Corrosion Behaviors Of Tool Steel In Tannic Acids

Yeoh, Seng Fu (2010) Corrosion Behaviors Of Tool Steel In Tannic Acids. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this project is to analyze the corrosion behavior of cutting tool material use in the wood industry which cause by tannic acid. According to the wood species and type of metallic materials, the wear of woodcutting tools is very different. The metallic nature of cutting tools, water and water-soluble components in the wood will cause an electrochemical mechanism of corrosion. Both mechanical wear and electrochemical action are responsible of the total wear of metallic tools. Therefore, the objective of this study is to characterize the electrochemical action of the wood medium on the corrosion of the woodcutting tool materials. It identifies the composition element in steel that influence the corrosion behavior. Usually, tannic acid extracts from various plants and will react with the iron to form ferrous-tannates as rust on steel. The method starts with preparing the tannic acids solution in different concentration and immersed the carbon steel blade in tannic solution. The parameter like pH, concentration and temperature changes in experiment to investigate how it affects the corrosion behavior. In order to evaluate composition element affect corrosion behavior, six type specimens (carbon steel and tungsten carbide) need to immerse in tannic acids for certain time. Then, it will apply Gamry Instrument Framework Software to carry out corrosion test for finding its corrosion rate, corrosion resistance and corrosion potential of corroded system. From data obtain, the pH of tannic begin decrease when temperature reaches 60°C and thus increase corrosion rate. Result shows that the material that have highest chromium (>4%) have lowest corrosion rate. Mostly, tungsten carbide has high corrosion resistance than carbon steel. Chemical reaction between tannins and iron produce blue black deposits of iron (III) tannates complexes on surface material. As a result, pitting corrosion occurs as a small hole on that material after several hours.

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