An XPS study of the adsorption of organic inhibitors on mild steel surfaces

The thermodynamic properties and characterizations of corrosion inhibition of chitosan nano-particles on the surface of mild steel in peat water media had been studied using weight loss method at temperatures of 30 - 50 oC. Steel surfaces were characterized by FT-IR spectra and SEM-EDS morphology photos. The research found that the value of DGo approaching -40 kJmol-1. The negative value of Gibbs free energy shows that the adsorption of inhibitor molecules on the surface of mild steel was achemisorption and it occurred spontaneously. Meanwhile, the values of DHo is also negative confirming that the adsoprtion of inhibitor molecules is an exothermic process. The value of DSo obtained is positive, it indicates hat the inhibitor molecules were adsorbed spontaneously on the mild steel surface. The analysis on mild steel surfaces hows that the nano-particle chitosan was adsorbed on the steel surface to form the complex compounds.

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Simulating Microbiologically Influenced Corrosion by Depositing Extracellular Biopolymers on Mild Steel Surfaces

CORROSION ◽

10.5006/1.3292067 ◽

1996 ◽

Vol 52 (10) ◽

pp. 744-752 ◽

Cited By ~ 27

Author(s):

F. L. Roe ◽

Z. Lewandowski ◽

T. Funk

Keyword(s):

Mild Steel ◽

Microbiologically Influenced Corrosion ◽

Steel Surfaces

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Numerical Prediction of Erosion of Mild Steel Surfaces by Boiler Fly Ash Particles

Volume 1 ◽

10.1115/esda2004-58074 ◽

2004 ◽

Author(s):

John G. Mbabazi ◽

Thomas J. Sheer

Keyword(s):

Fly Ash ◽

Mild Steel ◽

Flue Gas ◽

Gas Flow ◽

Erosive Wear ◽

Test Facility ◽

Experimental Investigations ◽

Power Station ◽

Erosion Rates ◽

Steel Surfaces

Fly ash particles entrained in the flue gas from boiler furnaces in coal-fired power stations can cause serious erosive wear on steel surfaces along the downstream flow path. This paper describes research into fly ash impingement erosion on such surfaces, with particular reference to the heat transfer plates in rotary regenerative air heaters. The effect of the ash particle impact velocity and impact angle on the erosive wear of mild steel surfaces was determined through experimental investigations, using three different power station ash types. The experimental data were used to calibrate a fundamentally-derived model for the prediction of erosion rates. This erosion model was incorporated into a particle-tracking CFD flow simulation of the ash-laden flue gas flow through the complex channels between corrugated air heater plates. The predicted erosion rates were compared with measured erosion rates obtained using a large accelerated-erosion test facility located at a power station. Good agreement was obtained, the predictions generally being within 20 percent of the measured values.

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Recent Natural Corrosion Inhibitors for Mild Steel: An Overview

Journal of Chemistry ◽

10.1155/2016/6208937 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 40

Author(s):

Marko Chigondo ◽

Fidelis Chigondo

Keyword(s):

Mild Steel ◽

Corrosion Inhibitors ◽

Impurity Content ◽

Environmentally Benign ◽

Acidic Solutions ◽

Treatment Techniques ◽

Organic Inhibitors ◽

Prevention Methods ◽

Metallic Corrosion ◽

Work Done

Traditionally, reduction of corrosion has been managed by various methods including cathodic protection, process control, reduction of the metal impurity content, and application of surface treatment techniques, as well as incorporation of suitable alloys. However, the use of corrosion inhibitors has proven to be the easiest and cheapest method for corrosion protection and prevention in acidic media. These inhibitors slow down the corrosion rate and thus prevent monetary losses due to metallic corrosion on industrial vessels, equipment, or surfaces. Inorganic and organic inhibitors are toxic and costly and thus recent focus has been turned to develop environmentally benign methods for corrosion retardation. Many researchers have recently focused on corrosion prevention methods using green inhibitors for mild steel in acidic solutions to mimic industrial processes. This paper provides an overview of types of corrosion, corrosion process, and mainly recent work done on the application of natural plant extracts as corrosion inhibitors for mild steel.

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