Abstract
The electrochemical corrosion properties of 26Mn-3Si-3Al and 27Mn-4Si-2Al austenitic steels in two different states were studied in 0.1 M H2SO4 and 3.5% NaCl using potentiodynamic polarization tests. The effect of cold deformation on the microstructure and corrosion behavior of steels was analyzed. In acid solution, both steels exhibited lower corrosion resistance than in chloride solution independently on the steel state (hot-rolled, cold-worked). Cold deformation decreases the corrosion resistance, though this effect is smaller than the effect of chemical composition related to the combined Al + Si addition. All steels showed the evidence of pitting corrosion. The intensive dissolution of Fe and Mn takes place in the acid medium.
Highlights
Conventional Cr-Ni austenitic stainless steels are used as structural materials due to their excellent corrosion resistance and formability
The high-Mn steels are intensively world-wide investigated because of their superior combination of strength, ductility, and crashworthiness (Ref [4, 5]). These properties are due to the twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) phenomena resulting in an enhanced work hardening (Ref 5, 6)
It was reported that high-Mn steels show the lowest corrosion resistance in solutions of pH about 1 (Ref 6-8)
Summary
Conventional Cr-Ni austenitic stainless steels are used as structural materials due to their excellent corrosion resistance and formability These properties are related to the presence of chromium and nickel as alloying elements (Ref [1,2,3]). The high-Mn steels are intensively world-wide investigated because of their superior combination of strength, ductility, and crashworthiness (Ref [4, 5]) These properties are due to the twinning-induced plasticity (TWIP) or transformation-induced plasticity (TRIP) phenomena resulting in an enhanced work hardening (Ref [5, 6]). In addition to the automotive industry, the high-Mn steels can be used as replacements for traditional Cr-Ni steels for transportation of liquid gases These alloys are characterized by poor corrosion resistance because the Mn-alloyed austenite shows totally different corrosion properties than the classical Cr-Ni steels. There are still no systematic studies in the literature on their potentiodynamic behavior under conditions of plastic deformation as distinct from Cr-Ni stainless steels
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