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1.3 Objective
i. To analyze the corrosion behavior of cutting tool material (carbon steel and
tungsten carbide) in tannic acid by electrochemical method
ii. To determine corrosion rate of tool steel by using Polarization Resistance and
Tafel Technique under Gamry Instrument Framework Software
iii. To evaluate the effect of pH, concentration and temperatures of tannin acids
to the corrosion behavior of cutting tool material
iv. To identify composition element in cutting tool material that influence its
1.4 Scope
corrosion behavior
The scope of this project is study about the corrosion mechanism of the cutting tool
in the wood industry which cause by tannic acids. The sample uses are three different
types of carbon steel and tungsten carbide. The tannic acids will be prepared in
different type solution. This sample will be immersed in tannic acids for different
temperature. The corroded samples were viewed by optical microscope. The all
corrosion test is control under Gamry Instrument Framework Software with Tafel
Technique and Polarization Resistance Method. Through Tafel graph, the data can
interpret from the Tafel plot such as corrosion current density and corrosion potential
of corroded system. Analysis on corroded microstructure will include in this project.
1.5 Problem Statement
Obviously, the cutting tools in the wood industry often suffer from corrosion. These
is due to wood industry are poor knowledge on degradation phenomenon of tools in
contact with wood. It shows that different woods have a different corrosive impact. It
is very difficult to know which type of cutting tool to use for sawing the various type
of wood which contain different concentration tannic acid. So, it is important to learn
more about the corrosive agent of different woods.
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