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Remediation of Soluble Salts from Steel Bridges During Re-Painting

Soluble salts may be transferred to a steel bridge or other structure as an airborne aerosol (generally from marine or industrial sources), wind-blown debris, and debris transferred from vehicles. Perhaps the most significant source of soluble salts on bridges is from de-icing materials. Once on the structure, salts may become incorporated into corrosion scale, poultice, or crevices. 

Product Number: 51219-172-SG
Author: J. Peter Ault, Nick Fabritiis
Publication Date: 2019
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$20.00
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Soluble salts may be transferred to a steel bridge or other structure as an airborne aerosol (generally from marine or industrial sources), wind-blown debris, and debris transferred from vehicles. Perhaps the most significant source of soluble salts on bridges is from de-icing materials. Once on the structure, salts may become incorporated into corrosion scale, poultice, or crevices. There is substantial data demonstrating that soluble salts can affect coating performance, though there are varying opinions regarding the acceptable level of soluble salt contamination. A variety of surface preparation techniques may be used to remediate soluble salts prior to coating application. Sometimes multiple techniques are used to reduce soluble salt contamination below the prescribed limits. This paper presents data on commercially used soluble salt remediation techniques evaluated in a laboratory setting. The reduction in soluble salts was measured for each technique. The data shows that the effectiveness of the remediation techniques is highly dependent on the surface being remediated. In some cases, pressure washing may be adequate, while a combination of methods may be required in other instances.

Soluble salts may be transferred to a steel bridge or other structure as an airborne aerosol (generally from marine or industrial sources), wind-blown debris, and debris transferred from vehicles. Perhaps the most significant source of soluble salts on bridges is from de-icing materials. Once on the structure, salts may become incorporated into corrosion scale, poultice, or crevices. There is substantial data demonstrating that soluble salts can affect coating performance, though there are varying opinions regarding the acceptable level of soluble salt contamination. A variety of surface preparation techniques may be used to remediate soluble salts prior to coating application. Sometimes multiple techniques are used to reduce soluble salt contamination below the prescribed limits. This paper presents data on commercially used soluble salt remediation techniques evaluated in a laboratory setting. The reduction in soluble salts was measured for each technique. The data shows that the effectiveness of the remediation techniques is highly dependent on the surface being remediated. In some cases, pressure washing may be adequate, while a combination of methods may be required in other instances.

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For offshore platform maintenance coating operation dry grit blasting is a common practice to clean the steel surface. The offshore platform steels are in a various degree of corrosion. It is well known that dry grit blasting alone cannot remove salts completely and some residual salts remain on blasted steel surface. In offshore corrosive environment grit blasted steel surfaces will quickly become rusted within a couple of hours. It is hard to keep the desired near white metal finish for 2-4 hours until the coating spray application. There are several commercial cleaning chemicals to remove residual salts and to extend the surface cleanliness time.This paper covers the testing and comparison of some of these chemicals and impact on coating performance. The evaluation was in 2 parts:1. Compare various salt removal solutions.2. Evaluate the compatibility and impact of the best salt removal solution on coating performance.In the first part of the testing tests showed that one of the products did out-perform the other chemicals to remove residual salts and maintain a desired surface pH.The second part of testing was done since there was a concern about the compatibility of the salt removal product and coatings. Thus the best salt removal product was then further tested with various coating types applied. Three (3) atmosphere coatings and three (3) tank linings (immersion grade) were selected for the compatibility study.The conclusion was that one salt removal solution did out-perform other systems and the salt removal solution was compatibility with the various coatings and improved performance of the coating.