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首页> 外文期刊>Optics and Lasers in Engineering >Laser surface alloying of an electroless Ni-P coating with Al-356 substrate
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Laser surface alloying of an electroless Ni-P coating with Al-356 substrate

机译：Al-356基体化学镀Ni-P涂层的激光表面合金化

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摘要

Laser surface alloying of an electroless plating Ni-P coatings on an Al-356 aluminium alloy was carried out using a 1-kW pulsed Nd:YAG laser. The microstructure, chemical composition and phase identification of the alloyed layer were determined using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD), respectively. It was shown that laser surface treatment produced a relatively smooth, crack-free and hard surface layer. The hardness of the surface significantly increased due to the formation of the uniformly distributed fine Ni-Al intermetallic phases. The corrosion behaviour of the surface alloyed specimens in 3.5% NaCl solution at 23 ℃ was also determined by electrochemical techniques. The laser-alloyed surface showed an improved corrosion and pitting potential compared to the substrate as well as the plated Ni-P coating.
机译：使用1-kW脉冲Nd：YAG激光在Al-356铝合金上进行化学镀Ni-P涂层的激光表面合金化。分别使用扫描电子显微镜（SEM），能量色散X射线光谱仪（EDX）和X射线衍射仪（XRD）确定合金层的微观结构，化学成分和相识别。结果表明，激光表面处理产生了相对光滑，无裂纹和坚硬的表面层。由于形成均匀分布的细Ni-Al金属间相，表面的硬度显着提高。还通过电化学技术测定了表面合金化试样在3.5％NaCl溶液中在23℃下的腐蚀行为。与基材以及镀Ni-P涂层相比，激光合金表面的腐蚀和点蚀潜力得到改善。

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