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随着社会主义建设事业的发展,各种表面保护工艺应用日益广泛,如化学热处理、喷镀、电镀、氧化、钝化等等方面。其中一个重要趋势为机器零件的表面合金化——化学热处理,在机械、航空、化工及国防工业方面的推广应用和迅速发展,对零件的抗磨性、抗腐蚀性、抗氧化性能等指标部有很大提高。表面保护工艺的广泛应用和发展,对零件表层结构的金相研究也提出了更多更高的要求。由于在金相试样制备过程中,边缘(表面层)部分极易产生倒角、卷边、崩刃等现象;在腐蚀过程中,表层和基体有较
With the development of socialist construction, a variety of surface protection technology is widely used, such as chemical heat treatment, thermal spraying, electroplating, oxidation, passivation and so on. One of the major trends is the surface alloying of machine parts - chemical heat treatment, the promotion and application of the mechanical, aerospace, chemical and defense industries and the rapid development of parts such as abrasion resistance, corrosion resistance, oxidation resistance and other indicators Great improvement. Surface protection technology is widely used and development of the surface structure of the metallurgical research also put forward more and higher requirements. As the metallographic sample preparation process, the edge (surface layer) can easily lead to chamfering, curling, chipping and other phenomena; in the erosion process, the surface layer and the matrix are more