Research On Microstructure And Performance Of Single Step Galfan Coated Steel Wire

In this study,the secondary electron microimage and backscattered electron one were done for pure zinc coating aided by chemical solution, pure zinc coating aided by electroplating, Galfan coating aided by chemical solution and Galfan coating aided by electroplating.Then line and point scan analysis, twining test were performed too.The results show:1. The pure zinc coatings aided by different technics include obvious Fe,Zn alloy transition portion and pure zinc zone.The superficial zinc of sample aided by electroplating is more compact.2. The transition portion of single step Galfan alloy is very thin,less than 1μm.And aluminum increases evidently at transition part, then stabilizes.So aluminum creates intermetalic compound firstly that holds up the Fe,Zn intermetallics.3. The combination between transition part of Galfan alloy and substrate is closer.And the superficial portion is eutectic structure,zinc sacrificing anode protection and aluminum passivation are beneficial.The addition of lanthanon improve intergranular anticorrosion.4. Neutral salt spray tests show that Galfan alloy is more anticorrosive than pure zinc and steel wire aided by electroplating is more corrosion resistant than that aided by chemical solution.Those steel wires single hot-dipped Galfan alloy do not present any lacunas after twining test.Through microstructure analysis and mechanics tests for steel wire of Germany,Xianyan ,Shanghai and 82B,the results present that single step Galfan alloy is excellent. The steel wire single hot-dipped Galfan alloy shows outstanding anticorrosion and mechanics capability. So it will be the preferred product in market.