CORROSION AND ITS SIGNIFICANCE

The damage, occurring in the metals and alloys which enter into electrochemical and chemical reactions with their surroundings consisting of mostly aqueous and gas mediums, is called corrosion.

Most of the metals widely used in the industry lose their stabilities in various mediums, including atmosphere and ground. All of the metals, excluding gold and platinum, are found in oxidized form in nature. It is a challenging process to isolate metals from their oxides and this requires the use of large amounts of raw materials, energy and manpower. In terms of thermodynamics, at the end of this process, while the metals are transferred to a higher energy level, their entropies decrease. The tendency of the metals to return back to their states in nature is the driving force behind the corrosion.

Corrosion is a slow progressing phenomenon. Therefore it takes long time to see its detrimental outcomes. This phenomenon is the main reason for undervalue corrosion in the design of metallic structures. In fact, corrosion is the major factor in determining the investment and production costs in the industry. According to some estimations, the cost of corrosion to a nation reaches to 3.5-5.0% of the gross national product. As for Turkey, there are estimations claiming that this value is not less than 4.5%. Today, as the concerns on environmental pollution and safety gradually increase, the duty of scientists and engineers should be to develop and implement the techniques for efficient control of corrosion.

Among the major problems in today's world is the ongoing lack of knowledge at an alarming level on corrosion and its possible outcomes. Finding a remedy to this should be the most important issue in our agenda. It is evident that the struggle against corrosion can reach to success in a harmonious approach, with the participation of universities, industry, state and non-governmental organizations.