轻金属热喷涂预处理氧化物的去除机理与界面行为

热喷涂是便捷、经济、适应范围广的表面工程技术之一，轻质活泼金属表面腐蚀和磨损热喷涂防护涂层的应用，对轻质防腐、耐磨结构件的设计意义重大。本项目以Al、Mg、Ti轻金属合金表面制备马氏体钢质耐磨涂层为例，系统研究涂层预处理界面氧化物的去除甚至有益化利用处理若干基础科学问题，包括：研究喷涂基材预处理氧化物（例如Al2O3、MgO、TiO2等）膜的生成机理和存在特点，建立喷涂熔融颗粒与基材、氧化物膜接触传热模型，计算选择对氧化物有熔融效果的过渡粘结层金属和喷涂颗粒尺寸，探究过渡粘结层内氧化物熔融状态、存在特性、金属间化合物的形成与涂层堆叠沉积结构、性能之间的关系等。项目将建立起一个系统地开展工作的方法，从根本上改变目前轻质活泼金属合金表面热喷涂预处理氧化物仅能部分机械去除的简单研究思路，推动整个轻质活泼金属合金热喷涂钢质（或合金）耐磨蚀涂层的高强界面结合领域的理论基础发展。

The thermal spray technology offers a variety of techniques, which allow the deposition of a wide range of functional coatings with the characters of convenient, economical and flexible process. The application of thermal spray on lightweight active metal surface for corrosion and wear coating is of great significance to the design of anti-corrosion and anti-wear lightweight structures. This propose takes the preparation of martensitic steel wear resistant coating on the surface of Al, Mg and Ti lightweight metal alloys as examples, and systematically studies some basic scientific problems on the removal and even beneficial utilization of surface pretreatment oxide (SPO) at the coating interface. . By studying the formation mechanism and existing characteristics of SPOs (e.g. Al2O3, MgO, TiO2, etc.) films on the special aluminum, magnesium and titanium alloy substrates, establishing heat transfer model for the contact between spray molten droplet and substrate and SPO also, determines the metal element and the spray particle size of the transition bond layer (TBL) which could melt the SPOs. Thus, relationships between the melting state of SPOs, SPOs genetic characteristics in the TBLs, intermetallic formation, splats bonding mechanisms, coating structure and performance, etc. will be explored. . A systematic work method will be set up by the investigation, fundamentally changes the simple research idea that the drawbacks of SPOs on lightweight metal alloy surface could be partly mechanically removed and is not preferable in thermal spray process, and promotes the theoretical development of the high interface bonding performance between the steel wear/corrosion-resistant coatings and the lightweight active metal alloy substrates by thermal spray technology.