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Copper distribution and oxidation states near corroded fasteners in treated woodAuthor(s): Samuel L. Zelinka; Joseph E. Jakes; Grant T. Kirker; Leandro Passarini; Christopher G. Hunt; Barry Lai; Olga Antipova; Luxi Li; Stefan Vogt
Source: SN Applied Sciences. 1(3): 1-10.
Publication Series: Scientific Journal (JRNL)
Station: Forest Products Laboratory
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DescriptionMetal fasteners are used to hold wood structures together. In outdoor applications, these fasteners are subject to corrosion when the wood is treated with certain preservative treatments. Typically, these treatments contain copper. Prior work has hypothesized that the mechanism of corrosion in treated wood involves reduction of copper ions from the wood treatments. However, copper was rarely detected in the corrosion products of metals embedded in treated wood, which contradicts the hypothesized mechanism. This present work utilizes synchrotron based X-ray fuorescence microscopy (XFM) and X-ray absorption near edge spectroscopy to examine the corrosion mechanism in treated wood by looking at the spatial distribution and oxidation states of copper in the treated wood near the fastener and in the corrosion products removed from the fastener surface. The samples were obtained after a 1-year corrosion test. In the wood cell walls, the oxidation state of the copper treatment did not change in the immediate vicinity of the fastener, although there was a depletion of copper near the fastener. Furthermore, copper was detected in the corrosion products in trace amounts using XFM. Together, these techniques confrm that the corrosion mechanism involves transport of the cupric ions to the fastener surface, where they are reduced and suggest that previous attempts to detect copper were unsuccessful because the concentration of copper in the corrosion products was below the level of detection of the previously used techniques.
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CitationZelinka, Samuel L.; Jakes, Joseph E.; Kirker, Grant T.; Passarini, Leandro; Hunt, Christopher G.; Lai, Barry; Antipova, Olga; Li, Luxi; Vogt, Stefan. 2019. Copper distribution and oxidation states near corroded fasteners in treated wood. SN Applied Sciences. 1(3): 1-10.
KeywordsX-ray fluorescence Microscopy (XFM), X-ray absorption near edge spectroscopy (XANES), preservative treated wood, corrosion, copper
- Synchrotron based x-ray fluorescence microscopy confirms copper in the corrosion products of metals in contact with treated wood
- Exposure testing of fasteners in preservative treated wood : gravimetric corrosion rates and corrosion product analyses
- Corrosion of metals in treated wood examined by synchrotron based xanes and XFM
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