采用电沉积的方法,以亚磷酸为磷源制备出了含钨量较高及不同磷含量(其原子分数分别为o,2.1％,3.9％,4.6％,8.8％)的Ni-W-P合金镀层.利用增重法和X射线衍射法研究了Ni-W-P合金镀层的抗高温氧化性能.结果表明:磷元素的添加能显著改善Ni-W-P合金镀层的抗高温氧化性能,当磷原子分数为3.9％时,该镀层具有最佳的抗高温氧化性能,但继续增加磷含量会使其抗高温氧化性能变差;磷原子分数3.9％且保温温度低于500℃时,Ni-W-P合金镀层表面出现的彩色钝化膜能够显著抑制氧化反应;在常温下,该合金镀层为非晶态,经600℃保温处理后完全转变为晶态结构,同时出现NiO、WO2、Ni3P相.
Ni-W-P alloy coatings with high content of W and different contents of P whose atom fractions were 0,2.1％,3.9％,4.6％,8.8％,respectively,were prepared by electrolytic deposition and using phosphorous acid as phosphorous resource.The high-temperature oxidation resistance of the alloy coating was investigated using weightgain method and X-ray diffraction (XRD).The results indicate that the addition of P could improve the hightemperature oxidation resistance of the alloy coating.The alloy coating with P atom fraction of 3.9％ had the best high-temperature oxidation resistance.But the high-temperature oxidation resistance of the alloy coating decreased with the further increase of P content.When the holding temperature was below 500 ℃,and atom fraction of P was 3.9％,the color passivation film on the surface of alloy coating could restrain oxidation reaction remarkably.In addition,the alloy coating was amorphous at room temperature,but it transformed into crystal structure completely with constituent phases of NiO,WO2 and Ni3P when holding temperature was above 600 ℃.
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