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Insulation with Corrosion-Prevention Function for External Corrosion Inhibition: Japanese Patent No. 4201733 obtained
1. External corrosion of carbon steel
under the insulation

There are cases where corrosion occurs on the carbon steel under the insulation when water penetrates into the insulation material. Especially in cases where the environment has a high salt content such as coastal areas or where the operating temperature is relatively low at 60 - 80°C, corrosion is likely to occur.

2. Current method for inhibit external corrosion
1.Protection of carbon steel by coating
- Anticorrosive double coating specification
Deterioration due to rainwater or heat
2.Insulation absorption inhibition
- Application of water-repellent insulation
Water repellency reduced at 250°C or more
3.Exterior material joint sealing
- Application of silicon sealant
Joint cutting
These methods do not become long-term measures to inhibit corrosion?

3. New measures to inhibit external corrosion (Keical Ace WIN)

"Keical Ace WIN" is a new type of insulation. The special anticorrosion pigment (calcium phosphate and Nitrous acid type hydrocalumite) is fixed inside calcium silicate (JIS A 9510 type 1-15 equivalent) which features lightweight, high strength and low thermal conductivity.

The special anticorrosion pigment has the following properties:

Anticorrosive action of calcium phosphate

1 When contact is made with water, the alkaline component is released to promote passivation.

Anticorrosive action of Nitrous acid type hydrocalumite (anion-exchange reaction)

2 When contact is made with salt, salt is adsorbed into the Nitrous acid type hydrocalumite.

3 At the same time, nitrous acid ion(corrosion inhibitor) is released to promote passivation.

In the highly-concentrated saline environment or when water is intruded, greater anticorrosive performance can be expected from "Keical Ace WIN" with the two properties of a special anticorrosion pigment, compared with conventional insulation.

Conventional Insulation

4. Demonstration experiment
Feeding of hot water every 1.5 hrs. to hot-water pipe (3B)
Pipe surface temperature:
  Pipe corrosion state after disassembly
Spray Test Period: 1 year Spray Test Period: 1 year Spray Test Period: 1 year
<Test Conditions>
Insulation 3" x 30mm with no exterior material
3% NaCl spray, 200 ml x twice per week
  WIN has the effect of corrosion inhibition.

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