热浸镀锌钢板镀层织构与耐蚀性

Texture and corrosion resistance in hot-dip galvanized steel sheet coatings

  • 摘要: 用X射线衍射和动电位扫描方法研究了热浸镀锌钢板镀层织构、相分布和耐蚀性的关系.实验结果表明,镀锌层中纯锌相的主要织构组分为0002基面织构,当镀锌层厚度增加时,纯锌相中0002基面织构密度水平增加,纯锌相自腐蚀电位升高、腐蚀电流密度减小以及耐蚀性增加.X射线衍射分析电化学剥离后的铁锌相,结果表明,镀锌层由纯锌相和合金相组成;电化学实验表明,镀锌层各相耐蚀性不同,合金相的耐蚀性高于纯锌相的耐蚀性,且Fe-Zn合金相的耐蚀性随铁含量的增加而增加.

     

    Abstract: The relationships among textures,phase distribution and corrosion resistance of hot-dip galvanized coatings were investigated with X-ray diffraction and potentiodynamic techniques.Experimental results indicate the major texture component of pure zinc phase in the galvanized coatings is 0002 basal texture.As the thickness of the galvanized coatings increases,the 0002 basal texture component as well as the free corrosion potential increases,the corrosion current density decreases,and the corrosion resistance of the galvanized coatings increase.X-ray diffraction analysis results of an electrochemical stripping Fe-Zn phase coating show that the galvanized coatings are composed of alloy phases and pure zinc phase.Electrochemical experiments indicate the corrosion resistances of alloy phases and pure zinc phase are different,the corrosion resistance of alloy phases is higher than that of pure zinc phase,and the corrosion resistance of Fe-Zn alloy phase increases with the increase of iron content.

     

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