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96413 Development of A New Corrosion Resistant Ni-Cr-Mo-Ta Alloy with Improved Corrosion Resistance to Sulfur Dewpoint Corrosion

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Product Number: 51300-96413-SG
ISBN: 96413 1996 CP
Author: Katsuo Sugahara, Yoshio Takizawa
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A new corrosion resistant Ni-Cr-Mo-Ta alloy has been developed with improved corrosion resistance to sulfur dewpoint corrosion. The corrosion tests show that this alloy can be used for heat-exchangers to recover waste heat at low temperatures in fossil fuelfired power plants. This new alloy, which is composed of 20% chromium, 20% molybdenum, 20% tantalum and balance nickel, shows excellent corrosion resistance to sulfur dewpoint corrosion. The general and localized corrosion resistance behavior of this new alloy has been tested in different candidate solutions such as sulfuric acid solutions with and without active carbon powder, sulfuric-hydrochloric acid mixtures, ASTM G-28 Method B, and Green Death solution. Very excellent corrosion resistance performance against these tests has been shown in the laboratory. Moreover the corrosion resistance of welded joints does not degrade in the as welded condition. Keywords: Nickel based alloy, alloy development, dewpoint corrosion, flue gas, sulfuric acid, hydrochloric acid, active carbon
A new corrosion resistant Ni-Cr-Mo-Ta alloy has been developed with improved corrosion resistance to sulfur dewpoint corrosion. The corrosion tests show that this alloy can be used for heat-exchangers to recover waste heat at low temperatures in fossil fuelfired power plants. This new alloy, which is composed of 20% chromium, 20% molybdenum, 20% tantalum and balance nickel, shows excellent corrosion resistance to sulfur dewpoint corrosion. The general and localized corrosion resistance behavior of this new alloy has been tested in different candidate solutions such as sulfuric acid solutions with and without active carbon powder, sulfuric-hydrochloric acid mixtures, ASTM G-28 Method B, and Green Death solution. Very excellent corrosion resistance performance against these tests has been shown in the laboratory. Moreover the corrosion resistance of welded joints does not degrade in the as welded condition. Keywords: Nickel based alloy, alloy development, dewpoint corrosion, flue gas, sulfuric acid, hydrochloric acid, active carbon
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