Semiconducting Behavior of Carbon Steel in Electrolyte Solution

Abstract

Abstract:In this paper, the semiconducting behavior of carbon steel in acid, base and salt solutions was studied by utilizing potential-capacitance and Mott-Schottky analysis. It was pointed out that the capacitance variation of space charge layer of carbon steel in different solution was different. The carbon steel showed p-type semiconducting behavior in 5% sulfuric acid and 5% sodium sulfate solution. However, the carbon steel showed n-type semiconducting behavior in 5% sodium hydroxide. It was suggested that the space charge layer of the carbon steel in different electrolytes might be asymmetric.

Semiconducting Behavior of Organic Polymer Coating during its Degradation in 5‰ Sulfuric Acid Solution

“…4, it was obviously that the density of charge carriers of the phenol aldehyde resin coating had an inclination of increasing with increasing immersion time. Compared with results of naked carbon steel, the density of charge carriers in the phenol aldehyde resin coating was smaller than naked electrode [8].…”

“…3. ), the capacitance of the alkyd resin coated electrode was also much lower than that of naked carbon steel electrode [8], but was three orders of magnitude higher than that of above-mentioned two polymer samples. This suggested that the thickness of the depletion layer for carbon steel/alkyd resin/electrolyte system was much higher than that of carbon steel/electrolyte system, but was three orders of magnitude less than that of above-mentioned two polymer samples.…”

“…1. ), the capacitance of the coated electrode was much lower than that of naked carbon steel electrode [8], this suggested that the thickness of the depletion layer for carbon steel/polymer coating/electrolyte system was much higher than that of carbon steel/electrolyte system. At the early stage of immersion of 10 minutes, the capacitance of the coated electrode was ultra small and nearly constant along with increasing potential.…”

“…The Mott-Schottky relationship of (1/C sc ) 2 vs. U expressed the potential and a set of impedance values of all electrode samples varied with potential and immersion time were also obtained from capacitance measurements [8]. The capacitance-potential curves of polymer coated electrodes showed capacitance variation with immersion in 5‰ sulfuric acid solution (Fig.…”

Novel Electrochemical Behavior of Organic Polymer Coating in Alkaline Solution

“…How about the organic polymer coating in alkaline solution, and its conducting mechanism, these need for further studies. In our previous study of the semiconducting behaviour of temporarily protective oil coating(TPOC) [8] , 304 stainless steel [9] , carbon steel [10] . In this paper, we utilized capacitance measurement with Mott-Schottky analysis to study the conducting behaviour of carbon steel coated with polymer coating in 5% sodium hydroxide solution.…”