Performance of Galvanized Zinc and Zinc-aluminum Alloy for High Strength Steel Cables

SEM, EDS, intermittent neutral salt spray accelerated test and electrochemical test were used to compare the coating structure and corrosion resistance of hot-dip galvanized and hot-dip galvanized aluminum alloy of high-strength steel wire. The results showed that the galvanized layer was composed of pure Zn phase and Fe-Zn phase that were loose and had poor corrosion resistance. The zinc-aluminum alloy coating structure was mainly composed of Zn-Al phase and Fe-Zn-Al phase, which were uniform and dense and had good corrosion resistance. The corrosion resistance of galvanized aluminum alloy steel wire was 2-3 times better than that of galvanized steel wire. At the same time, the galvanized aluminum alloy coating still had a good protective effect on the steel wire under high stress condition.