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Title: The effect of tannins and pH on the corrosion of steel in wood extracts

Source: Materials and Corrosion 2011, 62, No. 8; 2011

Author(s)Zelinka, S.L.; Stone, D.S.

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4723-1

Abstract: Tannins and pH are often cited as factors that affect the corrosiveness of wood yet there are few data to confirm these statements. The purpose of this paper is to systematically investigate the effect of tannins and pH on corrosion of metals in wood. Four wood species known to vary in both their pH and extractives were chosen and extracted with water. The pH, tannin content, and corrosion rate of carbon steel were determined for each extract.To test if pH and tannin were the only factors influencing corrosion, ″synthetic″ extracts were made by adding tannins to distilled water and adjusting the pH. At a given pH, increasing the tannin content inhibited corrosion and at a given level of tannin content, lowering the pH increased corrosion. An isocorrosion map as a function of pH and tannins was developed by using simple kinetic models to extrapolate the data. The data may be useful in estimating the relative corrosiveness of new, nonmetallic wood preservatives based upon the chemistry of naturally durable wood species.

Keywords: Metals, testing, corrosion, anti-corrosives, tannins, electrochemical analysis, steel, electric measurements, plant extracts, accelerated life testing, polarization, black locust, southern pines, white oak, elm, exposure tests, electric properties, wood extractives, accelerated testing, kinetics, durability

Publication Review Process: Formally Refereed

File size: 271 kb(s)

Date posted: 09/07/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 39280
Current FPL Scientist associated with this product
Zelinka, Samuel L.
Materials Research Engineer

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