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Corrosion Treatment |
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high pressure washing/blasting |
rusting on silo roofs |
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Preparation is of prime importance before painting any steelwork. Cold
water, high pressure washing/blasting must be carried out before any
primer can be applied. For more information and pictures of blasting,
please see our
Pressure Blasting section.
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coating with rust stabiliser primer |
All rusted steel must be coated with a rust stabiliser primer converter
before any paint system can be applied. Rust in the steelwork must be
stabilized and rendered inactive for any coating to have a long and
useful life and of course for it to be cost effective. |
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The paint or coating system can then be applied using either a
multi coat system or a high build system to produce a good
thickness of protective coating.
Today we tend to use industrial epoxy resin which has a very
high build, in fact one coat application can be the equivalent
of two coats alkyd. The cost saving can be considerable both on
labour and materials.
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application of industrial epoxy resin |
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Elevated wet bins |
We can avoid the expensive zinc undercoat and go straight into HB epoxy
resin. For the top coat we can now design a coating to suit, for example for
grain silos, where we can introduce micaceous iron oxides into the resin
and produce a similar to the original galvanized factory finish. |
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For the areas which cannot be either viewed or painted, we use Vapour
Corrosion Inhibitor (VCI). Where beams or girders close together, VCI is
introduced by low pressure spray and then the area is isolated by a line
of mastic to produce a sealed micro environment where rust cannot be
active, the rusting is chemically killed off and will not restart for
many years or until the seal is broken and air is introduced. This
process prevents the unsightly rust staining often seen after structures
have been painted.
For the protection of steel stanchions embedded in concrete down below
floor level, we can introduce an MCI or Migrating Concrete Inhibitor.
The material soaks into the concrete around the foot of the stanchion
and then travels by reverse osmosis through the mass of the concrete
seeking out steelwork where it attaches to and stops the rust activity.
This material is also used for introducing into mortar whilst being
mixed and protects steelwork after the concrete has cured and goes on
protecting for many years.
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