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Title: Copper distribution and oxidation states near corroded fasteners in treated wood

Source: SN Applied Sciences. 1(3): 1-10.

Author(s)Zelinka, Samuel L.; Jakes, Joseph E.; Kirker, Grant T.; Passarini, Leandro ; Hunt, Christopher G.; Lai, Barry ; Antipova, Olga ; Li, Luxi ; Vogt, Stefan

Publication Year: 2019  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B   FPL-4716-1A   FPL-4723-3A

Abstract: Metal 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.

Keywords: X-ray fluorescence Microscopy (XFM); X-ray absorption near edge spectroscopy (XANES); preservative treated wood; corrosion; copper

Publication Review Process: Formally Refereed

File size: 5,120 kb(s)

Date posted: 04/12/2019

This publication is also viewable on Treesearch:  view
RITS Product ID: 93922
Current FPL Scientists associated with this product (listed alphabetically)
Hunt, Christopher G.
Research Chemist
Jakes, Joseph
Research Materials Engineer
Kirker, Grant
Research Forest Products Technologist
Zelinka, Samuel L.
Materials Research Engineer

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