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Phospmoric acid.

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mattinker:

--- Quote from: PekkaNF on November 26, 2019, 01:13:26 PM ---This is ineresting problem. I am aware remotely only three different sructures that might be aplicable to this on to a limited degree.

1. In very harsh conditions epoxy coated rebar is used. There are some paints to be used with structures that stick out of concrete. I have heard that there are different types of concrete and some of them (and partly reinfoce materials or expanders or such) can cause incompabilyt probles.  Maybe local shop sells something like this and you can contact someone.
https://www.rustoleum.com/product-catalog/industrial-brands/industrial-choice/spray-paint/rb1600-system-rebar-epoxy-spray-paint

Once I had some problems with a testpiece and one particular one-mix two componenet epoxy and after a day the chemist on their development department called me and told that he thinks he knows what the problem was and told me how to avoid it.

2: Here in building indusry hot galvanized mounts are used when something is attached onto concrete. hardware sores sell J-bolts and pilar brackets that the other end is stuck into concrete and then cast. There is screw that is used to level the pilar bracket.

4: machine building in industrial buildingis inside: Long bolts are welded into bottom rebars and stas added. These bolts are covered with elastic material to prevent them from sticling into concrete 8that would be bad for tensioning (torquing bolt), cocrete is cast, then end of the bolt is painted and grouting is cast to level. Then basepaltes are leveled and injection epoxy layer is injected between grouting and base plates. Finally bolts are torgued and then cocrete will shrink 400 years and after that starts eroding.

--- End quote ---

Pekka,
This is a fifty year old industrial building that I'm repairing for what I hope is the last time! Thank you for your thoughts!! Regards, Matthew

awemawson:
The steel boat repairers having grit blasted and welded up any horrors  spray phosphoric acid on to remove flash rusting then apply epoxy primer. Can you not use something similar as a barrier coat if only to quell your concerns ?


("Project Brupeg", and "SV Seeker" on Youtube are examples)

JerryNotts:
When jobs were done by professionals on the basis of many years experience the correct process for steel sections was shotblast totally clean and dry then zinc rich primer. NB Primers of any type always need another coat of paint on top. All allowed to dry thoroughly, 5 days plus. Many structures in the British Isles are still standing over 50 years later.

Jerry

mattinker:
Jerry,

Thank you for your comment! This job is in a hole in a wall where nobody could shot blast anything! It is less accessible than the other three pillars that I've done, it is below ground level on the outside, below the floor behind the soil pipe, grey water pipe, gas supply and the water pipe! Curiously, I have been metal working my entire life, most of that professionally! I want to get as much rust protection as possible as I can't get into all of the nooks and crannies!

Regards, Matthew

mattinker:

--- Quote from: awemawson on November 26, 2019, 04:13:15 PM ---The steel boat repairers having grit blasted and welded up any horrors  spray phosphoric acid on to remove flash rusting then apply epoxy primer. Can you not use something similar as a barrier coat if only to quell your concerns ?


("Project Brupeg", and "SV Seeker" on Youtube are examples)

--- End quote ---

That's the sort of thing Andrew. The biggest problem for me is rust removal. It's realy hard to get to!

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