建筑结构钢锌钙系磷化膜的结构与耐蚀性研究  

Investigation on Structure and Corrosion Resistance of Zinc-Calcium Phosphating Films on Building Structural Steel

作　　者：孙伟[1] 许霞[1] 张伟华[1] SUN Wei;XU Xia;ZHANG Weihua(Qingdao Huanghai University,Qingdao 266427,China)

机构地区：[1]青岛黄海学院,山东青岛266427

出　　处：《电镀与精饰》2022年第10期60-64,共5页Plating & Finishing

基　　金：青岛黄海学院校级科研项目(2020KJ04)。

摘　　要：研究了磷化时间对建筑结构钢表面锌钙系磷化膜的厚度、化学成分和耐蚀性的影响,并对锌钙系磷化膜的物相结构进行了分析。结果表明:随着磷化时间延长,磷化膜厚度逐渐增加,但达到一定限度后基本不变。在不同磷化时间下获得的6种磷化膜的化学成分均为Zn、Ca、P、O和Fe元素,Zn、Ca和P的质量分数随着磷化时间延长均呈现先升高后下降的趋势,而Fe的质量分数显著下降后基本不变。6种磷化膜的耐蚀性存在一定差异。磷化24 min获得的磷化膜厚度达到8.1μm,Zn、Ca和P的质量分数均达到最高,分别为34.78%、7.74%、17.15%,电荷转移电阻和低频区的阻抗值分别达到1937Ω·cm^(2)、1157Ω·cm^(2)。该磷化膜的主要物相为CaZn_(2)(PO_(4))_(2)·2H_(2)O,耐蚀性相对较好。The effect of phosphating time on the thickness,chemical components and corrosion resistance of zinc-calcium phosphating films on the surface of building steel was studied,and the phase structure of zinc-calcium phosphating film was also analyzed.The results showed that with the extension of phosphating time,the thickness of phosphating films increased gradually,but it remained nearly unchanged after reaching a certain limit.The chemical components of six phosphating films obtained at different phosphating time were all composed of Zn,Ca,P,O and Fe.The mass fraction of Zn,Ca and P all showed a trend of first increasing and then decreasing with the extension of phosphat‐ing time,while the mass fraction of Fe remained nearly unchanged after a significant decrease.There was a significant difference between the corrosion resistance of six phosphating films.The thickness of phosphating film obtained by phosphating for 24 min reached 8.1μm,and the mass fraction of Zn,Ca and P reached 34.78%,7.74%and 17.15%respectively.The charge transfer resistance and low frequency area impedance value reached 1937Ω·cm^(2)and 1157Ω·cm^(2),respectively.The main phase of the phosphating film was CaZn_(2)(PO_(4))_(2)·2H_(2)O,and its corrosion resistance was relatively good.

关 键 词：耐蚀性 锌钙系磷化膜 建筑结构钢 磷化时间 

分 类 号：TB43[一般工业技术]