用 X 射线衍射技术研究了30CrMnSiNi2A 高强度钢上镉及镉-钛镀层中的晶体取向。镀层中晶体取向具有轴向织构的特征。氰化镀镉中为<11■2>取向;无氰镀镉中为<11■2>+<10■0>取向;无氰镀镉-钛(0.3～0.6%)形成<11■0>+<10■0>取向的轴向织构,再添加少量麦芽糖(光亮剂)可提高其轴向织构的程度。少量钛在镀层中起着控制晶体取向转变及吸氢的作用,减少了基材氢脆的危险性。
The crystallographic orientations of Cd and Cd-Ti electrodeposited layer on the high strength steel 30CrMnSiNi2A have been studied by x-ray diffraction technique.The axes of textures of deposited layer have been measured.The results are as follows:〈11■2〉,〈11■2〉+〈10■0〉for the electrodeposited Cd in the cyanide and non-cyanide bath,respectively.〈11■0〉+〈10(?)0〉for the electrodeposited Cd-Ti(0,3～0.6%)in the non-cyanide bath.Due to a little maltose(brightener)added in the non-cyanide bath of eleetrodeposite Cd-Ti, the tendency of preferred orientation has increased.A little titanium in the deposited layer plays an important role in the change of orientation and hydrogen absorption.Therefore,the trend of hydrogen embrittlement of the steel is reduced.
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