Mechanical characteristics and electrochemical behaviour of electrodeposited nanocrystalline iron and iron-nickel alloy
Mechanical characteristics and electrochemical behaviour of electrodeposited nanocrystalline iron and iron-nickel alloy
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DOI：
10.1016/j.matchemphys.2017.08.025
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发表时间：
2017-11
影响因子：
4.6
通讯作者：
D. V. Kumar;S. Ayyagari;M. Prasad
中科院分区：
文献类型：
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作者：
D. V. Kumar;S. Ayyagari;M. Prasad
无间隙原子（IF）钢表现出高的可成形性，但相对较低的强度和较差的耐磨性，而纳米晶材料由于其高的晶界面积而提供优异的机械性能。本研究旨在将纳米晶材料以硬涂层的形式合并到IF钢中，以评估耐磨性和耐腐蚀性。采用脉冲电沉积法制备了晶粒尺寸约为25 nm的纳米晶Fe和Fe-Ni合金，研究了其微观磨损和电化学行为。与IF钢相比，纳米晶Fe和Fe-Ni显示出近5倍的硬度增加和50%的磨损体积损失减少。高腐蚀速率的纳米晶铁动力学青睐，由于高晶界区域和缺乏钝化膜的形成。纳米晶Fe与Ni（约2.6wt.%）的合金沉积已证明其有益于提高耐腐蚀性而不显著损害其耐磨性。
Interstitial free (IF) steel exhibits high formability but relatively lower strength and poor wear resistance, whereas nanocrystalline materials provide excellent mechanical properties due to their high grain boundary area. The present study is aimed at amalgamation of nanocrystalline materials to IF steels in the form of hard coatings to assess the wear and corrosion resistance. Nanocrystalline Fe and Fe-Ni alloy, with grain size of ∼25 nm, produced by pulsed electrodeposition were used to investigate micro-wear and electrochemical behaviour. As compared to IF steel, nanocrystalline Fe and Fe-Ni showed nearly five-fold increase in hardness and 50% reduction in wear volume loss. Higher corrosion rates of nanocrystalline Fe are kinetically favoured due to high grain boundary region and lack of passive film formation. Alloy deposition of nanocrystalline Fe with Ni (∼2.6 wt.%) has proved to be beneficial for improving corrosion resistance without substantial compromise in its wear resistance.