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08237 Corrosion Resistance of Si and Al Bearing Ultrafine Grained Weathering Steel in the Saline Atmosphere

Picture for 08237 Corrosion Resistance of Si and Al Bearing Ultrafine Grained Weathering Steel in the Saline Atm
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Product Number: 51300-08237-SG
ISBN: 08237 2008 CP
Author: Toshiyasu Nishimura and Sengodan Tamilselvi
Publication Date: 2008
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High Si and Al type ultrafine grained weathering steel was created by using the method of grain refinement and weathering guidance. It was found that this steel showed excellent properties in strength, toughness and corrosion resistance. The samples were made by the multi-pass warm rolling between 773K and 873K. The grain size of steel rolled at 873K was about 1 µm, and the tensile strength and the elongation were 800MPa and 20%, respectively. Cyclic wet/dry atmospheric corrosion tests using chloride ions confirmed that the developed steel exhibited better corrosion resistance than Si-Mn carbon steel (SM). The Electron Prove Microanalysis (EPMA) and Transmission Electron Microscope (TEM) analyses showed that Si and Al were mainly existed in the inner rust. Si and Al were identified as Si2+ and Al3+ state in the nano-scale complex oxides of inner rust. The Electrochemical Impedance Spectroscopy (EIS) measurement showed that the corrosion reaction resistance (Rt) of the developed steel was much larger than that of SM.
High Si and Al type ultrafine grained weathering steel was created by using the method of grain refinement and weathering guidance. It was found that this steel showed excellent properties in strength, toughness and corrosion resistance. The samples were made by the multi-pass warm rolling between 773K and 873K. The grain size of steel rolled at 873K was about 1 µm, and the tensile strength and the elongation were 800MPa and 20%, respectively. Cyclic wet/dry atmospheric corrosion tests using chloride ions confirmed that the developed steel exhibited better corrosion resistance than Si-Mn carbon steel (SM). The Electron Prove Microanalysis (EPMA) and Transmission Electron Microscope (TEM) analyses showed that Si and Al were mainly existed in the inner rust. Si and Al were identified as Si2+ and Al3+ state in the nano-scale complex oxides of inner rust. The Electrochemical Impedance Spectroscopy (EIS) measurement showed that the corrosion reaction resistance (Rt) of the developed steel was much larger than that of SM.
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