钨合金表面腐蚀物探讨

Discussion about surface corrosives on tungsten alloys

研究针对某钨镍铜合金,牌号为93WNiCu,进行湿热试验后,按GJB150.9A湿热试验测试要求(30~60℃,湿度98%)进行处理,处理后材料表面出现的异常腐蚀物,肉眼可见表面呈现灰绿色。针对该异常腐蚀物进行表面形貌分析、截面形貌分析、元素分析等一系列研究,分析腐蚀物产生的原因及机理。结果表明:钨棒表面的附着物为基体在湿热试验过程中析出的腐蚀氧化产物,含有W、O、Ni、Cu、C等元素,该析出物呈不连续分布,厚度不均匀,观察到的腐蚀产物最大厚度约70μm。

One tungsten-nickel-copper alloy with trademark of 93WNiCu was selected for damp heat test.The sample was treated according to the requirements(30-60 C and humidity of 98%)of damp heat test in GJB150.9A.Some abnormal corrosives appeared on the material surface after treatment,and the color of gray green was visible.A series of characterizations of such abnormal corrosives were conducted,including surface morphology analysis,cross-section morphology analysis and elemental analysis,to analyze the causes and mechanisms of corrosive formation.The results showed that the attached matters on the surface of tungsten rods were the corrosion and oxidation products which were precipitated from the substrate during the damp heat test.The corrosives contained W,O,Ni,Cu,and C.The distribution of such precipitates was discontinuous and the thickness was nonuniform.The maximum thickness of the corrosion products observed was about 70μm.