Effects of naturally-progressed corrosion on the chemical and mechanical properties of structural steels (original) (raw)
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Bulletin of the Chemical Society of Ethiopia, 2015
The corrosion behavior of three constructional steels used in Senegal, S235, S275 and S355, was studied in simulated atmospheric conditions in an exposure chamber above distilled water and above 3% NaCl solution representing marine atmosphere by comparing the ratio of rusted to unrusted area. Electrochemical test methods (potentiodynamic tests and electrochemical impedance spectroscopy) were employed to study the steels fully immersed in acidic, near neutral and basic conditions in 0.5 M HCl, NaCl, and NaOH solutions, respectively. Results indicate that S355 and S235 steels have comparable corrosion resistance, which are much lower than that of S275.
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The aim of the present study is to experimentally examine the corrosion progress characteristics of steel associated with fresh and sea water immersion at low temperature. Three types of steel, namely mild steel (Grade A) and high tensile steel (Grades A and D) are tested under various corrosive conditions in the fresh water, in the sea water and in the air at a temperature of 18°C, 0°C and −10°C. Mass loss of test specimen due to corrosion is measured at a monthly interval and it is converted to a loss of steel plate thickness. Based on the test database, the effects of parameters affecting the corrosion progress are discussed. Test database obtained in the present study is documented.
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Corrosion testing is an essential tool in the development of corrosion protection strategies. Its prominence cannot be overlooked in this world of limited resources. Accelerated tests including the alternate immersion test and the simple immersion test, were performed according to ISO 11130 and ASTM G31 to study the corrosion behaviour of mild steel. A time correlation has been established between these tests and the corrosion categories of ISO 9223 to get an idea about the testing period for a particular amount of expected corrosion loss in a specific atmosphere. They were also compared with atmospheric exposures at a marine site in Mauritius. Test specimens were visually inspected to understand the corrosion behaviour in these accelerated tests. The study concluded that a concentration other than 3.5% NaCl should be envisaged for the alternate immersion test to at least follow a trend similar to that of atmospheric corrosion.
Studies on The Corrosion Behaviour of Mild-Steel Under Simulated Industrial Conditions
2015
Corrosion is the deterioration of physical properties of the material due to a reaction with its environment. It converts refined metal to their more stable oxide. Corrosion of the material will depends on mainly on two factors the material of construction and the environment present. In the present study, an attempt has been made to find the responsible factors in both the aqueous environment and the material of construction. Characterization of the water used for the quenching purpose in Rourkela Steel Plant, Odisha yielded the list of contaminants present in it. The effect of the presence of these compounds on the rate of corrosion has been studied by performing experiments using simulated quenching processing water which is later affirmed by the literature available. The reference level used for the study is taken from the reported literature values as well as from the obtained experimental results. The single effects as well as the combined effects of the water quality paramete...
UCTEA Chamber Of Metallurgical and Materials Engineers, 2021
Corrosion-induced degradation of marine steel structures is highly dependent on the surrounding environmental conditions and so varies significantly around global seawaters. This research has investigated the dependence of corrosion of carbon steel alloy for marine service on seawater composition and climatic conditions typical of the Arabian Sea. Natural and polluted seawater sites in the Arabian Sea were selected for field exposures. In addition, environmental conditions spanning those anticipated for the shipping structures operating in the Arabian Sea have been simulated in laboratorybased experiments by using heated and aerated artificial seawater. Following their exposures, the performance of samples have been investigated using the weight-loss and dimensional metrology methods. High overall corrosion losses were observed in the polluted seawaters than in the natural seawater conditions of Arabian Sea.
CORROSION IN INDUSTRIAL STEEL STRUCTURES AND MITIGATION
insdag year book, 2021
The subject of corrosion is associated with many aspects of various branches of chemistry, metallurgy, metal physics, and bacteriology. Scientific studies have revealed that few billions of dollars of national wealth are lost annually due to corrosion of metals of daily use. Reasons of many premature failures of metallic structures and components are due to undeterred corrosion of metal parts. With the advancement of material science, the causes and control of many aspects of corrosion have been established but even then, the corrosion science is still under investigation and will continue to be so due to the inherent complexity. The article presents a brief outline only on atmospheric corrosion of iron and steel, a the most common engineering metal and the simplest form of protection by use of selective painting/organic coatings.
Recreation of Marine Atmospheric Corrosion Condition on Weathering Steel in Laboratory
Journal of The Institution of Engineers (India): Series D, 2014
Salt spray test, autoclave corrosion test, SO 2 salt spray test, and Relative humidity test are generally used to assess atmospheric corrosion in laboratories at accelerated rates. However, no test can absolutely simulate the service condition. One can get only approximate corrosion rates using the aforesaid tests which serve as an indicative of corrosion behavior of the material in a service condition. The present work is aimed at creating specific environmental condition in laboratory to get the corrosion test done in short duration to compare with on field exposure test which would otherwise take years to complete. In this work recreation of atmospheric environment of Digha was tried and it was simulated in such a manner that the results of laboratory test could be compared with long time field exposure at Digha. Weathering steel (WS) was taken for experimentations. Potentiostatic electrochemical tests route was adopted to simulate atmospheric condition of Digha. Laboratory test results compared well with 18 month field exposure data in terms of corrosion rate, SEM and Ramon Spectroscopy matching.
This paper assesses the use of wet/dry cyclic laboratory corrosion tests that can provide information on the protective capacity of weathering steels in short times. Two steels were considered, a weathering steel ASTM A 242 Type 1 and a plain carbon steel (as reference), that were exposed in the atmosphere of Madrid (3 years) and in the following laboratory wet/dry cyclic tests: Cebelcor (104 M Na2SO4) (945 h), Kesternich (0.2 L SO2) (2160 h) and Prohesion (2160 h). Characterisation of rust layers was done by XRD, FTIR, SEM, SKP and EIS. Wet/dry cyclic tests make it possible to shorten the testing time to assess in laboratory the protective capacity of rusts formed on weathering steels in the atmosphere. Some analogies between experimentation in the field and in the laboratory have been established.