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The Effect of Four Commercially Available Steel Decontamination Processes on the Performance of Internal Linings

The Effect of Four Commercially Available Steel Decontamination Processes on the Performance of Internal Linings
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Internal linings used for corrosion protection often have to perform under severely corrosive environments. One major concern regarding coating performance is the negative effect of soluble salts on the steel substrate at the time of lining application, particularly for higher temperature lining applications. These salts impact the ability of the applied coating systems to protect the steel in several ways including osmotic coating blistering, promotion of under-film metallic corrosion and lining disbondment. 

Product Number: 41215-911-SG
Author: Michael Melancon, Paul Hunter, Amal Al-Borno, Tomasz Liskiewicz, Sherry Rao, Bassem Salamah, Shailesh Dhoke, Steve Hourcade, Julius Cortes, Xianyi Chen
Publication Date: 2015
Industries: Test Method , Coatings , Coatings and Linings
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$20.00
$20.00

Internal linings used for corrosion protection often have to perform under severely corrosive environments. One major concern regarding coating performance is the negative effect of soluble salts on the steel substrate at the time of lining application, particularly for higher temperature lining applications. These salts impact the ability of the applied coating systems to protect the steel in several ways including osmotic coating blistering, promotion of under-film metallic corrosion and lining disbondment. This paper focuses on removal of soluble salts contamination by commercially available decontamination processes in relation to internal lining. We directly compare the effectiveness of four cleaning methods with the performance of three lining systems. The methodology of surface contamination and preparation of test panels is discussed. After cleaning, sample evaluation for chloride, sulfate and nitrate ion contamination levels was carried out using field method (commercial chloride ion test kit for surfaces) and ion chromatography method. Additionally, scanning electron microscopy / energy dispersive X-ray spectroscopy (SEM/EDX) and elemental surface mapping analysis were carried out. Laboratory testing of lining systems included adhesion, both pull off and X-cut, porosity, electrochemical impedance spectroscopy (EIS) analysis, cathodic disbondment and hot water soak test and 160-day standard Atlas cell testing.

Internal linings used for corrosion protection often have to perform under severely corrosive environments. One major concern regarding coating performance is the negative effect of soluble salts on the steel substrate at the time of lining application, particularly for higher temperature lining applications. These salts impact the ability of the applied coating systems to protect the steel in several ways including osmotic coating blistering, promotion of under-film metallic corrosion and lining disbondment. This paper focuses on removal of soluble salts contamination by commercially available decontamination processes in relation to internal lining. We directly compare the effectiveness of four cleaning methods with the performance of three lining systems. The methodology of surface contamination and preparation of test panels is discussed. After cleaning, sample evaluation for chloride, sulfate and nitrate ion contamination levels was carried out using field method (commercial chloride ion test kit for surfaces) and ion chromatography method. Additionally, scanning electron microscopy / energy dispersive X-ray spectroscopy (SEM/EDX) and elemental surface mapping analysis were carried out. Laboratory testing of lining systems included adhesion, both pull off and X-cut, porosity, electrochemical impedance spectroscopy (EIS) analysis, cathodic disbondment and hot water soak test and 160-day standard Atlas cell testing.

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