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
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