株洲冶炼集团有限责任公司成立于2002年元月，是由始建于1956年的知名铅锌企业株洲冶炼厂整体改组改制而成的国有独资公司。公司主要生产锌、铅及其合金，综合回收铜、金、银、铋、碲、镉、铟等多种稀贵金属和硫酸，同时生产、销售5N以上的高纯镓、砷、铟、磷、锡、碲、锑、铋、硒、锌、镉等系列高纯金属产品。年产能达38万吨，其中锌28万吨，铅10万吨，销售收入32亿元，出口创汇1.6亿元。
In order to further investigate the regulation of trace alloying elements on the microstructure of coatings and the mechanism of their influence on corrosion resistance,a dual plating method was used to prepare Zn-2.0％Al-1.2％Mg-x％Sr (x=0,0.03％,0.06％,0.09％,0.12％,mass fraction) coatings on Q235 steel plates. The effects of Sr element content on the microstructure and corrosion resistance of Zn-2.0％Al-1.2％Mg coatings were examined through scanning electron microscopy (SEM),X-ray diffraction (XRD) and 5％NaCl immersion test. Results showed that adding an appropriate amount of Sr element could effectively refine the primary η-Zn phase in the solidifi-cation microstructure of the surface of Zn-2.0％Al-1.2％Mg coating,promoted the formation of a Zn/Al/MgZn2 ternary eutectic structure,and made the FeAl3-Znx columnar crystals in the intermediate alloy layer denser. Notably,when the addition amount of Sr was 0.09％,the refine-ment effect of solidification structure on the surface of the coating was most obvious,and the intermediate alloy layer was the thinnest and den-sest,at which time the coating had the lowest rate of immersion corrosion and the best corrosion resistance.
