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Corrosion of Ti coating prepared by modified HVOF process

机译：改进的HVOF工艺制备的Ti涂层的腐蚀

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Titanium exhibits very good corrosion resistance property because of the formation of very dense oxide coating. Expecially the good corrosion against Cl-solution for titanium material makes it wide applications in sea industry. It is very difficult to deposite Titanium coating under atmospheric condition due to the strong affinity with oxygen and nitrogen especially in high temperature plume. Except the expensive LPPS process, much attention has been paid to the newly developed cold spraying. Unfortunately the stringent requirement for the starting power and low production efficiency limit the application of the cold spraying. A modified HVOF process was developed by reducing the outlet diameter of chamber and by directly introducing water into chamber, therefore lower plume temperature and higher chamber pressure than conventional HVOF process can be achieved. Attempts to deposite Titanium coating were carried out, and immersion of Titanium coated A3 steel into artificial seawater was performed in order to evaluate the density of as-sprayed Titanium coating. The results showed that dense Titanium coating could be obtained after parameter optimization and very few corrosion spot was observed on the surface of Titanium coated A3 steel after immersion into arficial seawater for 120 h.
机译：钛由于形成非常致密的氧化物涂层而具有非常好的耐腐蚀性。特别是钛材料对Cl溶液的良好腐蚀使其在海洋工业中得到广泛应用。由于与氧气和氮气的强烈亲和力，特别是在高温羽流中，在大气条件下很难沉积钛涂层。除了昂贵的LPPS工艺外，新开发的冷喷涂技术也引起了很多关注。不幸的是，对启动功率的严格要求和低生产效率限制了冷喷涂的应用。通过减小腔室的出口直径并直接将水引入腔室，开发了改进的HVOF工艺，因此，与传统的HVOF工艺相比，可以获得更低的羽流温度和更高的腔室压力。尝试沉积钛涂层，并且将钛涂层的A3钢浸入人造海水中以评估喷涂后的钛涂层的密度。结果表明，参数优化后可获得致密的钛涂层，浸入人造海水120 h后，钛涂层的A3钢表面几乎看不到腐蚀点。

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