Wear and Corrosion Behavior of HVOF-Sprayed WC-CoCr Coatings on Al Alloys
Wear and Corrosion Behavior of HVOF-Sprayed WC-CoCr Coatings on Al Alloys
复制标题
铝合金上 HVOF 喷涂 WC-CoCr 涂层的磨损和腐蚀行为
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
L. Lusvarghi
中科院分区：
文献类型：
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作者：
M. Barletta;G. Bolelli;B. Bonferroni;L. Lusvarghi
将WC-CoCr涂层HVOF喷涂到AA 6082 T6基材上。通过逐步增加焊炬扫描次数，可获得50 - 150 μm的厚度值。这种增加使得涂层不仅更厚，而且更致密。这是由于两个喷丸效果和修改的飞溅形成机制，研究了聚焦离子束技术。由于这种致密化，层的硬度、耐磨性和抗冲击性以及腐蚀保护性随着焊炬扫描的次数而增加。最大的改善发生在2到3次火炬扫描。这些涂层也与阳极氧化膜进行了比较：金属陶瓷具有上级耐磨性和抗冲击性，但提供的腐蚀保护较少。
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.