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Wear and Corrosion Behavior of HVOF-Sprayed WC-CoCr Coatings on Al Alloys

机译:铝合金上的HVOF喷涂WC-CoCr涂层的磨损和腐蚀行为

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摘要

WC-CoCr coatings were HVOF-sprayed onto an AA6082T6 substrate. Thickness values between 50 and 150 μm were produced by stepwise increase of the number of torch scans. This increase made the coatings not only thicker but also denser. This was due both to peening effects and by modifications to the splat formation mechanism, investigated by focused ion beam technique. Thanks to such densification, the hardness, the wear and impact resistance, and the corrosion protectiveness of the layers increased with the number of torch scans. The largest improvement occurred from 2 to 3 torch scans. These coatings were also compared to anodized films: cermets had superior wear and impact resistance but offered less corrosion protection.
机译:将WC-CoCr涂层HVOF喷涂到AA6082T6基板上。通过逐步增加割炬扫描的数量,可以产生50至150μm的厚度值。这种增加使得涂层不仅更厚而且更致密。这是由于喷丸效应和对飞溅形成机制的修改所致,这是通过聚焦离子束技术进行了研究。由于这种致密化,层的硬度,耐磨性和抗冲击性以及腐蚀防护性随炬扫描次数的增加而增加。最大的改进发生在2到3次割炬扫描中。这些涂层也与阳极氧化膜进行了比较:金属陶瓷具有优异的耐磨性和抗冲击性,但提供的腐蚀防护较少。

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