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9. Corrosion and Electrochemical Behavior of
Martensitic-Austenitic Stainless Steel in Hydrochloric Acid
Solutions
M.M.
Sadawy1,2*; T.U. Shirinov2;R.G. Heseinov2
1-Mining and Pet. Eng. dep., Faculty of Eng., Al-Azhar Univ.
2-Technology of construction and composite materials dep., Faculty
of metallurgy, Technical Univ., Baku *E-mail:
mosaadsadawy@yahoo.com
Abstract:
Corrosion and Electrochemical behavior of martensitic-austenitic
stainless steel was investigated in 0.5,1,3 and 5wt. % HCl
solutions by weight loss and electrochemical methods. The
results indicated that the increase of acid concentration shifts
the corrosion potential to more negative values and increasing
the corrosion current. Also the results showed that this steel
has a passive region in 0.5 and 1 wt. % HCl while the passivity
disappeared completely in 3 and 5wt. % HCl. On the other hand
the morphology of surface after corrosion tests indicated that
this type of steel suffers from pitting corrosion.
Keywords:
Martensitic-austenitic steel, potentiodynamic polarization,
passive region
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