Welcome.
Part 1: Why Overcoating Systems Fail
(Part 2: What to do about it. – below.)
Can one hope for an overcoat system able to stop crevice corrosion and provide durable overcoat protection with the longest corrosion mitigation intervals per structure?
Fulfill the following conditions to enjoy unique and field-proven rust control that the Termarust HRCSA corrosion mitigation system has been delivering to market since 1990.
Condition 1: Practical surface preparation specifications lay a solid foundation for substrate coating stabilization and long-term corrosion mitigation.
High-pressure water cleaning using 7,000 psi, 6 GPM, hot water and a zero-degree rotating tip removes loose rust, dirt, oils, and non-adherent paint to dull putty-knife test standard. [Investment costs are within reach making such technology more broadly available.]
Clean, dry tightly adhered remaining coatings last longer when overcoated with low-surface energy chemically active barrier coatings which do not ‘shrink and pull off’ tightly adhered overcoated paint.
Note: Profile-sensitive coating systems with high surface energy formulas make poor overcoating systems delaminate overcoated paints resulting in premature failures.
Condition 2: Choose an active chemistry that interacts with steel to neutralize corrosion cells while encapsulating it with an elastomeric barrier.
When rust bleeding continues, section loss and damage to steel under the barrier coatings continue. This photo only two years after painting.
When refurbishing old steel, the selected overcoat system which can provide both long-lasting barrier protection and stop corrosion crevice corrosion (rust bleeding from inside plates).
Condition 3: Substrates must have corrosive causing contaminants such as salts thoroughly removed through pressure-washing with salt mitigation additive and dried before being overcoated.
Failure to mitigate salts on the substrate: leads to corrosion underneath the coating system.
Condition 3 (cont.): Overcoating active corrosion with hard film-forming barrier coatings only masks corrosion cells. Because all liquid applied coatings are moisture-vapor permeable, residual surface salts will draw in moisture and continue the corrosion cycle.
Rule: You cannot cover up an active corrosion cell.
Part 2: What to do about it.
HRCSA overcoated structure after 10-years with no rust bleeding.
Termarust customers enjoy the benefit of high-performance rust mitigation with HRCSA chemically active barrier systems engineered to stop all corrosion – including crevice corrosion.
Application procedures are practical, user-friendly and our recommended high-pressure wash pressure ranges will not micronize lead paint – leading to notable reductions in enclosure and wastewater management costs.
Learn more about the Termarust HRCSA corrosion mitigation system. Subscribe below for updates or contact us direct: