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Since 2002, a corrosion inhibiting chemistry package has been an integral part of two specific industrial insulations. This paper explains, at a molecular level, how this package engages a two-pronged defense (physical coating and pH buffering) against CUI.
Since 2002 the chemical package XOX has been an integral part of two specific industrial insulations to actively and continuously inhibit corrosion under insulation (CUI). The package relies on liquid water infiltration as a catalyst to provide a layer of corrosion protection for the life of the insulation. This paper explains at a molecular level how this time-tested package which is integral to domestic calcium silicate and expanded perlite insulations engages a two-pronged defense (physical coating and pH buffering) against CUI. Included are recent third-party test results that compare the corrosion performance of several common industrial insulations using mass loss corrosion rates (MLCR) when tested in accordance with the latest ASTM consensus method adopted in 2005.
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Via the testing of six generically different insulation materials, the study has tried to identify factors in an insulation material that are more influential on corrosion rates of carbon steel.
A laboratory investigation of corrosion under insulation (CUI) using methods given in ASTM G189 for cyclic temperature, wet/dry conditions. Two long term exposure tests of three material conditions and two insulative materials (mineral wool and calcium silicate insulations).