镍镉合金扩散层工艺研究

Techniques and Performance of Ni-Cd Alloy Diffusing Plating

为满足飞机发动机叶轮耐高温腐蚀要求,研究了镍镉合金扩散层的结构,同时分析了镍镉合金镀液工艺参数对扩散层性能的影响。采用合适的电解镍液或化学镀镍液的配方来制取低应力镍层;采用液体喷丸方法提高零件表面强度及抗应力腐蚀能力。结果表明,该两种方法有效克服了镍镉合金扩散层不耐疲劳和高温应力腐蚀的弊病,即使在工作中承受旋转、弯曲、振动、离心等复杂应力作用的镍镉扩散层,也具有优良的性能。

To meet the demand of enduring high - temperature and corrosion for the airplane engine , the structure of Ni - Cd alloy diffusing plating layer was studied, and the effects of technical parameters of plating were analyzed on the Ni-Cd alloy diffusing plating layer. Suitable com- pound Ni electroplating or electroless Ni plating solution were chosen to make low stress Ni layer. Wet spraying pellet was used to improve the surface' s strength and stress corrosion resistance of the workpiece. These two methods overcame the disadvantage of Ni - Cd alloy diffusing plating layer, which could not endure metal fatigue and stress corrosion at high temperatures. The diffusing plating layer possessed good performance even though to under such complicated stress problems as revolving, bending, vibrating, centrifugating.