Studies on the Corrosion Properties of High-Mn Austenitic Steels

Abstract

Institute of Materials Science at Silesian University of Technology since 6 years conducts researches to learn about the new dedicated for automotive, railway and military industries. Some of these materials belong to the group of AHS steels, characterized by the twinning induced plasticity (TWIP) effect. It is a new type of steel possessing both a high strength and a great plastic elongation, and an ideal uniform work hardening behaviour. It is therefore a good candidate for deep drawing applications in the automobile and railway industries. In the paper the of the three grades of high-manganese steels of was studied in 3.5% NaCl solution and in an “acid rain” solution with pH=3.5 environments using polarization experiments. The results of corrosion tests and analysis of show that a higher polarisation resistance and lower values of corrosion current density are observed for all studied steels in 3.5% NaCl solution. Spontaneous passivation ability has been shown only for one grade of high-manganese steel in 3.5% NaCl.

Corrosion Resistance and Pitting Behaviour of Low-Carbon High-Mn Steels in Chloride Solution

“…4a). It confirms our earlier results of potentiodynamic tests [14] and supports the data reported by other authors [12][13][14][15][24][25][26]. The values of corrosion potential are similar for thermomechanically treated and cold deformed specimens (Fig.…”

The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels

“…Corrosion potential value oscillated a −700 mV for all the experimental samples, however, the lowest average Ecorr wa orded for 6Al-4Mn steel (−733 mV) and the highest for 1.5Al-1.5Mn (−680 mV). Nev less, in comparison to earlier high alloyed high strength steel grades with a similar A ratio, the results show a considerable improvement in the corrosion resistance of th terials [9,11,12,[27][28][29][30][31][32]. For instance, Shih et al [28] reported corrosion rates 580 µm and 570 µm•year −1 for Fe-24.4Mn-9.96Al-0.40C and Fe-30.7Mn-13.03Al-0.44C allo spectively, which were subjected to potentiodynamic testing in 3.5% NaCl solutio guably, the improved corrosion resistance of the studied steels can also be attribu relatively low manganese content (1.5 to 4 wt.%), which decreased the significance soluble corrosion products of manganese [10,12,33].…”

Corrosion Mechanisms of High-Mn Twinning-Induced Plasticity (TWIP) Steels: A Critical Review

“…Austenitic Fe−17Mn−3Al−0.24C, Fe−21Mn−3.5Al−0.29C, and Fe−27Mn−5Al−0.57C steels were studied by Jablonska and Michalik in 3.5 wt.% NaCl solution, and in acid rain solution (molar ratio H 2 SO 4 :HNO 3 :HCl as 1:0.3:0.17) (pH 3.5) [78]. The three steel grades displayed increased corrosion resistance in chloride solution compared to the acid rain solution.…”