论文部分内容阅读
在渗铝涂层中加入少量硅可进一步提高涂层的抗高温氧化和热腐蚀性能。本文作者采用一种新的方法—高温熔盐电解法,在熔融氯化物盐浴中进行电解共渗铝硅,在铁和铁—铬合金上获得了渗铝硅涂层。用氯化物作为电解质主要优点是无毒和价廉。高温熔盐电解渗铝硅可获得表面光洁、厚度均匀、与基体结合良好的致密渗层。通过控制电解温度、时间和电流密度可容易地控制渗层厚度,所得到的渗层不需随后热处理。 1000℃氧化试验和900℃热腐蚀(盐膜法)结果表明渗铝硅涂层比单纯渗铝涂层具有更好的保护性能。
Adding a small amount of silicon to the aluminized coating further increases the resistance of the coating to high temperature oxidation and hot corrosion. The authors adopt a new method, high temperature molten salt electrolysis, electrolytically aluminosilicate in a molten salt bath and aluminized silicon coatings on iron and iron-chromium alloys. The main advantage of using chloride as an electrolyte is non-toxic and inexpensive. High-temperature molten salt electrolysis of aluminized silicon can get a smooth surface, uniform thickness, combined with the matrix of a good tight layer. The thickness of the layer can be easily controlled by controlling the temperature, time and current density of the electrolysis, and the resulting layer does not need to be subsequently heat-treated. The results of 1000 ℃ oxidation test and 900 ℃ hot corrosion (salt film method) show that the aluminized silicon coating has better protective performance than the pure aluminized coating.