The Conneticut department that writes specifications and contracts for bridge repair in that state has determined the flash rusting is not a problem.
There are four types of ferrous oxidation. They have similar molecular identifiers but each successive stage includes one more oxygen atom. Flash rust is the first. The second and third stage are the most destructive to the metal. They both produce microscopic worm holes that are nearly impossible to clean in the field and will continue to decay the steel after covered with paint. The only remediation is to use zinc rich paint formulas. The zinc will sacrifice itself and delay the steel from doing the same.
CT will allow painting over flash rust. I seem to recall somewhere that flash rusting can promote paint adhesion under most circumstances. Flash rusting over worm holes is not satisfactory but may have to tolerated because a genuine "white metal" surface preparation cannot be realistically achieved.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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