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In this paper,the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion,annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out.Microstructures and corrosion surface morphologies of the samples were observed by SEM.It was found that the retained β martensite and(α+κⅢ) lamella eutectoid in the as hot-extruded material were eliminated after annealing,and corrosion resistance of the alloy was improved.As to the as-quenched material,its corrosion rate was higher than that of the as hotextruded material since the volume fraction of β phase which was anodic to α phase increased after quenching.As regards the mechanical properties,the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples,while the as-annealed sample possesses the highest elongation.That is to say,heat treatment plays different roles in the mechanical properties and corrosion resistance of the experimental alloy.
In this paper, the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion, annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out. Microstructures and corrosion surface morphologies of the samples were observed by SEM. It was found that the retained β martensite and (α + κ Ⅲ) lamella eutectoid in the as-extruded material were eliminated after annealing, and the corrosion resistance of the alloy was improved. As to the as-quenched material, its corrosion rate was higher than that of as as hotextruded material since the volume fraction of β phase which was anodic to α phase increased after quenching. As regards the mechanical properties, the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples, while the as-annealed sample possesses the highest elongation.That is to say, heat treatment pla ys different roles in the mechanical properties and corrosion resistance of the experimental alloy.