Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (270 KB)

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

Author: Zelinka, Samuel; Stone, D.S.;

Date: 2011

Source: Materials and corrosion. Vol. 62, no. 8 (Aug. 2011): p. 739-744.

Publication Series: Scientific Journal (JRNL)

Description: 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 Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.



Zelinka, S.L.; Stone, D.S. 2011. The effect of tannins and pH on the corrosion of steel in wood extracts. Materials and corrosion. Vol. 62, no. 8 (Aug. 2011): p. 739-744.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.