Nickel–boron electrochemical properties investigations
Nickel–boron electrochemical properties investigations
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DOI：
10.1016/j.jallcom.2010.05.168
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发表时间：
2010-08
影响因子：
6.2
通讯作者：
A. Kanta;M. Poelman;V. Vitry;F. Delaunois
中科院分区：
文献类型：
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作者：
A. Kanta;M. Poelman;V. Vitry;F. Delaunois
在低碳钢表面合成了化学镀镍-硼(Ni-B)。涂层厚度约为30μm，部分涂层在含95%Ar和5%H_2的气氛中进行400℃×1h的硬化处理，以改善其机械性能。对热处理和未处理的样品进行泰伯磨损试验，以评估其耐磨性。用扫描电子显微镜和粗糙度测量仪对磨痕进行了分析。未处理样品的Taber磨损指数略高于钢，但热处理样品的TW仅为13。用动电位极化和交流阻抗法研究了Ni-B合金镀层的耐蚀性。交流阻抗谱显示在0.1M的氯化钠溶液中有扩散现象。化学镀Ni-B可提高钢的耐蚀性，热处理可进一步提高钢的耐腐蚀性。磨损降低了这种耐磨性，但磨损的产品比未涂层的部件保持了更好的性能。
Electroless nickel–boron (Ni–B) was synthesized on mild steel. Coating thickness was approximately 30μm. Some of the coatings were submitted to a hardening heat treatment at 400°C for 1h in an atmosphere containing 95% Ar and 5% H2to improve their mechanical performance. Heat treated and untreated samples were submitted to the Taber abrasion test to assess their wear resistance. The wear track was then examined by SEM and roughness measurement. The Taber Wear Index of untreated samples was slightly better than that of steel but heat treated samples attained TWI as small as 13. The corrosion resistance of the Ni–B coatings was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The EIS results showed diffusion phenomena in 0.1M NaCl solution. Electroless Ni–B coating increases the corrosion resistance of steel and heat treatments allow a further enhancement. Wear decreases that resistance but the worn product keeps a better behaviour than uncoated parts.