【摘要】：目的提高純鈦表面的耐腐蝕性能。方法本實驗主要分兩步進行,首先進行金相樣品的制備,然后利用強流脈沖電子束對材料表面進行改性處理,最后利用掃描電鏡(SEM)、X射線衍射儀(XRD)、硬度檢測,電化學檢測等檢測手段進行探討研究。結(jié)果掃描電鏡分析結(jié)果表明,強流脈沖電子束處理后,樣品表面出現(xiàn)了熔坑,并且隨著脈沖次數(shù)的增加,熔坑數(shù)量逐漸減少,這主要歸因于強流脈沖電子束的凈化除雜作用。X射線衍射分析發(fā)現(xiàn),強流脈沖電子束處理后,衍射峰出現(xiàn)了寬化和向高角度偏移現(xiàn)象,主要歸因于脈沖處理后合金表面的晶粒細化和表面應(yīng)力、晶格常數(shù)的降低。另外,電化學測試表明,強流脈沖電子束處理后金屬表面的耐腐蝕性明顯增加,自腐蝕電流密度從強流脈沖電子束處理前的27.3μA/cm~2變化到25次脈沖處理后的6.3μA/cm~2,主要歸因于強流脈沖電子束的凈化除雜作用以及熔坑等結(jié)構(gòu)缺陷的消失。顯微硬度分析發(fā)現(xiàn),經(jīng)過強流脈沖電子束處理后由于樣品表面的殘余應(yīng)力和孿晶等結(jié)構(gòu)缺陷的存在,樣品表面硬度明顯降低。結(jié)論強流脈沖電子束處理后,純鈦的耐腐蝕性能增加,晶粒細化,硬度有所降低。
[Abstract]:Objective to improve the corrosion resistance of pure titanium surface. Methods the experiment was carried out in two steps. Firstly, the metallographic sample was prepared, then the surface of the material was modified by high current pulsed electron beam. Finally, the hardness of the material was measured by (SEM), X-ray diffractometer (XRD),) with scanning electron microscope (SEM). Electrochemical detection and other detection methods were discussed. Results the results of SEM analysis showed that after high current pulsed electron beam treatment, the weld pits appeared on the surface of the samples, and with the increase of pulse times, the number of craters decreased gradually. X-ray diffraction analysis shows that the diffraction peak is broadened and shifted to high angle after high-current pulsed electron beam treatment, and X-ray diffraction analysis shows that the high-current pulsed electron beam can be used to remove the impurity by high-current pulsed electron beam. It is mainly due to the grain refinement and surface stress and the decrease of lattice constant on the surface of the alloy after pulse treatment. In addition, electrochemical tests showed that the corrosion resistance of the metal surface was significantly increased after high current pulsed electron beam treatment, and the self corrosion current density changed from 27.3 渭 A / cm~2 before high current pulsed electron beam treatment to 6.3 渭 A / cm~2, after 25 times pulsed electron beam treatment. It is mainly due to the removal of impurity by high-current pulsed electron beam and the disappearance of structural defects such as melting pits. Microhardness analysis shows that after high current pulsed electron beam treatment, the surface hardness of samples decreases obviously due to the presence of structural defects such as residual stress and twinning on the sample surface. Conclusion after high current pulsed electron beam treatment, the corrosion resistance of pure titanium increases, the grain size is refined and the hardness is decreased.
【作者單位】： 東北大學冶金學院;
【基金】：國家自然科學基金(51671052)~~
【分類號】：TG146.23

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