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09501 Zn-rich Primer Evaluation for Corrosion Protection of US Marine Corps Ground Vehicles

Picture for 09501 Zn-rich Primer Evaluation for Corrosion Protection of US Marine Corps Ground Vehicles
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Product Number: 51300-09501-SG
ISBN: 09501 2009 CP
Author: Leonardo Caseres and Darrell Dunn
Publication Date: 2009
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$20.00
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At present, corrosion protection of USMC steel components is being implemented through an initial abrasive blasting of the metal substrate followed by the application of solvent or water based coatings, which does not appear to provide sufficient long-term corrosion protection, especially if the coating is partially disrupted exposing the base metal. To address this issue, primer coatings, containing high concentrations of sacrificially available Zn, can be used for long-term protection of steel. Electrochemical tests were conducted to determine the corrosion performance of various commercially available Zn-rich coating products applied to steel immersed in simulated seawater for up to 2,000 hr. Initial findings show distinctive corrosion protection of the Zn-rich coatings, manifested by the difference in the open circuit potentials and corrosion rates between the coatings tested. For open circuit potentials more noble than -750 mV, electrochemical measurements indicated some corrosion in progress of steel and poor galvanic protection by the coating. At more negative potentials, enhanced galvanic protection by the surrounding coating was noted for some of the Zn-rich coatings tested, resulting in larger protective currents and prevention of steel corrosion for up to 2,000 hr of exposure.
At present, corrosion protection of USMC steel components is being implemented through an initial abrasive blasting of the metal substrate followed by the application of solvent or water based coatings, which does not appear to provide sufficient long-term corrosion protection, especially if the coating is partially disrupted exposing the base metal. To address this issue, primer coatings, containing high concentrations of sacrificially available Zn, can be used for long-term protection of steel. Electrochemical tests were conducted to determine the corrosion performance of various commercially available Zn-rich coating products applied to steel immersed in simulated seawater for up to 2,000 hr. Initial findings show distinctive corrosion protection of the Zn-rich coatings, manifested by the difference in the open circuit potentials and corrosion rates between the coatings tested. For open circuit potentials more noble than -750 mV, electrochemical measurements indicated some corrosion in progress of steel and poor galvanic protection by the coating. At more negative potentials, enhanced galvanic protection by the surrounding coating was noted for some of the Zn-rich coatings tested, resulting in larger protective currents and prevention of steel corrosion for up to 2,000 hr of exposure.
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