镀层中Zn-Fe合金层对海洋工程用钢丝腐蚀性能的影响  

Effect of Zn-Fe alloy layer in coating on corrosion performance of steel wires for offshore engineering

作　　者：肖良辰 杨金艳 Xiao Liangchen;Yang Jinyan(Jiangsu Juli Wire Rope Co.,Ltd.,Nantong 226017,China;Nantong Products Quality Supervision and Inspection Institute,Nantong 226011,China)

机构地区：[1]江苏巨力钢绳有限公司,江苏南通226017 [2]南通市产品质量监督检验所,江苏南通226011

出　　处：《金属制品》2024年第5期21-24,39,共5页Metal Products

摘　　要：热镀锌钢丝镀层中Zn-Fe合金相组成及含量对镀层腐蚀性能影响较大。对Zn-Fe合金层形貌和厚度进行分析,结果表明:镀锌钢丝的耐腐蚀性能随合金层和纯锌层总厚度增加而增加,而Zn-Fe合金层不是越厚越好,最佳厚度6~7.5μm,此时合金层中的脆性相Γ(Fe 5Zn 21),软脆相ξ(FeZn 13)所占比例较少,合金层未出现裂纹,不存在疏松、组织粗大等现象。严格控制合金层中的锌铁元素含量比例,铁元素质量分数在纯锌层内控制在不大于1.5%,而Zn-Fe合金层的Fe元素含量最好控制在不大于8%,保证最佳相δ(FeZn 7)比例是80%~85%,此时合金层的防护性能最佳。Composition and content of Zn-Fe alloy phase in hot-dip galvanized steel wire coating have significant impact on corrosion performance of coating.Morphology and thickness of Zn-Fe alloy layer is analyzed,results show that corrosion resistance of galvanized steel wire increases with total thickness of alloy layer and pure zinc layer.While the Zn-Fe alloy layer is not the thicker the better,and the best thickness is 6~7.5μm.At this time,proportion of brittle phaseΓ(Fe 5Zn 21)and soft brittle phaseξ(FeZn 13)in alloy layer is relatively small,there are no cracks,looseness,or coarse structure in alloy layer.Strictly control proportion of zinc and iron elements in alloy layer.Mass fraction of iron elements in pure zinc layer is best controlled no more than 1.5%,while Fe element content in Zn-Fe alloy layer is best controlled no more than 8%,ensuring optimal phaseδ(FeZn 7)ratio is 80%~85%.At this time,protective performance of alloy layer is the best.

关 键 词：海洋工程 腐蚀性能 Zn-Fe合金层 镀层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]