电解腐蚀超细钨丝在大气环境下的氧化特性

利用扫描电镜能谱X射线衍射及力学性能分析了电解腐蚀制备的超细钨丝在大气下的氧化行为和过程。结果表明:超细钨丝在大气下氧化所得黑褐色产物应为介于WO2及WO3之间的复杂氧化物;超细钨丝在电解腐蚀后表面氧质量分数已超过1%,随后在大气下氧化,钨丝表面氧含量先升高后降低;电解腐蚀使得钨丝表面形成规则的条形纹,大气下氧化10个月后超细钨丝表面出现不规则辉纹,氧化85个月后不规则辉纹和条形纹的起伏均趋于平缓;氧化会使得钨丝断裂强度降低,但在氧化初期,延伸率变化极小,这些性质应与其氧化物具有保护性和非保护性固态氧化物的双重性质有关。

Oxidation properties of tungsten wire treated through electrochemical corrosion in air

Behavior and process of oxidization of ultra-fine tungsten wire prepared by electrochemical corrosion technology were studied using SEM photography, energy spectrum, XRD and mechanical property test. It was shown that black-brown oxidized products in the air were complex oxidates where oxygen quantivalence was between +4 and +6. Mass percent of oxygen in the surface of ultra-fine tungsten wire after electrochemical corrosion had already exceeded 1%. While the tungsten wire was oxidating in air, oxygen content in the surface of tungsten wire first increased and then decreased. Regular strips formed on the surface of W wire after electrochemical corrosion, while 10 months after oxidation, irregular striation appeared, and 85 months after fluctuation of both regular strips and irregular stria