锌-5%铝-稀土合金镀层钢丝的生产与评判

目前市场上锌 -铝 -稀土合金镀层钢丝种类繁多 ,成分不易辨别。依据锌 - 5 %铝 -稀土合金在各种锌 -铝 -稀土合金中熔点最低的特性 ,通过对比试验找出一种温度测试法 ,即将镀锌钢丝和锌 - 5 %铝 -稀土合金镀层钢丝放入已预加热至 3 90℃的电阻炉内加热 2 0min后观察钢丝表面 ,纯锌镀层钢丝表面平整但粗糙 ,呈黑灰色 ,镀层未熔化 ;锌 - 5 %铝 -稀土合金镀层钢丝表面全部呈现龟裂 ,镀层已熔化。利用这种方法能目测鉴别钢丝镀层种类。且对于经双镀法生产的锌 - 5 %铝 -稀土合金镀层钢丝 ,可根据加热至 3 90℃保温 1～ 2h后流离钢丝基体的合金质量占镀层质量的比值评判镀层的优劣。

Production and Judgment of Zn-5%Al-RE Alloy Coating Steel Wire

At present,there are many kinds of Zn-Al-RE alloy coating steel wire in the market,whose composition aren't easy to distinguish In accordance with the characteristic that the melting point of Zn-5%Al-RE alloy is the lowest in all kinds of Zn-Al-RE alloy,a temperature-testing method has been found by comparison test,which is to put Zn coating steel wires and Zn-5%Al-RE alloy coating steel wires into the electric furnace which has been heated to 390?℃,then heating 20?min Afterwards it is observed that the surface of Zn coating steel wire is smooth but rough,appears black and grey,the coat hasn't melted;and the whole surface of Zn-5%Al-RE alloy coating steel wire is full of cracks,the coat has melted By using this method,the kind of steel wire coat may be distinguished with eyes As well for Zn-5%Al-RE alloy coating steel wire produced with dual-coating method,it can judge if the coat is excellent or no by the ratio of the weight of alloy leaving wire base to the weight of coat after the steel wire has been heated to 390?℃ for 1～2?h