Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin
Pure zinc bars with different deformation degree were prepared by hot rolling.The effect of deformation degree on the microstructure and corrosion properties of pure zinc in a leaching solution of soil at Tianjin were studied by electrochemical test,immersion accelerating corrosion test and metallo-graphic characterization.The results showed that the cast pure zinc had a coarse microstructure with a large number of fine sub-grains and casting twins.The primary grains of zinc were obviously refined,while the sub-grains were merged and grown with the increase of plastic deformation degree.The cast twins were significantly reduced as the deformation degree increased.The pitting potential and passiv-ation interval of pure zinc in the soil leaching solution increased with the increase of deformation degree.While the corrosion current density and passivation current density decreased as the deformation degree increased.The resistance of passive film and the charge transfer resistance of corrosion process of zinc obviously increased after plastic deformation treatment.The continuously improved metallographic homo-geneity of pure zinc,which resulted from the increased plastic deformation degree could enhance the cor-rosion resistance of pure zinc in the soil leaching solution.
pure zincplastic processingmetallographic structureelectrochemistrysoil corrosion
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维普
