The order of rate of corrosion of
metals also differed in every different liquid. The more dissimilar
the chemical characters of two liquids, the more diverse usually was
the order of rapidity of corrosion of a series of metals in them. The
order of rate of simple corrosion in any of the liquids examined
differed from that of chemico-electric and still more from that of
thermo-electric tension. Corrosion is not the cause of thermo-electric
action of metals in liquids.
Out of fifty-eight cases of rise of temperature the rate of ordinary
corrosion was increased in every instance except one, and that was
only a feeble exception--the increase of corrosion from 60 deg. to 160 deg. F.
with different metals was extremely variable, and was from 1.5 to 321.6
times. Whether a metal increased or decreased in thermo-electromotive
force by being heated, it increased in rapidity of corrosion. The
proportions in which the most corroded metal was also the most
thermo-electro-positive one was 65.57 per cent. in liquids at 60 deg.
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