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Quartz Crystal Microbalance with Dissipation: A New Approach of Examining Corrosion of New Copper Surfaces in Drinking Water
Citation:
Tang, M., S. Harmon, M. Nadagouda, AND D. Lytle. Quartz Crystal Microbalance with Dissipation: A New Approach of Examining Corrosion of New Copper Surfaces in Drinking Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 55(16):11265-11273, (2021). https://doi.org/10.1021/acs.est.1c02220
Impact/Purpose:
Corrosion control of copper material in drinking water systems is essential to ensure safe drinking water quality and minimize plumbing failures. This study investigated the impact of pH and orthophosphate on corrosion of new copper surfaces in situ using a novel technique quartz crystal microbalance with dissipation (QCMD). The QCMD results showed that increasing water pH from 6.5 to 9.0 and addition 6 mg/L orthophosphate at pH 6.5 and 9.0 inhibited net mass loss by 51-89%, total copper release by 29-72%, and deposited copper corrosion by-products by 26-72%. The complementary analyses with a digital microscopy, field emission scanning electron microscopy with energy dispersive spectroscopy, and x-ray photoelectron spectrometry showed that the pH and orthophosphate inhibited copper corrosion with slightly different mechanisms based on the morphology, microstructure and composition of deposited copper corrosion by-products. QCMD provided sensitive, rapid, and continuous responses to corrosion and mass changes on the new copper surface and can be a useful tool to evaluate the effectiveness of corrosion control treatment for new copper material.
Description:
Corrosion control of copper material in drinking water systems is essential to ensure safe drinking water quality and minimize plumbing failures. This study investigated the impact of pH and orthophosphate on corrosion of new copper surfaces in situ using a novel technique quartz crystal microbalance with dissipation (QCMD). The QCMD results showed that increasing water pH from 6.5 to 9.0 and addition 6 mg/L orthophosphate at pH 6.5 and 9.0 inhibited net mass loss by 51-89%, total copper release by 29-72%, and deposited copper corrosion by-products by 26-72%. The complementary analyses with a digital microscopy, field emission scanning electron microscopy with energy dispersive spectroscopy, and x-ray photoelectron spectrometry showed that the pH and orthophosphate inhibited copper corrosion with slightly different mechanisms based on the morphology, microstructure and composition of deposited copper corrosion by-products. QCMD provided sensitive, rapid, and continuous responses to corrosion and mass changes on the new copper surface and can be a useful tool to evaluate the effectiveness of corrosion control treatment for new copper material.
URLs/Downloads:
DOI: Quartz Crystal Microbalance with Dissipation: A New Approach of Examining Corrosion of New Copper Surfaces in Drinking Water
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