基本信息
项目批准号：51705125
申请代码：E0505
项目名称：搅拌摩擦加工镍铝青铜组织演变及其空蚀和腐蚀性能(néng)研究
项目负责人：李阳
依托单位：河北工程大學(xué)
研究期限：2018-01-01 至 2020-12-31
资助经费：25.0（万元）
项目摘要

中文(wén)摘要：
铸态镍铝青铜作為(wèi)一种重要的海洋工程材料，凭借其良好的力學(xué)和腐蚀性能(néng)被广泛应用(yòng)于船用(yòng)螺旋桨等领域，是舰船安全平稳行驶的保障。然而，随着舰船向着遠(yuǎn)洋和深海发展，铸态镍铝青铜自身存在的缺陷造成了严重的空蚀和腐蚀破坏，因此根据其服役环境的特点选择合适的表面改性技术显得尤為(wèi)重要。本项目拟采用(yòng)搅拌摩擦加工技术，对铸态镍铝青铜进行表面改性，并在不同腐蚀介质下（包括蒸馏水和人工海水）进行空蚀试验，结合X射線(xiàn)衍射仪、扫描電(diàn)子显微镜、能(néng)谱仪、透射電(diàn)子显微镜等多(duō)种检测手段，分(fēn)析表面改性层在整个空蚀过程中的表面和截面形貌、晶體(tǐ)结构、元素分(fēn)布等变化。根据表面改性层组织结构和力學(xué)性能(néng)的变化特点及规律，探索改性镍铝青铜的空蚀和腐蚀机制，明确空蚀与腐蚀相互作用(yòng)机理(lǐ)，探索改性层组织结构变化对其空蚀和腐蚀性能(néng)的影响。同时对比分(fēn)析改性层的静态腐蚀性能(néng)和電(diàn)化學(xué)性能(néng)，為(wèi)搅拌摩擦加工技术制备出性能(néng)优良的耐空蚀和腐蚀材料提供理(lǐ)论依据。
英文(wén)摘要：
As-cast nickel aluminum bronze (NAB) have been widely employed in marine propellers due to its excellent mechanical properties and corrosion properties. However, as-cast NAB encounters significant cavitation erosion and corrosion in a more severe marine environment due to its defects. Therefore, it is very important to select the appropriate surface modification technology according to the characteristics of its service environment. To serve this purpose, this study is aiming at the surface modification on NAB by friction stir processing (FSP). The cavitation tests of FSP NAB are carried out in distilled water and artificial sea water and a detailed analysis of the surface and cross-section morphologies, microstructure and element distribution are performed by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The cavitation erosion and corrosion mechanisms and synergistic effect of cavitation erosion and corrosion are investigated accordingly with the variation of microstructure and mechanical properties of FSP NAB through the whole cavitation erosion process and how the variation of FSP NAB microstructure influences the cavitation erosion and corrosion resistance is thoroughly examined. Meanwhile, by comparison of static-state corrosion and electrochemical properties of FSP NAB, this study is destined to corroborate the theoretical foundation for the future application of FSP materials in the field of marine cavitation erosion and corrosion protection.
 
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