244 research outputs found
The influence of concentration and pH on corrotion rate in stainless steels – 316 solution HNO3 medium
The Influence of concentration and pH on corrosion rate on commercial
stainless steels-316 materials have been carried out. The experiments were carried
out in HNO3 medium with a concentration variation of 0.1 mol, 0.2 mol, 0.3 mol
and 0.4 mol corresponding to pH values of 1.0, 0.7, 0.523, and 0.4 respectively.
The experiments were carried out using a type M-273 EG&G galvanometer test
instrument. The post-corrosion samples’ microstructure has analyzed with the aid
of energy dispersive spectroscopy (EDS) equipped SEM instrument to detect the
presence of any viable corrosion by products. Experimental results confirm that
stainless steels-316 commercial alloys immersed in a nitric acid corrosion medium
with a variation of concentration experience very little or almost no corrosion and
that according to the so-called Fontana’s criteria these test-materials turn out to
have an excellent resistance toward nitric acid corrosion. This is also evidenced
by the very low corrosion rate value measured in this study. SEM-EDS study, lts
indicate that the possible ensuing corrosion by products are iron oxides, and
chrome oxides
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