用椭圆偏振法研究了镍在硼酸盐缓冲溶液中,于初始钝化处(-0.5V,SCE)、稳定钝化处(0.4V)和钝化/过钝化交界处(0.8V)恒电位阳极极化时所生成的钝化膜。分析了钝化膜的厚度、生长动力学规律、成份和生长机理。结果表明:钝化膜的厚度、成份和生长机理都与外加电位有关;在所研究的电位下,钝化膜都具有双层结构;膜生长都先生成外层膜,随后在其下面再生成一层内层膜;内层膜的生长都服从线性规律,外层膜的生长规律分别为线性规律、抛物线规律和对数规律。
Passive films formed on nickel in boric acld-borax solution at first passive potential(-0.5,vs.SCE),steady passive potential(0.4V,vs. SCE)and passive-transpassive potential(0.8V,vs.SCE)have been stu- died by ellipsometry.The results show that the thickness,kinetics, composition and mechanism of passive films are dependent upon applied potential;at above mentioned potentials,the passive films have a two- layer structure,in which the inner layer of the film grows subsequently from the outer layer of the film inwards;the growth of all inner layers follows a linear dependence on time whilst the kinetics of outer layers at-0.5,0.4 and 0,8 V is linear,parabolic and logarithmic respectively. At constant potential-0.5V,the thickness and composition of inner and outer layers are 223 ,β-Ni(OH)_2and 69,NiO·xH_2O;at 0.4 V,88 ,α-Ni(OH)_2and 33 ,NiO·xH_2O;and at 0,8V,254 ,γ_2-NiOOH and 304 ,β-NiOOH,respectively.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] | |
| [13] | |
| [14] | |
| [15] | |
| [16] | |
| [17] | |
| [18] | |
| [19] | |
| [20] | |
| [21] | |
| [22] | |
| [23] | |
| [24] | |
| [25] | |
| [26] | |
| [27] | |
| [28] | |
| [29] |
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