通过差示扫描量热(DSC)、X射线衍射(XRD)、扫描电镜(SEM)、电化学实验和失重实验研究了热处理对化学沉积Ni-Zn(Fe)-P合金结构、显微硬度、表面形貌和耐蚀性的影响.镀态镀层由非晶相和立方镍相组成(多晶态结构),在384.8℃晶化为四方Ni3P和Ni5Zn12相.镀层显微硬度随热处理温度升高而升高,相反地,500℃后随热处理温度升高而下降.在3.5%(质量分数)NaCl溶液中(pH 7.0)镀态镀层的耐蚀性比经热处理过的镀层好.
The effect of heat treatment on the structure, the microhardness, the surface morphology and the corrosion resistance of electroless Ni-Zn(Fe)-P deposit were studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscope (SEM), electrochemical experiments and mass loss tests. The as-plated deposit consists of an amorphous phase coexisting with a cubic Ni phase (poly-crystalline). The deposit was crystallized into square Ni3 P phase and Ni5 Zn12 phase at 384.8℃. The microhardness of the deposit increases with the increase of heat treatment temperature below 500℃, after it decreases. The as-plated deposit has more corrosion resistance than that of the heat treatment deposit in 3.5wt% NaCl solution(Ph 7.0).
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