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渗铝可以显著延缓GH36钢晶界腐蚀的产生,渗铝工艺已用于WP-6发动机一级涡轮盘,解决了涡轮盘槽底裂纹的问题,在生产使用中已取得显著效果。近期的工作证明,预氧化可以显著提高GH36钢渗铝层的抗蚀性能,因而是延长渗铝GH36钢零件寿命的极简单而有效的方法。预氧化即零件在渗铝之后,在一定条件下生成一层完整、致密的氧化物薄膜,这层薄膜较之“自然”生成的薄膜有更好的保护作用,因此可以显著提高渗铝层的抗蚀能力。对经预氧化的渗铝GH36钢试样,分别进行了抗蚀性能和机械性能的试验。在常温腐蚀条件下,无论从出现腐蚀的时间看,还是从周浸85昼夜后渗铝层的剩余厚度看,提高抗蚀性能都在一倍以上。在高温腐蚀条件下,从650℃
Aluminizing can significantly delay the grain boundary corrosion of GH36 steel. The aluminizing process has been applied to the first stage turbine disk of WP-6 engine, which solves the problem of crack at the bottom of the turbine disk and has achieved remarkable results in production and use. Recent work has demonstrated that pre-oxidation can significantly improve the corrosion resistance of the aluminized layer of GH36 steel and therefore is a very simple and effective way to extend the life of aluminized GH36 steel parts. Pre-oxidation means that the part, after aluminizing, produces a complete, dense oxide film under certain conditions that provides a better protection than the “naturally” formed film, thereby significantly increasing the thickness of the aluminized layer Anti-corrosion ability. The pre-oxidized aluminized GH36 steel samples were tested for corrosion resistance and mechanical properties respectively. Corrosion conditions at room temperature, both from the time of corrosion appears, or from the dipping 85 days and nights after the remaining thickness of the aluminized layer to improve the corrosion resistance are more than doubled. Under high temperature corrosion conditions, from 650 ℃