Metalizing a carbon steel tank
Metalizing a carbon steel tank
(OP)
The following procedures for coating the outside of two CS tanks were recommended by a NACE certified paint specialist on a project:
1. Tanks shop primed at the factory for shipping.
2. Tanks will be sand blasted / blast cleaned to NACE 1 / SSPC 5 (2 mils)
3. Tanks will be metalized with 100% Zinc (8-10 mils penetration / coating)
4. Tanks will be coated with a water-based, ultra white, high gloss white acrylic paint (8-12 mils)
I am being told by the design engineer that it is not possible to metalize with 100% zinc. He is recommending the following coating:
1. Tanks will be sand blasted / blast cleaned to SSPC 6
2. Tanks will be primed at factory for shipping
3. Tanks will be coated with an epoxy intermediate coat and a polyurethane topcoat.
Additional recommendations for the following have also been sent: Tnemec 90-97 zinc system is the prime coat at 4 mils and the Pot-a-Pox 20 is two coats.
Can anyone lend some insight into this situation?
The tanks will be installed outside in a Caribbean location. There is little direct salt spray, but they will be within sight of a coastline.
1. Tanks shop primed at the factory for shipping.
2. Tanks will be sand blasted / blast cleaned to NACE 1 / SSPC 5 (2 mils)
3. Tanks will be metalized with 100% Zinc (8-10 mils penetration / coating)
4. Tanks will be coated with a water-based, ultra white, high gloss white acrylic paint (8-12 mils)
I am being told by the design engineer that it is not possible to metalize with 100% zinc. He is recommending the following coating:
1. Tanks will be sand blasted / blast cleaned to SSPC 6
2. Tanks will be primed at factory for shipping
3. Tanks will be coated with an epoxy intermediate coat and a polyurethane topcoat.
Additional recommendations for the following have also been sent: Tnemec 90-97 zinc system is the prime coat at 4 mils and the Pot-a-Pox 20 is two coats.
Can anyone lend some insight into this situation?
The tanks will be installed outside in a Caribbean location. There is little direct salt spray, but they will be within sight of a coastline.





RE: Metalizing a carbon steel tank
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>
RE: Metalizing a carbon steel tank
Just saw some thermal spraying concrete with pure zinc.
I thought there might be some environmental restrictions on pure zinc but have found none.
RE: Metalizing a carbon steel tank
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Metalizing a carbon steel tank
We do have a NACE certified guy to do the metalizing at the site, but politics may prevent him from being able to do it. And there is no guarantee he will stay forever, either.
Otherwise, the contractor installing the tanks would have to bring someone & equipment to the site to do the job.
Routine maintenace is not a problem, as long as it gets done. Interestingly enough, the routine maintenance would likely be done by the guy who may not be allowed to coat the tanks in the first place. (Politics again - different color of money)
Given this information, which system seems to be the best fit?
RE: Metalizing a carbon steel tank
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Metalizing a carbon steel tank
RE: Metalizing a carbon steel tank
<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>