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51316-7038-Corrosion of Metals in Treated Wood Examined by Synchrotron Based Xanes and XFM

Picture for Corrosion of Metals in Treated Wood Examined by Synchrotron Based Xanes and XFM
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Copper based waterborne wood preservatives increase the corrosion of metals embedded or in contact with the treated wood.  We examine wood that was in contact with corroding metal with synchrotron based X-ray fluorescence microscopy (XFM) and X-ray Absorption Near Edge Spectroscopy (XANES) to test if the  proposed corrosion mechanism is correct.

 

Product Number: 51316-7038-SG
ISBN: 7038 2016 CP
Author: Samuel Zelinka
Publication Date: 2016
Industry: Science of Corrosion
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Copper based waterborne wood preservatives are frequently used to extend the service life of wood products used in outdoor environments. While these copper based treatments protect the wood from fungal decay and insect attack they increase the corrosion of metals embedded or in contact with the treated wood. Over the past ten years several studies have looked at the corrosion mechanisms for metals in contact with copper treated wood. These studies have concluded that the most plausible corrosion mechanism involves the migration of copper ions from the wood treatment through the wood to the metal surface where they are then reduced. Despite this under almost all conditions copper has not been detected in the corrosion products as the proposed mechanism would imply.Here we examine wood that was in contact with corroding metal with synchrotron based X-ray fluorescence microscopy (XFM) and X-ray Absorption Near Edge Spectroscopy (XANES) to test whether the previously proposed corrosion mechanism is correct and if so why copper is not deposited on the metal surface. With XFM we are able to detect copper in the wood and construct a copper concentration profile map with a spatial resolution of 0.2µm down to trace (less than 0.01 µg cm-3 ) concentrations. We compliment these measurements with XANES a technique that allows us to differentiate between the different ionic states of copper in the wood. Together these measurements give for the first time an experimental method to test the previous theories of the role of copper in the corrosion metals in treated wood.

Key words: downloadable, preservative treated wood, steel, cupric ions

Copper based waterborne wood preservatives are frequently used to extend the service life of wood products used in outdoor environments. While these copper based treatments protect the wood from fungal decay and insect attack they increase the corrosion of metals embedded or in contact with the treated wood. Over the past ten years several studies have looked at the corrosion mechanisms for metals in contact with copper treated wood. These studies have concluded that the most plausible corrosion mechanism involves the migration of copper ions from the wood treatment through the wood to the metal surface where they are then reduced. Despite this under almost all conditions copper has not been detected in the corrosion products as the proposed mechanism would imply.Here we examine wood that was in contact with corroding metal with synchrotron based X-ray fluorescence microscopy (XFM) and X-ray Absorption Near Edge Spectroscopy (XANES) to test whether the previously proposed corrosion mechanism is correct and if so why copper is not deposited on the metal surface. With XFM we are able to detect copper in the wood and construct a copper concentration profile map with a spatial resolution of 0.2µm down to trace (less than 0.01 µg cm-3 ) concentrations. We compliment these measurements with XANES a technique that allows us to differentiate between the different ionic states of copper in the wood. Together these measurements give for the first time an experimental method to test the previous theories of the role of copper in the corrosion metals in treated wood.

Key words: downloadable, preservative treated wood, steel, cupric ions

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