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Development and Implementation of a Novel Method to Remove Inorganic Zinc Coating from Low Alloy Steel

Development and Implementation of a Novel Method to Remove Inorganic Zinc Coating from Low Alloy Steel
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Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm. 

Product Number: 41215-913-SG
Author: Barry Messer, Yasir Idlibi, Sergio Vitomir
Publication Date: 2015
Industries: Test Method , Coatings , Coatings and Linings
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$20.00
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Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm. Typical blasting and etching procedures were unable to effectively remove the coating. The success of this IOZ removal method is the first-known achievement of IOZ removal to trace levels below 1 ppm. This method can be utilized in restoration projects of bridges and structural steel where abrasive blasting is not practical or environmentally unsafe. This paper discusses the chemical mechanism of this new coating remover, method of application and testing, the validation program utilizing X-Ray fluorescence (XRF) analyzer energy dispersive X-ray spectroscopy (EDX) calibration, and effective field implementation.

Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm. Typical blasting and etching procedures were unable to effectively remove the coating. The success of this IOZ removal method is the first-known achievement of IOZ removal to trace levels below 1 ppm. This method can be utilized in restoration projects of bridges and structural steel where abrasive blasting is not practical or environmentally unsafe. This paper discusses the chemical mechanism of this new coating remover, method of application and testing, the validation program utilizing X-Ray fluorescence (XRF) analyzer energy dispersive X-ray spectroscopy (EDX) calibration, and effective field implementation.

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