Discussion about surface corrosives on tungsten alloys
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 ℃ 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 characteriza-tions 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 dis-continuous and the thickness was nonuniform.The maximum thickness of the corrosion products observed was about 70 μm.
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