表没食子儿茶素没食子酸酯对镍铬合金电化学腐蚀后表面结构和性能的影响

发布时间：2019-03-30 12:13

【摘要】：目的:研究表没食子儿茶素没食子酸酯(epigallocatechin gallate,EGCG)对镍铬合金电化学腐蚀后表面结构和性能的影响。方法:采用体视显微镜和扫描电镜,观察经0 g/L和1.0 g/L EGCG人工唾液电化学腐蚀后镍铬合金的表面形貌,并运用光电子能谱仪分析经0 g/L和1.0 g/L EGCG人工唾液电化学腐蚀后镍铬合金的表面腐蚀产物。结果:经0 g/L和1.0 g/L EGCG人工唾液电化学腐蚀后,镍铬合金表面均有不同程度的腐蚀,在0 g/L EGCG人工唾液中,出现的点蚀坑直径较小,基本未影响合金表面的枝晶结构;而在1.0 g/L EGCG人工唾液中,镍铬合金表面发生了较为严重的腐蚀,点蚀坑直径较大,枝晶区间开始融合、变得模糊不清。此外,经0 g/L EGCG和1.0 g/L EGCG人工唾液电化学腐蚀后,镍铬合金表面溅射120 s后均检测到了O、Ni、Cr、Be、C及Mo元素,表面氧化物均主要为NiO和Cr2O3。与0 g/L EGCG人工唾液相比,镍铬合金在1.0 g/L EGCG人工唾液电化学腐蚀后表面O元素、NiO和Cr2O3的含量较低。结论:经EGCG人工唾液电化学腐蚀后,镍铬合金表面形貌和表面腐蚀产物结果一致,提示1.0 g/L EGCG促使镍铬合金表面耐腐蚀性能变差,表面腐蚀产物中氧化物含量也降低。
[Abstract]:Aim: to study the effect of epigallocatechin gallate (epigallocatechin gallate,EGCG) on the surface structure and properties of Ni-Cr alloy after electrochemical corrosion. Methods: the surface morphology of Ni-Cr alloy after electrochemical corrosion in 0 g / L and 1.0 g / L EGCG artificial saliva was observed by stereoscopic microscope and scanning electron microscope. The surface corrosion products of Ni-Cr alloy after electrochemical corrosion in 0 g / L and 1.0 g / L EGCG artificial saliva were analyzed by photoelectron spectroscopy (XPS). Results: after electrochemical corrosion of 0 g / L and 1.0 g / L EGCG artificial saliva, Ni-Cr alloy surface was corroded in varying degrees. In 0 g / L EGCG artificial saliva, the pitting pit diameter was smaller. There is little effect on the dendrite structure on the alloy surface. However, in 1.0 g / L EGCG artificial saliva, the surface of Ni-Cr alloy was corroded seriously, the pitting pit diameter was larger, the dendrite region began to fuse and became blurred. In addition, after electrochemical corrosion of 0 g / L EGCG and 1.0 g / L EGCG artificial saliva, O, Ni, Cr, be, C and Mo elements were detected on the surface of Ni-Cr alloy after 120s sputtering. The surface oxides were mainly NiO and Cr2O3.. Compared with 0 g / L EGCG artificial saliva, the contents of O, NiO and Cr2O3 on the surface of Ni-Cr alloy after electrochemical corrosion of 1.0 g / L EGCG artificial saliva were lower. Conclusion: after electrochemical corrosion of EGCG artificial saliva, the surface morphology and corrosion products of Ni-Cr alloy are consistent. It is suggested that 1.0 g / L EGCG can cause the corrosion resistance of Ni-Cr alloy to become worse and the content of oxide in the corrosion product of Ni-Cr alloy decrease.
【作者单位】：上海市口腔病防治院修复科;山东省济南市口腔医院儿童口腔科;同济大学口腔医学院修复科;
【基金】：上海市卫生局青年课题(20114Y053) 上海市自然科学基金(12ZR1427200) 上海市卫生局课题(20124172)~~
【分类号】：R783.1

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