Abstract:To investigate the impact of different rolling temperatures on the corrosion performance of low-density steel in marine environments, a self-designed Fe-30Mn-10Al-1.57C-0.3Si-0.6Ti low density steel was used as the research object. It was hot-rolled at different temperatures and comparative material of 40Cr was set up. The corrosion resistance of low-density steel was studied through testing methods such as full immersion weight loss test, potentiodynamic polarization curve, SEM and XPS analysis. The results show that as the rolling temperature increases, the weight loss of low-density steel decreases, the Ecorr increases from -0.691 V to -0.392 V, and the Icorr decreases from 10-5.533 A/cm2 to 10-6.780 A/cm2. It indicates that its corrosion resistance increases with the increase of rolling temperature. This is mainly due to the presence of Cr and Al in low-density steel, which leads to the formation of an oxide film on sample surface, preventing the corrosion of material matrix by corrosive medium. In addition, the low-density steel sample after hot rolling deformation treatment results in decrease in galvanic reaction due to decrease in ferrite content. This article enriches the relevant research on Fe-Mn-Al-C low density steel and provides theoretical basis for the industrial application of low-density steel.
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