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采用SEM和AFM对不同合金化工艺的热镀锌合金化镀层断面结构和表面形貌进行观察和表征,并用摩擦系数仪测定了压力对不同工艺的镀层表面摩擦系数的影响,分析了合金化工艺和载荷对热镀锌合金化钢板(简称GA钢板)镀层表面摩擦特性的影响。结果表明,合金化时间为50 s时镀层表面的摩擦系数最大,此后随着合金化时间的延长镀层表面的摩擦系数基本保持不变;不同工艺的合金化镀层表面的相结构不同,当镀层表面以ζ相为主并伴有少量η相或以块状ζ相及致密的栅柱状δ相晶体为主时,镀层表面较平滑,表面没有出现明显的“火山口”状形貌时镀层表面的摩擦系数最小;随压应力的增加,镀层表面摩擦系数逐步增大,但是在较大压应力作用下,镀层表面摩擦系数的增幅明显降低。
SEM and AFM were used to observe and characterize the cross-sectional structure and surface morphology of hot-dip galvanized alloying coatings with different alloying processes. The influence of pressure on the surface friction coefficient of different coatings was measured by friction coefficient meter. And load on the hot-dip galvanized alloy steel (GA steel plate) coating surface friction characteristics. The results show that the friction coefficient of the coating surface is the maximum when the alloying time is 50 s, and the friction coefficient of the coating surface remains the same with the alloying time prolonging. The phase structure of the alloy coating surface is different, When the ζ phase is dominated with a small amount of η phase or the bulk ζ phase and the dense columnar δ-phase crystal, the coating surface is smooth and no obvious “crater” morphology coating appears on the surface The friction coefficient of the surface is the smallest; with the increase of compressive stress, the friction coefficient of the coating surface increases gradually, but under the action of the larger compressive stress, the increase of the friction coefficient of the coating surface obviously decreases.