The use of NiBrAl casting alloy for the construction of marine propellers is expanding due to the resistance to fatigue, corrosion and wear under the effect of particles suspended in fluid. In this study, the nanostructure of the Ni-B coating is created by the electroless plating method on the NiBrAl alloy surface. After plating, the specimens are heat-treated, and the temperature and optimum time of the heat treatment are found to be 410°C and 70 min. The microstructural study by scanning electron microscopy and X-ray diffraction shows that, by conducting the heat treatment after plating, the amorphous structure of the coating becomes crystalline. After heat treatment cauliflower colonies experience 17% growth due to their constituent crystallites. After plating and heat treatment, the hardness of the surface increased from 410 to 788 and 1365 Vickers, respectively. According to the pin-on-disk wear test results, the wear resistance improves due to plating and heat treatment. The microscopic study of the worn surfaces shows that the heat treatment turns the wear mechanism from adhesive to slightly abrasive. The corrosion resistance evaluation by the polarization test shows that heat treatment leads to the reduction of corrosion resistance. According to the results, the electroless Ni-B coatings can be considered as one of the best options to improve the properties and performance of NiBrAl alloys, under service conditions.

中文翻译：

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通过化学镀 Ni-B 改善 NiBrAl 铸造合金表面性能，用于动态海洋应用

由于在悬浮在流体中的颗粒的作用下，NiBrAl铸造合金具有抗疲劳、腐蚀和磨损的能力，因此用于建造船用螺旋桨的NiBrAl铸造合金正在扩大。在这项研究中，Ni-B 涂层的纳米结构是通过化学镀方法在 NiBrAl 合金表面形成的。电镀后，对试样进行热处理，发现热处理的温度和最佳时间为 410℃和 70 分钟。通过扫描电子显微镜和 X 射线衍射的显微组织研究表明，通过在电镀后进行热处理，镀层的非晶结构变为结晶。热处理后的花椰菜菌落由于其组成微晶而经历了 17% 的增长。电镀和热处理后，表面硬度分别从 410 增加到 788 和 1365 维氏。根据销盘磨损试验结果，由于电镀和热处理，耐磨性提高。磨损表面的微观研究表明，热处理将磨损机制从粘性转变为轻微磨损。极化试验的耐蚀性评价表明热处理导致耐蚀性降低。根据结果​​，化学镀 Ni-B 涂层可以被认为是在使用条件下改善 NiBrAl 合金性能和性能的最佳选择之一。磨损表面的微观研究表明，热处理将磨损机制从粘性转变为轻微磨损。极化试验的耐蚀性评价表明热处理导致耐蚀性降低。根据结果​​，化学镀 Ni-B 涂层可以被认为是在使用条件下改善 NiBrAl 合金性能和性能的最佳选择之一。磨损表面的微观研究表明，热处理将磨损机制从粘性转变为轻微磨损。极化试验的耐蚀性评价表明热处理导致耐蚀性降低。根据结果​​，化学镀 Ni-B 涂层可以被认为是在使用条件下改善 NiBrAl 合金性能和性能的最佳选择之一。