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01172 THE ROLE OF ALLOYING ELEMENTS ON THE CORROSION IN OXIDIZING AND CHLORIDIZING GASES

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Product Number: 51300-01172-SG
ISBN: 01172 2001 CP
Author: M. Spiegel, A.Zahs, HJ. Grabke
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The effect of alloying elements Cr, Ti, Mo, A1 and Si on the corrosion behaviour of ferritic Fe-15Cr model alloys was studied in an N2-5 vol.% O2 gas mixture with addition of 500 and 1500 vppm HCI by means of thermogravimetric experiments at 600 °C. The specific morphology of the corrosion products as well as the corrosive attack by 'active oxidation' strongly depends on the nature of the alloying elements. Fe-(15-25) wt. % Cr alloys without any further addition of alloying elements show catastrophic 'active oxidation', characterized by the formation of metal-chlorides at the metal-oxide interface. Volatilization and subsequent conversion into oxides results in the formation of thick, porous oxide layers. For the Fe-15Cr model alloys, the addition of molybdenum and silicon generally decreases the corrosive attack, whereas Ti had no beneficial effect and the corrosion was increased compared to Fe-15Cr. A beneficial effect of aluminium was only observed at low flowing velocities of the gaseous atmosphere. Keywords: Fe-Cr-alloys, alloying elements, chlorine induced corrosion, active oxidation
The effect of alloying elements Cr, Ti, Mo, A1 and Si on the corrosion behaviour of ferritic Fe-15Cr model alloys was studied in an N2-5 vol.% O2 gas mixture with addition of 500 and 1500 vppm HCI by means of thermogravimetric experiments at 600 °C. The specific morphology of the corrosion products as well as the corrosive attack by 'active oxidation' strongly depends on the nature of the alloying elements. Fe-(15-25) wt. % Cr alloys without any further addition of alloying elements show catastrophic 'active oxidation', characterized by the formation of metal-chlorides at the metal-oxide interface. Volatilization and subsequent conversion into oxides results in the formation of thick, porous oxide layers. For the Fe-15Cr model alloys, the addition of molybdenum and silicon generally decreases the corrosive attack, whereas Ti had no beneficial effect and the corrosion was increased compared to Fe-15Cr. A beneficial effect of aluminium was only observed at low flowing velocities of the gaseous atmosphere. Keywords: Fe-Cr-alloys, alloying elements, chlorine induced corrosion, active oxidation
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