This study shows that WC-12Co coatings with low porosity and high wear and corrosion resistance can be applied by high velocity oxygen-fuel (HVOF) on a low melting and highly flammable ZE41 magnesium alloy. This provides a novel and promising use of the high-energy thermal spraying technique on low temperature melting substrates. The spraying distance used was 300 mm, which is between two and three times the recommended distanced for HVOF coating with WC-12Co on steels. Despite this, the WC-12Co coatings obtained were homogeneous, crack-free, and dense. The coatings were very well adhered to the substrates and the spraying distance allowed avoiding any thermal affectation of the substrate. The thickness of the coatings was limited to 45 μm to avoid a big mass increase in the samples. The effect of the number of layers, the O₂/H₂ ratio and the gas transport flow in the coating was studied. The coatings reduced the wear rate of the substrate by 104 times, making them wear resistant. Electrochemical corrosion tests were conducted to study the corrosion protection of the coatings, showing that it is possible to protect the magnesium substrate for 96 h in contact with 3.5 wt.% NaCl aqueous solution.

中文翻译：

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ZE41镁合金上HVOF喷涂WC-12Co的制备，耐磨性和耐蚀性

这项研究表明，低孔隙率，高耐磨性和耐腐蚀性的WC-12Co涂层可通过高速氧气燃料（HVOF）应用于低熔点和高度易燃的ZE41镁合金上。这为高能热喷涂技术在低温熔化的基材上提供了一种新颖而有希望的用途。所用的喷涂距离为300毫米，是在钢上用WC-12Co进行HVOF涂层的推荐距离的2至3倍。尽管如此，所获得的WC-12Co涂层还是均匀，无裂纹且致密的。涂层很好地粘附在基材上，并且喷涂距离允许避免基材的任何热影响。涂层的厚度限制为45μm，以避免样品的大量增加。层数的影响，O_研究了2 / H ₂比和涂层中的气体传输流。涂层将基材的磨损率降低了104倍，使其具有耐磨性。进行电化学腐蚀测试以研究涂层的腐蚀防护，表明与3.5 wt。％的NaCl水溶液接触可以保护镁基材96小时。