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    Description

    This paper compares two methods of measuring the corrosion of steel and galvanized steel in wood: a long-term exposure test in solid wood and a rapid test method where fasteners are electrochemically polarized in extracts of wood treated with six different treatments. For traditional wood preservatives, the electrochemical extract method correlates with solid wood exposure which suggests that the reduction of cupric ions is the cathodic reaction in both the solid wood and the extract. For treatments without copper, the extract method predicted a higher corrosion rate than the solid wood exposure. For these treatments, the cathodic reaction appears to be the reduction of acid and dissolved oxygen. The practical implication of this work is that in some cases, the rapid test method could be used to screen new fasteners and wood preservatives. Scientifically, this work increases the understanding of the mechanism of corrosion of fasteners in treated and untreated wood.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Zelinka, Samuel L.; Stone, Donald S. 2011. Corrosion of metals in wood: Comparing the results of a rapid test method with long-term exposure tests across six wood treatments. Corrosion science 53(5): 1708-1714.

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    Keywords

    Metal testing, corrosion, anti-corrosives, fasteners, joints, wood preservatives, metal corrosion, steel corrosion, galvanized steel, zinc, iron oxides, copper, chemical reactions, moisture, wood moisture, service life, accelerated life testing, electrochemical analysis, electric measurements, electric properties, wood extractives, accelerated testing, connectors, treated wood, preservative treated wood, exposure tests, preservatives, chromated copper arsenate, CCA, alkaline copper quat, ACQ, didecyl dimethyl ammonium carbonate, DDAC, copper azole, CuAz, moisture content

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https://www.fs.usda.gov/treesearch/pubs/38662