【摘要】 对普碳钢表面热浸锌、冷镀锌和富锌涂层在青岛中港中进行了5年部分浸入腐蚀实验,对比研究了3种锌防护层耐蚀与防生物污损性能。实海腐蚀实验后进行SEM、EDS、XRD和Fourier红外分析可知,富锌板涂层边角开裂,涂层脱落,防护涂层基本失效;冷镀锌和热浸锌板在相同条件下保持着较好的阻隔性能,表面具有耐腐蚀性能的Zn分布均匀,对基底的防护性能较好,其中热浸锌效果更佳。钢板表面污损生物表征与分析结果表明,3种材料的污损过程从微型生物膜到大型污损生物群落的形成无大差别。综合比较钢板腐蚀和污损情况可知,3种锌涂层对基体的防护作用大小排序为:热浸锌>冷镀锌>富锌涂层。更多还原

【Abstract】 Hot dip galvanized-, cold galvanized-and Zn-rich coating coated-plain carbon steels were exposure in the seawater of Zhong-gang harbor at Qingdao for five years. Then the long-term immersed steels were characterized by means of EDS, XRD and FT-IR, especially in terms of the interface of seawater/steel. It follows that for the steel plate with Zn-rich coating, cracks emerged at edges and conners,and occurrence of coating falling off on the surface could be observed, which indicates that the coating has generally failed; Meanwhile, both the cold-dip galvanized and hot-dip galvanized plates maintain good barrier performance, and the elemental X-ray mapping reveals that there exist Zn of homogeneous distribution on their corroded surface, to which the better protectiveness of the two Zn galvanizing coatings may be ascribed. Among others, the hot-dip galvanizing is the best in corrosion resistance. The results of characterization for fouling organism on the surface of steel plates show that there is no significant difference in the fouling process in the formation of micro biofilm or the large fouling biological community among the three materials. Comprehensive comparison of corrosion and fouling of steel plates show that the corrosion protectiveness of the three coatings may be ranked in the order as follows: hot dip galvanizing>cold galvanizing>zinc rich coating.更多还原