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The influence of trace SO 2 in simulated automotive exhaust gases at 400°C on the oxidation and subsequent condensate corrosion of 409 stainless steel was investigated by means of mass gain, SEM, Raman spectroscopy, GDOES, Mott–Schottky and polarisation curves. SO 2 suppresses the growth of oxide films, especially nodular oxides rich in magnetite and maghemite, due to forming sulphates...
Homogenised AlGa model binary alloys, prepared from pure components and containing 50–1000ppm by weight Ga, were heat-treated further in the temperature range 300–600°C. Electrochemical polarisation tests in 5wt% NaCl solution did not indicate anodic activation, since Ga remained stable in the solid solution alloy as long as passivity breakdown did not occur by applying potentials above the critical...
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