The effect of scanning rate on the AA 5083 electrochemical behavior in 3.5% NaCl solution has been investigated using measurements of potentiodynamic polarization and cyclic polarization experiment. The results showed that when the scanning rate was in the range of 0.2mV/s to 5.0mV/s, the influence on the potential of pitting Epit was small, thus the scanning rate 0.5mV/s was selected. The pitting originated from intermetallic inclusions Mg2Si and resulted in corrosion of aluminium matrix adjacent to the inclusions. Experiment revealed that decrease in the chloride concentration slightly shifted both the pitting Epit and corrosion potentials Ecorr to more active values. But the effect was changed slight when the chloride concentration exceed to 1.0%.
The metallurgy quality of the steel was improved greatly by calcium treatment which was a technique developed for a long time. The Mn steels treated with calcium, carbon-manganese steels and nickel-chromium steels were collected and their corrosion behaviors were investigated. The results showed that the corrosion resistance of the Mn steel is lower than that of the Ni-Cr steel. The shape of the inclusions can be modified and quality of the steels can be enhanced by the calcium treatment, and the corrosion resistance of the steel treated with calcium is higher than that of the common carbon-Mn steel, and near to that of the NiCr steel.
Two low alloy steels were selected. Inclusions in them were analyzed by electronic probe micro-analyzer. The Influence of inclusions in low alloy-steels were discussed by polarization tests and simulated occluded corrosion cell combined with micro-analyse. The results showed that the inclusions in low alloy-steels were the main pitting initiation and the sulfide inclusions were easier to cause pitting corrosion than other inclusions. The inclusions also accelerated pitting corrosion propagating.
This study focused on the effect of antimony on the corrosion resistance of low alloy steel using electrochemical techniques such as dynamic scanning and EIS and immersion test in an acid solution with high chloride concentration. The potentiodynamic test showed the anodic and cathodic corrosion behavior of all specimens and the corrosion rate decreased with increasing antimony addition. EIS showed that the antimony-containing steels had higher rust layer resistance. These test results showed the addition of antimony was convenient to the enhancement of corrosion resistance of the steel in the acid solution with high chloride concentration. The tests proved that the content of antimony controlled to 0.12% in the steel showed the best corrosion resistance.
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