Episode 35 · Engineering Deep Dives
Corrosion Science: Why Steel Goes Home
Corrosion is an electrochemical process that becomes an integrity problem over years of operation. Begin with the small batteries that form on wet steel, then connect Faraday's law, polarization measurements and potential diagrams to practical assessment. Materials selection, corrosion allowance and monitoring turn those ideas into engineering decisions. The episode also examines data and digital models, asking how an integrity team can distinguish a useful signal from a reassuring dashboard.
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Inside this episode
- Cold open: the pig that came back with bad news
- Steel wants to go home
- The battery on every wet surface
- How fast: Faraday's law and the currency of corrosion
- Listening to the battery: polarization, Tafel lines and LPR
- Potential, and Pourbaix's maps of fate
- 1824: Humphry Davy and the copper hulls
- Inside the pipe: carbon dioxide and sweet corrosion
- Hydrogen sulfide: the sour side
- Under the microscope: oxygen, bacteria, and erosion
- The water problem and flow regimes
- Fighting from the inside: inhibitors, pigging and chemistry
- The outside of the pipe: coatings first
- Cathodic protection: pushing electrons in
- When protection fails: shielding, stray current and overprotection
- Seeing through steel: inline inspection
- How fast is it growing? Matching runs and growth rates
- Will it burst? Fitness for service in words
- Carlsbad, New Mexico, August 2000
- Prudhoe Bay, March 2006
- Integrity management: from firefighting to a system
- Data, digital twins and the integrity engineer's dashboard
- Choosing materials: carbon steel, corrosion allowance and alloys
- The decision
- Epilogue: the slowest emergency
Production credits & AI disclosure
Scripts generated with Claude Opus. Synthetic narration generated with Edge TTS. Reviewed, listened to, and approved by Sankalp Thakur.