New environmental regulations have substantially reduced the permissible level of sulfur oxide emissions from ocean vessels. An 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 resistant alloys. This study will build upon a previous study that compared the corrosion resistance of multiple corrosion resistant alloys in several simulated scrubber environments. The current study evaluates the effect of welding and the presence of a crevice on five alloys. The alloys include a common austenitic alloy, UNS S31603; two superaustenitic alloys, N08367 and N08031; and two Ni-Cr-Mo alloys, N10276 and N06059. 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, welding