アルミニウム合金および炭素鋼の耐食性に及ぼすチタン微粒子衝突処理の効果

概要

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This study investigated effect of titanium-fine-particle bombarding (Ti-FPB) treatment on corrosion resistance of A7075-T6 aluminum alloy and S45C carbon steel. Ti-FPB treatment is a surface-modification method to bombard countless titanium-fine-particles accelerated to high speed to the materials. After the treatment was conducted on the materials, the characteristics of the formed surface layers were examined in detail. As a result, it was shown that titanium composing the fine-particles was diffused over the surfaces because kinetic energy of the fine-particles was converted to thermal energy and the surface temperature was rapidly increased. At the same time, the surface hardness was remarkably increased and compressive residual stress was introduced. Further, the Ti-FPBed materials were immersed in 5 mass% salt-water maintained at 353 K. In this test, the specimens were fixed under stress of 80% of the yield strength. The results showed that the diffused titanium through Ti-FPB treatment improved the corrosion resistance of A7075-T6 alloy and S45C steel and the reduction in the tensile strength and elongation was suppressed.