雒晓涛,魏瑛康,张越,李长久.原位微锻造冷喷涂制备高致密铝基涂层及耐腐蚀性能[J].表面技术,2019,48(4):34-39.
LUO Xiao-tao,WEI Ying-kang,ZHANG Yue,LI Chang-jiu.Fully Dense Al Coatings Sprayed by In-situ Micro-forging Assisted Cold Spray and Corrosion Protection[J].Surface Technology,2019,48(4):34-39 |
| 原位微锻造冷喷涂制备高致密铝基涂层及耐腐蚀性能 |
| Fully Dense Al Coatings Sprayed by In-situ Micro-forging Assisted Cold Spray and Corrosion Protection |
| 投稿时间：2019-01-23 修订日期：2019-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.005 |
| 中文关键词: 冷喷涂 原位微锻造 镁合金 铝涂层 显微组织 耐腐蚀性能 |
| 英文关键词:cold spray in-situ micro-forging magnesium alloys Al coating microstructure anticorrosion performance |
| 基金项目:国家自然科学基金项目（51875443，51401158）；陕西省自然科学基金（2015JQ5200） |
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| Author | Institution |
| LUO Xiao-tao | State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi￠an Jiaotong University, Xi￠an 710049, China |
| WEI Ying-kang | State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi￠an Jiaotong University, Xi￠an 710049, China |
| ZHANG Yue | State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi￠an Jiaotong University, Xi￠an 710049, China |
| LI Chang-jiu | State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi￠an Jiaotong University, Xi￠an 710049, China |
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| 中文摘要: |
| 目的 提出一种基于原位微锻造冷喷涂制备高致密度金属沉积体的新方法，旨在为镁合金腐蚀防护提供一种低成本的涂层制备方法。方法 通过在Al喷涂粉末中混入20%~60%（体积分数）的大粒径喷丸颗粒，借助其在喷涂过程中对已沉积Al涂层的原位微锻造效应，实现Al涂层制备中的实时致密化，研究了原位微锻造强度对涂层显微组织及耐腐蚀性能的影响规律。采用SEM分析了涂层的显微结构，采用电化学测试及长期浸泡试验测试了涂层的耐腐蚀性能。结果 随着微锻造强度的提高，金属沉积体的致密度逐渐增加，当混合粉末中的喷丸颗粒含量高于40%时，可获得孔隙率低于0.3%的高致密度Al涂层。电化学测试及长达1000 h的NaCl溶液浸泡腐蚀结果显示，高致密度Al涂层包覆后的镁合金表现出与冶金块材铝相当的耐腐蚀性能，比无保护镁合金腐蚀速率降低两个数量级以上；在1000 h的盐雾腐蚀后，涂层与基材界面无腐蚀产物生成，表明涂层可完全对腐蚀介质进行物理隔绝。同时，致密铝涂层表面形成了微米级的钝化膜，可进一步提高耐腐蚀性能。结论 通过原位微锻造辅助冷喷涂技术，可在较低的气体温度和气体压力条件下在镁合金表面获得完全致密的Al腐蚀防护涂层。该技术还有望用于诸如高导热、高导电涂层的制备，金属构件修复及增材制造等其他对金属沉积体有致密度要求的领域。 |
| 英文摘要: |
| The work aims to propose a new method of preparing fully dense metal deposit based on in-situ micro-forging assisted cold spray, so as to provide a low-cost preparation method for corrosion protection of magnesium alloy. Big sized shot-peening (SP) particles of 20vol.%~60 vol.% were mechanically mixed into aluminum powders as the spraying powder. During spraying, the deposited aluminum coating layer could be in-situ forged and densified by the big sized SP particles. Effect of in-situ forging strength on microstructure and corrosion resistance of Al coating was investigated. SEM was adopted to analyze the microstructure of the coating and electrochemical tests and long-term immersion tests were carried out to evaluate the corrosion resistance of the coating. As the SP strength improved, the density of metallic deposit gradually increased. When the SP particle content was higher than 40%, fully dense adherent Al coatings with porosity lower than 0.3% could be achieved by MF-CS technique. Electrochemical tests and 1000 h immersion test in NaCl solution showed that the magnesium alloy covered with fully dense Al coating presented the same corrosion resistance as the bulk Al and the corrosion rate decreased by over two orders when compared with that of unprotected magnesium alloy. After 1000 h salt spray, the interface between coating and substrate had no corrosion products, which showed that the coating could fully isolate the corrosion medium. Meanwhile, the micron level passivation film occurred on the fully dense coating and improved the corrosion resistance further. Through in-situ micro-forging assisted cold spray, fully dense Al corrosion protection coating can be obtained on the magnesium alloy at lower temperature and pressure. The technique is also expected to be used in other fields with density requirements for metallic deposits, such as preparation of high thermal conductivity and high electrical conductivity coatings, repair of metal components and manufacturing of added materials. |
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