21. Zinc and a comparison of painting, galvanizing, and metalizing (Feat. Kristen Blankenship)

It's taken for granted in the corrosion industry that zinc protects steel. But there's more than one way to put zinc on steel and more than one mechanism at work that makes it so protective. Kristen Blankenship returns to The Red Bucket to answer some big questions with even bigger implications: 

• What's zinc actually doing on painted, galvanized, and metalized surfaces? 
• How do these corrosion protection methods compare in terms of performance? 
• Does the standard "zinc-epoxy-urethane" coating system hold zinc-rich primers back from performing as well as they could on their own? 
• How many ISO 12944-9 testing cycles will it take before any corrosion appears on panels coated in a two-coat inorganic system? 

Kristen also contemplates the deathbed of a lonely scientist. 

• 00:00 – Intro 
• 02:13 – A very brief history of cathodic protection 
• 04:05 – Electron chemistry explains behavior 
• 06:15 – Summarizing galvanizing, metalizing, and painting 
• 14:15 – Silicate resin technology is understudied 
• 15:47 – Comparing adhesion of each method 
• 17:09 – Engineers understand paint differently than the other methods 
• 20:16 – Surprising results from cyclic aging testing of a two-coat inorganic system 
• 23:43 – Why is paint held to a higher standard? 
• 26:48 – Zinc loading and a sustainability comparison 

Find out more at https://carboline-tech-service-podcast.pinecast.co