In this paper,large deviations principle(LDP)and moderate deviations principle(MDP)of record numbers in random walks are studied under certain conditions.The results show that the rate functions of LDP and MDP are dif...In this paper,large deviations principle(LDP)and moderate deviations principle(MDP)of record numbers in random walks are studied under certain conditions.The results show that the rate functions of LDP and MDP are different from those of weak record numbers,which are interesting complements of the conclusions by Li and Yao[1].展开更多
为了提高Zn Fe合金镀层及Zn Fe TiO2复合镀层的耐蚀性,采用非银盐发黑剂,结合磷化工艺,并加入适当的添加剂及辅助成膜剂,系统研究了含铁0.2%～0.8%的Zn Fe合金镀层黑色钝化工艺,得到了最佳的镀液组成及工艺条件。采用这种钝化工艺获... 为了提高Zn Fe合金镀层及Zn Fe TiO2复合镀层的耐蚀性,采用非银盐发黑剂,结合磷化工艺,并加入适当的添加剂及辅助成膜剂,系统研究了含铁0.2%～0.8%的Zn Fe合金镀层黑色钝化工艺,得到了最佳的镀液组成及工艺条件。采用这种钝化工艺获得的钝化膜油黑发亮,色调均匀,耐蚀性高,附着力强,耐磨性好。在最佳镀液组成及工艺条件下,对Zn镀层、Zn Fe合金镀层及Zn Fe TiO2复合镀层黑色钝化膜的耐蚀性进行了研究。5%NaCl中性溶液浸泡实验表明,经黑色钝化后,Zn Fe合金镀层及Zn Fe TiO2复合镀层的耐蚀性有了很大的提高。Zn Fe合金镀层的耐蚀性是纯Zn镀层的3倍多;Zn Fe TiO2复合镀层的耐蚀性是Zn Fe合金镀层的2倍左右,是纯Zn镀层的5倍左右,是一种理想的代镉镀层。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11671145)the Science and Technology Commission of Shanghai Municipality(Grant No.18dz2271000).
文摘In this paper,large deviations principle(LDP)and moderate deviations principle(MDP)of record numbers in random walks are studied under certain conditions.The results show that the rate functions of LDP and MDP are different from those of weak record numbers,which are interesting complements of the conclusions by Li and Yao[1].
文摘 为了提高Zn Fe合金镀层及Zn Fe TiO2复合镀层的耐蚀性,采用非银盐发黑剂,结合磷化工艺,并加入适当的添加剂及辅助成膜剂,系统研究了含铁0.2%～0.8%的Zn Fe合金镀层黑色钝化工艺,得到了最佳的镀液组成及工艺条件。采用这种钝化工艺获得的钝化膜油黑发亮,色调均匀,耐蚀性高,附着力强,耐磨性好。在最佳镀液组成及工艺条件下,对Zn镀层、Zn Fe合金镀层及Zn Fe TiO2复合镀层黑色钝化膜的耐蚀性进行了研究。5%NaCl中性溶液浸泡实验表明,经黑色钝化后,Zn Fe合金镀层及Zn Fe TiO2复合镀层的耐蚀性有了很大的提高。Zn Fe合金镀层的耐蚀性是纯Zn镀层的3倍多;Zn Fe TiO2复合镀层的耐蚀性是Zn Fe合金镀层的2倍左右,是纯Zn镀层的5倍左右,是一种理想的代镉镀层。
