Studies on Some Indole Derivatives as Corrosion Inhibitors for C-Steel in aqueous Media

Abstract

As known that the economic power of a country is determined by its output of steel. So, studies of steel properties in general and electrochemical, especially, have been received a great attention. In such respect, the corrosion and corrosion inhibition of steel in the different media become very interesting and important owing to its wide applicability in industry and domestic life. The purpose of the present investigation is to study the corrosion and corrosion inhibition of steel in acid chloride solutions in absence and presence of some selected indole series of compounds. The thesis comprises three main chapters, the first one is concerned with an introduction reviewing concisely the relevant literature related to the project of investigation. Chapter II deals with the experimental part. It includes composition

of C-steel used, the preparation of the test specimens for the different techniques of measurements and method of preparation of materials of various solutions used. Also, the procedures followed for corrosion measurements, using weight loss, and polarization techniques are including in this chapter.

Chapter III deals with the corrosiOn inhibition of C-steel in acid chloride solution by some indole derivatives, under four subdivision parts. The first one involving the effect of the parent indole compound concentration, i.e.unsubstituted, on the corrosion inhibition of C-steel in acid chloride solution, 1 M HCI, using weight loss and polarization measurements .It was found that the increase of inhibitor concentration decreases both the corrosion• rate and corrosion current, i corr.