稀土锌铝合金在热镀锌钢管上的应用

为了降低锌耗，提高热镀锌钢管的防腐性能，增加经济效益，长春钢管总厂采取了在热镀锌液中加入微量稀土锌铝合金的方法。介绍了稀土锌铝合金镀管工艺流程，合金镀管镀层均匀性检验与盐雾检验的结果，并作了经济分析。通过应用稀土锌铝合金，可改善镀层合金金属的流动性，使镀层减薄 18％～ 20％，锌耗下降 10％，耐腐蚀性能提高 1～ 2倍，吨管节锌 8.2kg。

Application of Rare-earth/Zn/Al Alloy to Processing of Hot-dip Galvanized Steel Tube

A new process concerning adding trace rare earth/Zn/Al alloy into the hot galvanizing solution is developed by Changchun Steel Tube General Plant to reduce zinc consumption and enhance corrosion resistance of the hot－ dip galvanized steel tube for greater economic benefit. The article involves main aspects of the said steel tube galvanization process with addition of rare earth/Zn/Al alloy technique, including process flow, the results of coating uniformity test and salt frog test of the alloy－ galvanized tube and relevant economic analysis. Thanks to use of the rare earth/Zn/Al alloy, the following advantages have been achieved: improved mobility of the coating alloy metal, reduction of coating thickness by 18％ － 20％ , reduction of zinc consumption by 10％ , doubled or even tripled corrosion resistance and zinc saving of 8.2 kg, per ton of tubes.