X 射线衍射研究电铸模具镍镀层

Studies on the Texture and Internal Stress σ_I of Nickel Electrodeposits on Electroformed Mould by means of X-Ray Diffraction

本文在普用测角台上按反射法扫测了电铸模具镍镀层的多晶衍射全谱,据之计算出镀层各晶面的择优系数 T_c 与第一类应力σ_1.并研究了在氨基磺酸盐电铸液中,改变电流密度,温度及 pH 值对镀层的织构和应力σ_1的影响。研究结果表明,在该电铸液里电流密度为3A/dm^2,温度为50℃,pH 值等于4时,形成强且稳定的{200}有利面织构,兼之有较小的σ_1,确定为电铸模具的合理电镀工艺。

The whole diffraction spectrum of multicrystal of nickel electrodeposits on electrofo- ormed mould has been scanned on the measuring angle desk,and the preferred coefficient Tc of each crystalline facet and the first kind internal stress σ_Ⅰ have been calculated.The effe- cts of current density,temperature and the pH value,applied in sulfamate bath,on the texture and internal stress σ_Ⅰ have also been investigated.The results show that fairly stable {200} facet texture can be formed in the conditions of which the current density is 3 A/dm,the temperature at 50℃ and the pH value 4 in the bath;besides,the σ_Ⅰ is rather small.It can be applied as a reasonable electroforming technique