atmospheric zones?

    Fully metallic structures in atmospheric zones cannot use cathodic protection because they lack a continuous external electrolyte to carry current. Instead, they depend entirely on the barrier effects of protective coating systems to prevent rust. Reinforced concrete structures can successfully utilise atmospheric CP because the concrete matrix itself serves as the bulk electrolyte, allowing embedded or surface-applied anodes to pass current directly to the steel.

  • What specific data is required from suppliers when designing a galvanic system for atmospherically exposed concrete?

    To comply with international design standards like BS EN ISO 12696, you cannot rely solely on the theoretical capacity of the anode alloy. You must secure four critical pieces of data from the manufacturer: the exact chemical composition (typically high-purity zinc), the anode mass per unit area, the physical dimensions (to calculate circuit resistance and current output), and verified utilisation and efficiency rates. This allows you to accurately account for long-term performance losses caused by natural self-corrosion and concrete pore blocking.

Module D6 - Structural Exposure Condition

Module D6 is the seventh of ten modules which form the complete Fundamentals of Design for Cathodic Protection of Steel in Concrete Structures course.

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Continue with your Learning and Personal Development

Individual modules do NOT provide CPD hours. To unlock your 50-Hour Certified CPD Certificate, you must complete all 10 modules.

Module D6 is the seventh of ten modules which form the complete Fundamentals of Design for Cathodic Protection of Steel in Concrete Structures course.

Completion of all modules of the full Fundamentals of Design for Cathodic Protection of Steel in Concrete Structures course provides you with a Continued Professional Development (CPD) completion certificate worth 50 hours.

I encourage you to continue with your learning and personal development to help identify that corrosion management can be used as an effective tool to support sustainable and low-carbon development now and in the future.