【摘要】 以电镀Zn–Ni合金钢为基体进行电泳涂装，以研究其涂装性能。采用电感耦合等离子体发射光谱仪（ICP）、扫描电镜（SEM）、光学轮廓仪（OP）、X射线衍射仪（XRD）和辉光放电光谱仪（GDS）分析了Zn–Ni合金镀层的化学成分、微观形貌、相结构和元素分布；通过电位-时间曲线测量，分析了Zn–Ni合金镀层磷化反应的动力学过程；根据汽车板的性能要求，检测了Zn–Ni合金镀层表面电泳漆膜的各项性能。结果表明，Zn–Ni合金镀层的Ni质量分数为12.30%，呈单一γ物相Ni₂Zn₁₁结构，但表面不够平整、致密；Zn–Ni合金镀层磷化反应的二级动力学平衡常数为2.0 m²/（g·s），平衡状态时的膜重为3.03 g/m²，决定系数为0.79，磷化膜均匀致密；电泳漆膜的附着力为0级，耐蚀性、抗石击性和耐湿性均良好。更多还原

【Abstract】 The coatability of a Zn–Ni alloy plated steel sheet was studied by electrocoating on its surface.The chemical composition,micromorphology,phase structure,and elemental distribution of the plated Zn–Ni alloy coating were analyzed by using inductively coupled plasma （ICP） optical emission spectrometer,scanning electron microscope （SEM）,optical profiler （OP）,X-ray diffractometer （XRD）,and glow discharge spectrometer （GDS）.The kinetics of phosphate film formation on Zn–Ni alloy coating was analyzed by measuring the variation of potential with time during the phosphating process.The properties of the film electrocoated on phosphated Zn–Ni alloy coating were tested.The results showed that the Zn–Ni alloy coating contained 12.30%of Ni by mass with a single phase of γ-Ni₂Zn₁₁.However its surface was not smooth or compact.The phosphating reaction on Zn–Ni alloy coating follows the second-order kinetic law with an equilibrium constant of 2.0 m²/（g·s） and a coefficient of determination as 0.79.The mass of phosphate film per unit area at the equilibrium state was calculated to be 3.03 g/m²,and the phosphate film was uniform and compact.The electrocoating formed thereon featured an adhesion of 0 grade and good resistance to corrosion,stone-chip impact,and humidity.更多还原