Authors studied the corrosion tendencies of various structural materials including ferrous and non-ferrous alloys, plastics, rubbers and some protective films such as paint-films, metallizing, plating and electrocoating films (totally 286 specimens) in tanker cargo oil tanks by the spool test method.
The tests was performed during 430 days in tanker “Tsubame-Maru”, and her cargo oils were Middle-East crude oils.
The results obtained were as follows:
(1) Corrosion rates of plain steels and low alloy steels were about 0.06-0.14mm/yr, and austenitic stainless steels were superior in these conditions.
(2) Cu alloys and Cu-Ni alloys were sensitive in Middle-East crude oils and black copper sulfide films were remarkably recognized.
(3) Titanium and aluminum were most stable in tanker conditions.
(4) Among protective films tested urethan-resin base and Saran base paint-films were superior, and metallizing films were not resistant.
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