材料期刊网

<正> 非晶态Ni-P合金具有优良的耐蚀性能,应用于油田抗H_2S腐蚀已获得良好的效果。H_2S腐蚀本质上是氢致损伤问题。因此,研究氢在电沉积Ni-P非晶态合金中的扩散行为,具有实际意义。对电沉积非晶态Ni-P合金的结构与晶化等已有大量研究,但关于氢在这种合金中扩散的报导较少。

The diffusion of hydrogen in electro-deposited Ni-P amorphous alloys with different phosphorous contents (e. g. 8,10,12,14wt. ％) has been measured using electrochemical technique. The hydrogen diffusivities in the alloys decrease as the phosphorous contents increase. The second round permeation transients show that the hydrogen trapping effects strengthen with the increase of phosphorous contents in Ni-P amorphous alloy. The relation between diffusion co-efficient of hydrogen and temperature is in agreement with the Arrhenius curve. When the phosphorous concentration is 12wt. ％, D=9.16×10~(-2)exp (-49500/RT) cm~2/sec, diffusion activation energy is 49.5kJ/mol. Passive films formed on Ni-P amorphous alloy in 0.1N NaOH solution have some influence on the apparent diffusivity of hydrogen. It is observed that the apparent diffusivities are less affected by polarized potentials in passive region but greatly in overpassive region.