Cathodic Disbondment | Hidden Dangers of Cathodic Protection

Vanessa Sealy-Fisher and Neil Webb chat about if there is such thing as too much of a good thing in this session of our Bite-Sized Corrosion series on the Hidden Dangers of Cathodic Protection.
Complete with photographs and anecdotes, Neil and Vanessa unbury the questions around Cathodic Disbondment that many engineers have.
Nace Standard referred to: NACE TM0115-2022 Cathodic Disbondment Test for Coated Steel Structures under Cathodic Protection
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🎯 Key Takeaways for quick navigation:
00:32 Too *much cathodic protection can impact the external coating of buried pipelines, posing risks.*
01:53 The *upper limit of cathodic protection magnitude is recognized as -1200 millivolts, crucial to prevent coating damage.*
03:00 Understanding *the electrochemical interaction at the cathode is essential in discussing cathodic protection.*
07:20 Uncontrolled *cathodic protection potentials can lead to coating blistering, emphasizing the coating's critical formulation.*
09:23 Cathodic *disbondment tests, like the cathodic desponding test, evaluate coating resistance to cathodic protection effects.*
14:16 Coating *application errors, even with compatible coatings, can result in adhesion loss and coating failure.*
18:15 Modern *coatings, though effective, pose challenges in controlling cathodic protection current, requiring careful system management.*
19:49 Incorporating *sacrificial anode systems with long operating lives is a practical solution for controlling cathodic protection.*
21:55 Strategic *placement and design of coupons are crucial for accurately monitoring cathodic protection systems.*
23:42 Interference *currents pose hidden dangers in cathodic protection, requiring careful system design and monitoring.*
24:33 In *the next session, the discussion will delve into the risks associated with interference and continuity in cathodic protection.*
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