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Permissible level of sulfur emissions from ocean vessels have been reduced. Diesel exhaust scrubbers are one response. The scrubber environment requires corrosion resistant alloys. This study compares multiple alloys in several simulated scrubber environments.
New environmental regulations reduce the permissible level of sulfur emissions from ocean vessels. Frequently the most economical means of meeting the regulations is through the use of a diesel exhaust scrubber. The scrubber environment includes chlorides high temperatures and acidic conditions and requires the use of corrosion resistance alloys. This study compares several alloys (Alloy 316L (UNS S31603) AL-6XN® Alloy (UNS N08367) Alloy 31 (UNS N08031) Alloy 276 (UNS N10276) Alloy 59 (UNS N06059) Grade 2 Ti (UNS R50400) and ATI 425® Alloy Grade 38 Ti (UNS R54250)) in several simulated scrubber environments. These comparisons are essential for proper material selection as the demand for marine exhaust scrubbers grows to meet the new regulations.
Key words: ASTM G48, marine, scrubber, stainless steels, nickel alloys, pitting corrosion, crevice corrosion, localized corrosion
Builds upon a previous study that compared the corrosion resistance of multiple corrosion resistant alloys in several simulated (marine exhaust) scrubber environments.
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This paper will present two case studies of pre-mature failure of process equipment in seawater service which will illustrate the influence of metallurgical structure on the service performance of Nickel-Aluminum Bronze in marine environments.
Case histories will illustrate failures that occurred in components that were made of different brass alloys in water and steam systems. Recommendations will be made to mitigate the damage that occurred in each case.