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97149 Dewpoint Corrosion Resistance of Ni-Based High Performance Alloys

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Product Number: 51300-97149-SG
ISBN: 97149 1997 CP
Author: Katsuo Sugahara, Yoshio Takizawa
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Recently, a new corrosion resistant Ni-Cr-Mo-Ta alloy, MAT-21, alloy T, was developed with improved corrosion resistance to sulfuric acid dewpoint corrosion which occurs in fossil fuel-fired power plants. Under conditions simulating acid dewpoint corrosion in waste incinerator flue gases, EillOY T, which was composed of 1970 chromium, 19% molybdenum, 1.8% tantalum and the balance nickel, was compared with the conventional Ni-based high performance alloys such as alloys C-276, 686 and 59. The corrosion tests showed that alloy T had excellent corrosion resistance to acid dewpoint corrosion in waste incinerators. The general and localized corrosion resistance behavior of alloys T, C-276, 686 and 59 was tested in different candidate solutions such as sulfuric acid and hydrochloric acid solutions, sulfuric-hydrochloric acid mixtures, hydrofluoric acid solutions in low concentrations, and the Green Death solution. Among these alloys, alloy T was the most resistant in these tests in the laboratory. Moreover, the corrosion resistance of welded joints of alloy T did not degrade in the as-welded condition. Keywords: waste incinerator, dewpoint corrosion, Ni based alloy, sulfuric acid, hydrochloric acid, hydrofluoric acid, localized corrosion
Recently, a new corrosion resistant Ni-Cr-Mo-Ta alloy, MAT-21, alloy T, was developed with improved corrosion resistance to sulfuric acid dewpoint corrosion which occurs in fossil fuel-fired power plants. Under conditions simulating acid dewpoint corrosion in waste incinerator flue gases, EillOY T, which was composed of 1970 chromium, 19% molybdenum, 1.8% tantalum and the balance nickel, was compared with the conventional Ni-based high performance alloys such as alloys C-276, 686 and 59. The corrosion tests showed that alloy T had excellent corrosion resistance to acid dewpoint corrosion in waste incinerators. The general and localized corrosion resistance behavior of alloys T, C-276, 686 and 59 was tested in different candidate solutions such as sulfuric acid and hydrochloric acid solutions, sulfuric-hydrochloric acid mixtures, hydrofluoric acid solutions in low concentrations, and the Green Death solution. Among these alloys, alloy T was the most resistant in these tests in the laboratory. Moreover, the corrosion resistance of welded joints of alloy T did not degrade in the as-welded condition. Keywords: waste incinerator, dewpoint corrosion, Ni based alloy, sulfuric acid, hydrochloric acid, hydrofluoric acid, localized corrosion
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