Quick Drying Zinc-Rich Primer?

Question

Quick Drying Zinc-Rich Primer?

justhumm (Structural)

(OP)

17 May 18 20:15

Steel pipe piles for a bridge foundation are scheduled to be shop-coated with an inorganic zinc-rich primer, like a Carbozinc or similar. This is to provide an extra layer of protective barrier for the steel, because the piles are being installed in an old industrial area with fairly corrosive soils.

http://www.carboline.com/products/product-details/?prod=0250

The pipe piles are fairly long and will be spliced / butt-welded together in the field.

Does anyone have a recommendation for a quick-drying (SAY less than 1/2-hour in 45-deg F temperatures), field-applied touch-up primer to place over the welded seams?

Thanks!

hokie66 (Structural) · Answer 1 · 2018-05-17 23:20:10

Have you requested help from Carboline? They are the experts, especially with their own coatings.

epoxybot (Structural) · Answer 2 · 2018-05-18 00:09:14

Like hokie66 states, talk to Carboline. Ask for an Applications Specialist. It might be possible to accomplish if you could maintain a substrate temperature of 100F during the set-up to handling time. The acceptable substrate application temperate for this product is 200F or less, based on their data sheet. Heating the material itself, above room temperature won't make a difference, since once it is spread on the substrate it will quickly assume the temperature of the substrate.

Ron (Structural) · Answer 3 · 2018-05-21 02:05:40

In my opinion it is ill advised to use a paint coating on driven piles. Since the coating is zinc rich, it will provide protection except in areas that get scratched, which will be many areas from abrasion and driving. In areas where the coating is breached, corrosion concentration will set up, causing exacerbated corrosion rates in those areas. I would leave the piles uncoated to allow larger areas of generalized corrosion rather than concentrated areas. Use a thicker pipe wall to give a corrosion allowance.

Andrew1974 (Chemical) · Answer 4 · 2018-05-30 18:17:25

Hello, an excellent quick drying product is Gulf Coast Paint- MCU100. https://gulfcoastpaint.com/mcu-100-primerfinish-mo...

We use this on structural steel in our facility. Can apply 2 coats with 3 hours. Very fast drying and designed for industrial area.

Andy

justhumm (Structural) · Answer 5 · 2018-05-31 22:32:43

Thanks for the responses, all!

I did end up contacting Carboline and talking with one of their applications guys. So I just figured I would note this down for prosperity...

For a field touch-up application with their Carbozinc 11 product, he recommended Carbomast 615 AL. The product could be roller applied. And if the steel surface could be warmed / maintained between 75 and 100 deg F, the epoxy could probably be cured in 1-hour.

Though, in the end, the project owner decided to go against it's own specifications and skip the coating in entirety. So, Ron, you win.

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Quick Drying Zinc-Rich Primer?