不锈钢表面振动冲击加速渗铝工艺研究

研究了利用喷丸加速制备涂层技术,对1Cr18Ni9Ti不锈钢分别进行600℃×4、6和8 h渗铝处理,研究了1Cr18Ni9Ti试样的单位面积增重、Al涂层厚度、主要元素沿涂层截面的分布;并将不同温度下获得的铝化物涂层与空白试样一起进行了高温氧化测试实验(900℃×100 h)。结果表明,在较低的温度600℃和较短的时间4 h,可以在1Cr18Ni9Ti钢基体上形成35μm厚的铝化物涂层;但抗氧化性能测试结果却表明,振动渗制处理6 h获得的铝化物涂层性能优于处理4 h和8 h的涂层。

Study on low-temperature aluminizing on a stainless steel assisted by ball milling

In order to accelerate the formation process of aluminide coating on 1Cr18Ni9Ti stainless steel substrate at relatively low temperature,mechanical vibration and impact were applied to 1Cr18Ni9Ti sample during aluminizing by a similar ball peening process.The coating was obtained by aluminizing at 600 ℃ for 4 h,6 h and 8 h,and the aluminizing coating weight gain,coating thickness,alloying element distribution across aluminizing coating were investigated.High temperature oxidation kinetics of coatings and bare sample were measured at 900 ℃ for 100 h.The results show that a dence layer of aluminizing coating can formed on 1Cr18Ni9Ti steel substrate and the coating thickness can reach 35 μm after vibration aluminization at 600 ℃ for 4 h.Oxidation resistance performance measurement reveals that the optimal duration time is 6 h because the weight gain for 6 h is less than 4 h and 8 h.