Microstructure and Corrosion Resistance of Hot Dip Zn-Sn-Ni Alloy Coatings
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摘要: 采用SEM、极化曲线和XRD研究了在锌浴中添加Sn、Ni元素后含0.36%Si钢热浸镀锌合金镀层的组织及耐蚀性能的变化。结果表明:Zn-Sn-Ni合金浴法能够有效抑制含硅活性钢镀层的快速生长,获得厚度适宜、组织致密的镀层。Zn-Ni-Sn合金镀层在5%NaCl溶液中发生自发腐蚀的倾向小于Zn镀层,其极化电阻增大,腐蚀电流密度减小,耐蚀性能提高。合金镀层和纯锌镀层的白锈均为Zn5(OH)8Cl2·H2O与ZnO。
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关键词:
- 热浸镀锌 /
- Zn-Sn-Ni镀层 /
- 组织 /
- 耐蚀性
Abstract: In this paper,0.36% silicon-containing steels were used and the growth dynamics and microstructure of hot dip galvanized Zn-Sn-Ni(wNi ≤ 0.12%,wSn=1%) coating of those steels at 450℃ were studied in a series of galvanizing experiments and by various of testing methods such as SEM,electrochemical polarization and XRD.The results showed that the Zn-Sn-Ni alloy bath method can effectively restrain the over-growth of galvanized coatings of reactive steels and gain eligible coatings with proper thickness,and compact microstructure.The corrosion rate of Zn-Sn-Ni coating is less than that of pure zinc coating in 5% NaCl solution.Zn-Sn-Ni coating shows lower corrosion current,the increasing polarization resistance,and presents the better corrosion resistance than pure zinc coating.The corrosion products of Zn-Sn-Ni and pure zinc coating are both composed of Zn5(OH)8Cl2·H2O and ZnO.-
Key words:
- hot dip galvanizing /
- Zn-Sn-Ni coating /
- microstructure /
- corrosion resistance
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