Electrochemical behaviour of iron and AISI 304 stainless steel in simulated acid rain solution

Abstract

The growth mechanism and properties of the oxide films on iron and AISI 304 stainless steel were studied in simulated acid rain (pH 4.5) by means of electrochemical techniques and atomic absorption spectrometry. The layer-pore resistance model was applied to explain a potentiodynamic formation of surface oxides. It was found that the growth of the oxide film on iron takes place by the low-field migration mechanism, while that on the stainless steel takes place by the high-field mechanism. Kinetic parameters were determined. Impedance measurements revealed that Fe surface film has no protective properties at the open circuit potential, while the resistance of stainless steel oxide film is very high. The concentration of the metallic ions released into solution and measured by atomic absorption spectroscopy was in accordance with the results obtained from the electrochemical techniques.

Effect of Helichrysum italicum on the Electrochemical Corrosion Behaviour of Iron in Simulated Acid Rain Solution

“…They are related to the reduction of Fe(III) to Fe(II) and Fe(II) to Fe(0), respectively. Our previous research [5] showed that the reduction of anodically formed oxide layer is not complete.…”

“…[1][2][3] The main limitation for their applications is a corrosion attack. [4][5][6][7] The corrosion behaviour of metals and alloys primarily depends on the properties of the surface oxide layer. It is generally accepted that the passive film on the iron consists basically of a Fe(III) layer [4,6,7] and a good corrosion resistance of stainless steels lies in their ability to form a chromium-rich protective oxide layer, commonly called a passive film.…”

“…It is generally accepted that the passive film on the iron consists basically of a Fe(III) layer [4,6,7] and a good corrosion resistance of stainless steels lies in their ability to form a chromium-rich protective oxide layer, commonly called a passive film. [5,8] The stability of the oxide film depends on a large number of variables, such as temperature, chemical composition and pH of the electrolyte. [9][10][11][12] Corrosion of metals and alloys particularly in an acidic media is an important industrial problem and primarily cause a breakdown of the oxide layer.…”

“…The purpose of the present work is to evaluate the inhibitive effect of the Helichrysum italicum (Roth) G. Don as a green corrosion inhibitor of the iron in an acid rain. In our earlier paper [5] we studied an electrochemical behaviour of iron and AISI 304 stainless steel in an acid rain solution (pH 4.5). This study is a continuation of electrochemical investigations of the iron in an acid rain in the presence of the Helichrysum italicum (HI) as a potential corrosion inhibitor.…”

The anti-corrosion behaviour of Satureja montana L. extract on iron in NaCl solution

“…Many metals and alloys are an important category of materials due to the various industrial applications and economic importance but they are susceptible to different mechanisms of corrosion due to their exposure to different corrosive media [1][2][3][4]. The corrosion behaviour of these materials depends of the oxide layer on metal surface and a great number of corrosion investigations performed using different techniques: electrochemical [3,4], SERS [5,6], XANES [7,8] etc., have been focused on the surface film. Because of the general aggressiveness of chloridecontaining solution [9][10] corrosion control is an essential issue from application point of view.…”