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Decontamination Chemical Compatibility With Protective Coatings

Decontamination Chemical Compatibility with Protective Coatings
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Most of atmospheric coatings and tank linings for offshore maintenance are routinely applied on rusted steel after dry abrasive blasting.  It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone.  Residual salt contamination, which is hidden in the corrosion pits, is difficult to remove mechanically.  Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be in the range of 5-65 μg/cm2.  Too much residual salt contamination can be detrimental to coating performance.  It could cause coating blistering, adhesion degradation, and under film corrosion which will result in a shorter service life, particularly in immersion service such as pipeline coatings or tank linings.  Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals.

Product Number: 51322-18153-SG
Author: Sophia Xiaoxia Zhu, Benjamin T. A. Chang
Publication Date: 2022
Industries: Coatings and Linings , Coatings
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$20.00
$20.00

Most of atmospheric coatings and tank linings for offshore fabric maintenance are routinely applied on rusted steel after dry abrasive blasting.  It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone.  Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be typically between 5 - 65 μg/cm2.  Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals.  The effectiveness of residual salts removal and prevention of flash rust with the surface preparation method combining the WAB and the decontamination chemicals was verified in our previous AMPP 2021 paper.  The improved flash rust resistance combined with the possible changes of surface properties of the wet abrasively blasted steel surface may affect its compatibility with the applied coating systems, which is of great concern.  

Most of atmospheric coatings and tank linings for offshore fabric maintenance are routinely applied on rusted steel after dry abrasive blasting.  It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone.  Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be typically between 5 - 65 μg/cm2.  Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals.  The effectiveness of residual salts removal and prevention of flash rust with the surface preparation method combining the WAB and the decontamination chemicals was verified in our previous AMPP 2021 paper.  The improved flash rust resistance combined with the possible changes of surface properties of the wet abrasively blasted steel surface may affect its compatibility with the applied coating systems, which is of great concern.  

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