摘要：熱浸鍍Zn-5%Al合金（Galfan）鍍層的耐蝕性是熱浸鍍純鋅層的2-3倍，且可完全阻止含硅鋼浸鍍時的硅反應性。但是由于沒有找到很好的助鍍劑，目前還不能單鍍Zn-5%Al合金的生產。本實驗就熱浸鍍Zn-5%Al合金的助鍍劑及助鍍工藝進行了研究，分析了鍍層的表面質量和鍍層的顯微組織，試圖找出一種較好的助鍍劑。

　　　實驗結果表明，使用氯化鋅和氯化銨進行助鍍時，不管兩種物質的相對含量如何變化，都不能達到很好的助鍍效果。在眾多成分中，以氯化鋅和氯化銨為1.5：1獲得的助鍍效果較好。在氯化鋅和氯化銨水溶液助鍍劑中添加氟化物也不能改善浸鍍Zn-5%Al合金的助鍍效果。而用135g/L ZnCl2、90g/L NH4Cl和90g/L SnCl2的水溶液進行助鍍的助鍍效果相對較好。但是溶液中呈乳白色，且在室溫下會有沉淀。研究發現，鋼件在Zn-5%Al合金中浸鍍30s以下時，鍍層中沒有明顯的合金層。鍍層主要由液相凝固下來形成的組織組成。而隨著浸鍍時間的延長，會在鍍層中形成Fe-Al化合物Fe2Al5和FeAl3，但形成的Fe-Al化合物層比較零亂。鍍層中沒有Zn-Fe化合物的形成。

關鍵詞:熱浸鍍，Galfan，助鍍劑，鍍層

Abstract: The corrosion resistance of hot-dip plating of Zn-5% Al alloy coating is 2-3 times than that of pure zinc layer. And it can completely suppress the silicon reactivity when galvanzing Si containing steel. However, for did not find a suitable fluxing agent, we can not individually plating of Zn-5% Al alloy production currentlly. The present work conducted research on the fluxing agents and fluxing process of hot-dip plating Zn-5% Al alloy. The surface quality of the coating and the coating microstructure were analyzed. And I am trying to find a good fluxing agent.

　　The experimental results indicated that when use ZnCl2 and NH4Cl to assisted deposition, regardless of the relative content of the two substances change, can not achieved good help plated. Among the many agent, ZnCl2 and a NH4Cl with 1.5:1 seem much better. Add fluoride in ZnCl2 and NH4Cl aqueous solution fluxing agent can not improve the assisted deposition of hot-dip plating Zn-5% Al alloy. The aqueous solution of 135g / L of ZnCl2, 90g / L of NH4Cl and 90g / L SnCl2 to assisted deposition, the assisted deposition effect is relatively good. But the solution is milky white, and there will be precipitated at room temperature. The study found that the alloy layer was not significant observed when the dip time is less than 30s. The coating mainly composed of crystals solidificated from liquid. With the increasing of the immersion time，Fe-Al the compounds, Fe2Al5 and FeAl3, will be formed in the coating. But the formation of Fe-Al compounds layer is messy. The Zn-Fe compound will not formed in the coating.

Keywords: Hot-dip galvanizing, Galfan, Fluxing agent, Coatin