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研究了H_2O_2/HCl混合溶液中不同腐蚀时间对DD6单晶高温合金表面粗糙度及表面形貌的影响,使用表面粗糙度轮廓仪分析腐蚀前后合金的表面粗糙度,利用3D激光共聚焦扫描显微镜观察腐蚀前后合金的表面形貌,采用电子分析天平测定合金在不同腐蚀时间内的腐蚀速率,并探讨DD6合金在H_2O_2/HCl混合溶液中的耐腐蚀机制。结果表明:随着腐蚀时间的增大,DD6合金表面粗糙度呈现逐步增长规律;腐蚀后合金表面枝晶间区域出现腐蚀坑,随着腐蚀坑的扩大逐渐形成了腐蚀沟槽,枝晶干区域呈现凸出形貌;随着腐蚀时间的增大,合金的腐蚀速率先增大后降低;DD6合金的枝晶干与枝晶间的电势差异对腐蚀后合金的表面形态及腐蚀机制起到了决定作用。
The effect of different etching time on the surface roughness and surface morphology of DD6 single crystal superalloy was studied in H 2 O 2 / HCl mixed solution. The surface roughness of the alloy before and after corrosion was analyzed by surface roughness profiler. The surface morphology of the alloy was observed by 3D laser scanning confocal microscope The surface morphology of the alloy before and after the corrosion was measured by using an electronic analytical balance to determine the corrosion rate of the alloy during different corrosion times and the corrosion resistance mechanism of the DD6 alloy in the H 2 O 2 / HCl mixed solution. The results show that with the increase of corrosion time, the surface roughness of DD6 alloy shows a gradual growth pattern. The corrosion pits appear in the interdendrites of the alloy surface after corrosion, and the corrosion trenches gradually formed as the corrosion pits expand. With the increase of corrosion time, the corrosion rate of the alloy first increases and then decreases. The potential difference between the dendrites and dendrites of DD6 alloy determines the surface morphology and corrosion mechanism of the alloy after corrosion effect.