材料期刊网

<正> 近来离子注入已被广泛地用于改善金属与合金表面层的性能。本试验采用离子注入技术将三种剂量(1,3,5×10~(17)Cr/Cm~2)的铬离子,在150kev,注入到电沉积非晶态 Ni-P 合金中。真空室中残余气体中的 C 通过吸咐-扩散进入注入层,从而形成表面非晶态 Ni-Cr-P-C 合金。采用阳极极化研究了该表层非晶态合金在1 M H~2SO_4。及1 M HCl 中的活化-钝化行为与耐点蚀的能力。

Electrodeposited Ni-P amorphous alloy was implanted with chromiu at 150 keV in dosage of(1,3,5)×10~(17)ions·cm~(=2). During implantation of Cr~+ ion,carbon from the residual gases in the vacuum chamber could reach the implanting layer assisted by absorption- diffusion and formed Ni-Cr-P-C layer on the surface of Ni-P. The distribution of Ni,Cr,P and C in the implanted layer was examined by means of SIMS.TEM observation proved that the surface Ni-Cr-P-C was amorphous. The modification of the corrosion properties of the amorphous surface alloys was studied by dynamic polarization in 1M H_2SO_4 and 1M HCl. The experimental results showed that Cr-implantation not only had beneficial effect on the active-passive behavior of electrodeposited Ni-P in 1M H_2SO_4,but also increased,the pitting resistance of the Ni-P in the 1M HCl solution.